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Effects of sodium benzoate on growth and physiological characteristics of wheat seedlings under compound heavy metal stress 预览 认领
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作者 LIANG Pan-pan ZHAO Chen +4 位作者 LIN Yuan GENG Ji-jia CHEN Yuan CHEN De-hua ZHANG Xiang 《农业科学学报:英文版》 SCIE CAS CSCD 2020年第4期1010-1018,共9页
In this study, we investigated the effect of exogenous sodium benzoate on wheat seedlings(Yangmai 16) grown under heavy metal stress. The results showed that 2.4 mmol kg-1 of heavy metals significantly inhibited growt... In this study, we investigated the effect of exogenous sodium benzoate on wheat seedlings(Yangmai 16) grown under heavy metal stress. The results showed that 2.4 mmol kg-1 of heavy metals significantly inhibited growth and delayed emergence of wheat seedlings. Under compound heavy metal stress, application of 2-4 g L^-1 sodium benzoate significantly increased(P<0.01) chlorophyll content and chlorophyll fluorescence parameters Fv/Fm and Fv/Fo of wheat, compared to the control(water treatment). Further analysis showed that application of 2-4 g L^-1 sodium benzoate alleviated osmotic stress by promoting the accumulation of osmolytes such as soluble proteins and free proline, increased the activity of superoxide dismutase(SOD) and reduced malondialdehyde content(MDA). In contrast, higher concentrations of sodium benzoate solution(>6 g L^-1) inhibited the growth of wheat seedlings and even caused damage to seedlings. Correlation analysis showed that when the sodium benzoate concentration was in the range of 1.97-3.12 g L^-1(2016) and 1.58-3.27 g L^-1(2017), values of chlorophyll and its components, root activity, SOD activity, soluble protein, and free proline content were the highest. When the sodium benzoate concentration was raised to 2.59 g L^-1(2016) or 3.02 g L^-1(2017), MDA content was the lowest. Ultimately, exogenous sodium benzoate(2-4 g L^-1) facilitates root development and improves the root activity of wheat seedlings grown under compound heavy metals stress, thereby effectively alleviating the damage of compound heavy metal stress in wheat seedlings. 展开更多
关键词 sodium benzoate compound heavy metals wheat seedlings physiological characteristics
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无籽西瓜精准控水免破壳育苗技术研究 预览 认领
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作者 张元国 杨晓东 +3 位作者 张秀丽 徐立功 魏家鹏 刘树森 《园艺与种苗》 CAS 2020年第2期23-25,共3页
[目的]重点从水分精准控制来研究无籽西瓜免破壳育苗技术。[方法]采用不同浇水量处理测定无籽西瓜基质育苗出苗率和发芽势。[结果]从不浇水天数来看,1 d不浇水处理发芽势和出苗率较高,分别达到45.83%和81.94%;从水量最大到最少,发芽势... [目的]重点从水分精准控制来研究无籽西瓜免破壳育苗技术。[方法]采用不同浇水量处理测定无籽西瓜基质育苗出苗率和发芽势。[结果]从不浇水天数来看,1 d不浇水处理发芽势和出苗率较高,分别达到45.83%和81.94%;从水量最大到最少,发芽势和出土率呈现先增加后降低趋势,戴帽率逐渐增加,浇透水水量减半处理发芽势和出土率最高,达到68.05%和81.94%;不同浇水量组合中浇透水水量减半处理的第2天1/6、第3天和第4天2/6的组合发芽势和出土率最高,达到70.83%和83.33%,居所有处理最高。[结论]通过控水处理探讨无籽西瓜发芽机理并为无籽西瓜免破壳提供一种可行的技术路径。 展开更多
关键词 无籽西瓜 精准控水 幼苗 免破壳
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紫娟茶自然杂交后代的ISSR分析 预览 认领
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作者 邹瑞 张玥 +2 位作者 杨自云 蓝增全 吴田 《四川农业大学学报》 CSCD 北大核心 2020年第1期87-91,共5页
【目的】为了明确紫娟茶自然杂交后的种子所萌发的实生苗与紫娟母株的遗传差异.【方法】采用28个ISSR引物对15份紫娟茶实生苗和紫娟原种基因组DNA进行PCR扩增,并采用紫外分光光度计法检测它们的花青素含量.[结果]16份紫娟茶共扩增出92条... 【目的】为了明确紫娟茶自然杂交后的种子所萌发的实生苗与紫娟母株的遗传差异.【方法】采用28个ISSR引物对15份紫娟茶实生苗和紫娟原种基因组DNA进行PCR扩增,并采用紫外分光光度计法检测它们的花青素含量.[结果]16份紫娟茶共扩增出92条DNA条带,其中多态性条带72条,占78.3%,基因多样性指数(H)为0.31,Shannon信息指数(I)为0.45,遗传相似范围在0.53~0.79之间,平均为0.66;聚类分析发现,在0.66水平上16份紫娟茶样可分为3组,SS14的遗传相似水平与紫娟原种最高,其花青素含量与紫娟原种最接近.【结论】紫娟茶的实生苗在经ISSR鉴定、花青素含量测量,且遗传相似水平较高的前提下,可以用于构建种质群;后续在利用紫娟实生苗时,可使用区分度较高的ISSR引物855进行筛选. 展开更多
关键词 茶树 实生苗 遗传多样性 Shannon信息指数 花青素含量
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植物-土壤反馈对刺五加幼苗次生代谢产物的影响 认领
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作者 金司阳 刘寒 +4 位作者 杨立学 王谦博 徐明远 李俊萍 王振月 《中国实验方剂学杂志》 CAS CSCD 北大核心 2020年第4期167-173,共7页
目的:研究植物-土壤反馈对刺五加幼苗根、茎、叶次生代谢产物的影响。方法:通过温室盆栽试验,分别对未种植过刺五加的土壤(1组),连续3年种植刺五加的土壤(2组)和多年种植刺五加的土壤(3组),分别种植刺五加1年生幼苗,并对其根、茎、叶的... 目的:研究植物-土壤反馈对刺五加幼苗根、茎、叶次生代谢产物的影响。方法:通过温室盆栽试验,分别对未种植过刺五加的土壤(1组),连续3年种植刺五加的土壤(2组)和多年种植刺五加的土壤(3组),分别种植刺五加1年生幼苗,并对其根、茎、叶的次生代谢产物进行分析。结果:L-苯丙氨酸,原儿茶酸,刺五加苷B,绿原酸,咖啡酸,刺五加苷E,异嗪皮啶,芦丁,金丝桃苷,槲皮素在多年生长刺五加土壤种植,对刺五加幼苗叶和根均有显著性差异,但在茎中绿原酸和刺五加苷E无显著性差异。其中刺五加苷E,异嗪皮啶,芦丁和金丝桃苷在多年生刺五加土壤种植的幼苗叶中未检出。在刺五加幼苗的根中,多数次生代谢产物呈现正反馈;在刺五加幼苗的茎中,咖啡酸,刺五加苷E,金丝桃苷,槲皮素呈现负反馈;在刺五加幼苗的叶中多数次生代谢产物呈现正反馈。结论:植物和土壤在刺五加幼苗生长过程不同部位呈现出不同的反馈情况,整体而言,未种植过刺五加的土壤对刺五加幼苗的次生代谢产物更具优势。研究结果为阐述植物-土壤反馈对刺五加的影响提供研究基础,并为人工栽培刺五加提供了理论依据和技术支持。 展开更多
关键词 刺五加 次生代谢 植物-土壤反馈 幼苗
Yield–density effects on growth and biomass partitioning in Leucaena leucocephala seedlings 预览 认领
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作者 Tongtong Zhou Li Xue 《林业研究:英文版》 CAS CSCD 2020年第1期175-184,共10页
Experiments were conducted to study the effects of density on growth and biomass partitioning of Leucaena leucocephala seedlings.Four plantations with densities of 10,000,20,000,40,000,and 80,000 seedlings ha^-1 were ... Experiments were conducted to study the effects of density on growth and biomass partitioning of Leucaena leucocephala seedlings.Four plantations with densities of 10,000,20,000,40,000,and 80,000 seedlings ha^-1 were evaluated only from 15 to 25 months after planting.At 15 months,crown height and width decreased with increasing density.Seedling height/dbh ratios increased with increasing density.Biomass increased with greater density according to the yield–density effect equation,which was evident for all densities.With increasing age,biomass division to branches and leaves increased,whereas partitioning to roots decreased in the 10,000 and 20,000 seedlings ha-1 plantings.Partitioning to branches and leaves remained relatively steady,while partitioning to roots increased in the 40,000 and 80,000 seedlings ha^-1 plantings.Biomass division into stem and bark components remained relatively steady in all densities.Yield–density and organ yield–density curves shifted upward with increasing seedling age on a log–log graph throughout the experimental period. 展开更多
关键词 COMPETITION LEUCAENA leucocephala SEEDLINGS Yield–density effect BIOMASS partitioning
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不同促根处理对番茄幼苗的影响 预览 认领
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作者 张元国 杨晓东 +2 位作者 张秀丽 魏家鹏 刘树森 《园艺与种苗》 CAS 2020年第1期7-8,19共3页
[目的]研究不同促根处理对番茄幼苗的影响。[方法]番茄集约化育苗采用不同促根处理,测定幼苗生长指标并计算壮苗指数。[结果]光合剂500倍液处理、壮根1号200倍处理、50 mg/L赤霉素处理有利于根的生长发育,有利于壮苗,其中光合剂500倍液... [目的]研究不同促根处理对番茄幼苗的影响。[方法]番茄集约化育苗采用不同促根处理,测定幼苗生长指标并计算壮苗指数。[结果]光合剂500倍液处理、壮根1号200倍处理、50 mg/L赤霉素处理有利于根的生长发育,有利于壮苗,其中光合剂500倍液处理最好;多孔(9孔/边)处理比正常穴盘浇水处理盘根好,生长快,增加了生物量,特别是大大促进了根的生长发育。[结论]为番茄集约化育苗促根处理培育壮苗提供理论依据。 展开更多
关键词 番茄 促根 幼苗 多孔穴盘
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不同俄罗斯种源欧洲垂枝桦播种苗的生长比较研究 预览 认领
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作者 梁立东 《林业科技》 2020年第1期19-22,共4页
以引进俄罗斯不同种源欧洲垂枝桦为材料,对其播种苗生长进行了系统比较研究。结果表明:不同种源欧洲垂枝桦播种苗生长具有极显著的差异,其地径和苗高的生长量大小依次为新西伯利亚种源>巴尔瑙尔种源>阿尔泰种源>对照种源;模糊... 以引进俄罗斯不同种源欧洲垂枝桦为材料,对其播种苗生长进行了系统比较研究。结果表明:不同种源欧洲垂枝桦播种苗生长具有极显著的差异,其地径和苗高的生长量大小依次为新西伯利亚种源>巴尔瑙尔种源>阿尔泰种源>对照种源;模糊综合评价法分析表明,不同种源欧洲垂枝桦播种苗生长量排序依次为新西伯利亚种源>巴尔瑙尔种源>阿尔泰种源>对照种源,新西伯利亚种源是不同种源欧洲垂枝桦播种苗中综合生长量最大的一个种源。 展开更多
关键词 欧洲垂枝桦 不同种源 播种苗 生长比较
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接种AM真菌对文冠果幼苗促生效应的研究 预览 认领
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作者 刘丽洁 刘平生 +2 位作者 秦强 刘涛 菅凯敏 《内蒙古林业科技》 2020年第1期34-36,共3页
在盆栽情况下,研究接种AM真菌对文冠果实生苗生长的影响。结果表明:接种丛枝菌根真菌能显著促进文冠果幼苗的生长。感染AM真菌的文冠果幼苗,侵染率、苗高、地径、分枝数等均显著提高,尤其是接种菌根土效果显著。
关键词 AM真菌 文冠果 幼苗 生长
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油菜素内酯预处理对低温胁迫下华山松幼苗生理特性的影响 预览 认领
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作者 刘良松 杨宏艳 +5 位作者 赵冬 冯峻 赵香云 罗正平 董云祥 马焕成 《西部林业科学》 CAS 北大核心 2020年第2期99-105,共7页
为揭示外源油菜素内酯(BR)对低温胁迫下华山松幼苗的抗寒机理,以华山松幼苗为材料,研究在低温(4℃)胁迫下,不同浓度:0mg/L(CK)、0.01mg/L(G1)、0.05mg/L(G2)、0.25mg/L(G3)、1.25mg/L(G4)的BR预处理对华山松幼苗生理特性的影响。结果表... 为揭示外源油菜素内酯(BR)对低温胁迫下华山松幼苗的抗寒机理,以华山松幼苗为材料,研究在低温(4℃)胁迫下,不同浓度:0mg/L(CK)、0.01mg/L(G1)、0.05mg/L(G2)、0.25mg/L(G3)、1.25mg/L(G4)的BR预处理对华山松幼苗生理特性的影响。结果表明:不同浓度的BR均可提高低温胁迫下华山松幼苗叶片的含水量和光合色素含量,提高抗氧化酶活性和渗透调节物质含量,降低丙二醛含量,且0.25mg/L的BR处理效果最佳。研究表明,外源BR能有效地缓解低温胁迫对华山松幼苗的影响,降低活性氧对其幼苗的伤害,减轻膜脂过氧化程度,提高华山松幼苗的抗寒能力。 展开更多
关键词 华山松 幼苗 低温胁迫 油菜素内酯(BR) 生理特性
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甘蔗实生苗新型培育方法 预览 认领
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作者 莫周美 秦昌鲜 +1 位作者 施泽升 唐利球 《中国糖料》 2019年第1期47-50,共4页
为提高甘蔗种子萌发率,培育茁壮实生苗,新的甘蔗实生苗培育方法采用育苗床+塘泥(含水率约90%的淤泥状基质)+沙土代替传统的育苗框+干塘泥+沙土,前期小拱棚、出苗整齐后去掉小拱棚使用塑料大棚。试验结果显示,试验组发芽率比对照组提高18... 为提高甘蔗种子萌发率,培育茁壮实生苗,新的甘蔗实生苗培育方法采用育苗床+塘泥(含水率约90%的淤泥状基质)+沙土代替传统的育苗框+干塘泥+沙土,前期小拱棚、出苗整齐后去掉小拱棚使用塑料大棚。试验结果显示,试验组发芽率比对照组提高18.57~22.53个百分点,差异显著;播种后1个月测定,试验组平均株高比对照组高4.72cm,差异显著,试验组平均茎粗比对照组粗0.99cm,试验组平均单株鲜根重比对照组增加0.083g,差异显著。新方法能够节省大量物资和劳动力成本,培育出的甘蔗实生苗农艺性状比常规方法培育出的实生苗表现更优良,植株更高、茎径更粗、根系更发达,是一种简便易行、投入较少、效果更好、能缩短育苗时间、加快育苗进程的甘蔗实生苗培育方法。 展开更多
关键词 甘蔗 实生苗 育苗方法
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不同有机水溶肥对茄子幼苗生长的影响 预览 认领
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作者 鲁荣海 向娟 +5 位作者 岁立云 吴永枚 陈玲 王波 林立金 潘绍坤 《湖北农业科学》 2019年第13期40-43,共4页
通过对茄子(SolanummelongenaL.)幼苗施用不同浓度的3种有机水溶肥(阿卡迪安海藻肥、明月泡叶藻肥和乾力氨基酸水溶肥),研究了不同有机水溶肥对茄子幼苗生长的影响。结果表明,与对照(清水)相比,合适浓度的有机水溶肥可促进茄子幼苗生长... 通过对茄子(SolanummelongenaL.)幼苗施用不同浓度的3种有机水溶肥(阿卡迪安海藻肥、明月泡叶藻肥和乾力氨基酸水溶肥),研究了不同有机水溶肥对茄子幼苗生长的影响。结果表明,与对照(清水)相比,合适浓度的有机水溶肥可促进茄子幼苗生长,提高幼苗期茄子的各项生长指标。其中以0.5g/L明月泡叶藻肥效果最好,生物量提高0.021g,径粗增加0.15mm,壮苗指数提升0.021;其次为1.0g/L乾力氨基酸水溶肥。因此,0.5g/L明月泡叶藻肥和1.0g/L乾力氨基酸水溶肥既能促进茄子幼苗生长,又能促进茄子壮苗的形成,可用于茄子育苗生产。 展开更多
关键词 茄子(SolanummelongenaL.) 幼苗 有机水溶肥 生长 壮苗
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人工补光对西瓜幼苗生长的影响 预览 认领
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作者 江姣 《中国瓜菜》 CAS 北大核心 2019年第3期34-37,46共5页
早春设施西瓜生产容易出现温度低、光照弱、湿度增加、雾霾天气等不利环境,为了在此不利条件下培育优质健壮的西瓜商品苗,试验分别设置每天补光4、8、12h3个处理,以自然光照为对照。小区分布于棚室中部,每个小区20m^2。在植株上方1m处每... 早春设施西瓜生产容易出现温度低、光照弱、湿度增加、雾霾天气等不利环境,为了在此不利条件下培育优质健壮的西瓜商品苗,试验分别设置每天补光4、8、12h3个处理,以自然光照为对照。小区分布于棚室中部,每个小区20m^2。在植株上方1m处每20m^2安置5个补光灯,补光灯根据植株的生长可以上下调整。结果表明,在早春温度低、光照弱、湿度增加、雾霾天气等不利环境条件下采用人工补光8h与12h均可满足西瓜幼苗生长需求,对幼苗生长的影响差异不大,而光照8h对于实际生产中更容易实现,为经济有效补光时间。因此,综合分析在光照不足的环境下育苗,Solar大水滴LED补光灯满足补光8h即可正常进行生产。 展开更多
关键词 西瓜 幼苗 人工补光 生长
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Tree regeneration in gap-understory mosaics in a subtropical Shorea robusta(Sal)forest 预览 认领
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作者 L.N.Sharma K.B.Shrestha I.E.Maren 《林业研究:英文版》 CAS CSCD 2019年第6期2061-2068,共8页
Spatial variation in tree-regeneration density is attributed to the specialization of tree species to light availability for germination and growth.Light availability,in turn,varies across the gap-understorey mosaic.C... Spatial variation in tree-regeneration density is attributed to the specialization of tree species to light availability for germination and growth.Light availability,in turn,varies across the gap-understorey mosaic.Canopy gaps provide an important habitat for the regeneration of tree species that would otherwise be suppressed in the understory.In subtropical forests,there is still a knowledge-gap relating to how canopy disturbances influence tree-regeneration patterns at local scale,and if they disproportionately favor regeneration of certain species.We aim to analyze whether canopy gaps promote tree regeneration,and tree species are specialized to gaps or understory for germination and growth.We sampled vegetation in 128 plots(0.01 ha),equally distributed in gaps and below canopy,in two subtropical Shorea robusta Gaertn.(Sal)forests in Nepal,recording the number of tree seedlings and saplings in each plot.We compared the regeneration density of seedlings and saplings separately between gaps and the understorey.The mean densities of seedlings and saplings were higher in the gaps at both sites;although there was no difference in the seedling density of the majority of the species between the habitats.No species were confined to either gap or understorey at the seedling stage.We conclude that gaps are not critical for the germination of tree species in Sal forests but these are an important habitat for enabling seedlings to survive into saplings.The classification of trees into regeneration guilds mainly based on germination does not apply to the majority of tree species in subtropical Sal forests.Our results reaffirm that gap creation promotes tree regeneration by favouring seedling survival and growth and can influence forest management for conservation,as well as for plantations. 展开更多
关键词 Canopy-gap Density Regeneration SAPLINGS Seedlings SHADE tolerance
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不同浓度可杀得叁仟对西瓜幼苗生长发育的影响 预览 认领
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作者 贾云鹤 《中国瓜菜》 CAS 北大核心 2019年第1期31-32,36共3页
为了明确可杀得叁仟在西瓜幼苗上的适宜施用剂量,以西瓜幼苗为试材,采用不同浓度的可杀得叁仟喷施西瓜幼苗,观察西瓜幼苗生长发育的变化。结果表明,与清水对照相比,喷施稀释 1000倍可杀得叁仟的西瓜幼苗株高、茎粗、叶面积、地上鲜质量... 为了明确可杀得叁仟在西瓜幼苗上的适宜施用剂量,以西瓜幼苗为试材,采用不同浓度的可杀得叁仟喷施西瓜幼苗,观察西瓜幼苗生长发育的变化。结果表明,与清水对照相比,喷施稀释 1000倍可杀得叁仟的西瓜幼苗株高、茎粗、叶面积、地上鲜质量、地上干质量分别提高了9.63%、28.64%、83.15%、29.33%、32.57%;根长、根鲜质量、根干质量、根呼吸速率分别比对照提高10.78%、10.38%、15.24%、15.60%。适宜浓度的可杀得叁仟能显著促进西瓜幼苗的生长,其中以可杀得叁仟(46%氢氧化铜水分散颗粒)稀释 1000倍(浓度为 4.7mmo·L^-1)处理效果最佳。 展开更多
关键词 西瓜 幼苗 可杀得叁仟 生长发育
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晚红珠樱桃实生苗果实性状遗传研究 预览 认领
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作者 李淑平 张焕春 +3 位作者 王新语 李晶 孙庆田 张福兴 《安徽农业科学》 CAS 2019年第18期46-47,51共3页
以154株晚红珠樱桃实生苗为试材,通过调查后代果实经济性状,对其遗传特性进行研究。结果表明,晚红珠樱桃实生苗果皮颜色为质量性状,红色∶黄红色为2.85 ∶1;单果重和可溶性固形物含量为数量性状,符合连续变异的遗传特点,变异范围较大,... 以154株晚红珠樱桃实生苗为试材,通过调查后代果实经济性状,对其遗传特性进行研究。结果表明,晚红珠樱桃实生苗果皮颜色为质量性状,红色∶黄红色为2.85 ∶1;单果重和可溶性固形物含量为数量性状,符合连续变异的遗传特点,变异范围较大,既能出现远小于亲本值的单株,也有大于亲本值的单株;果实的成熟期受亲本影响较大,61%表现亲本类型,26%倾向于亲本,13%出现超亲遗传。 展开更多
关键词 樱桃 实生苗 果实性状 遗传
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Effects of drought stress on the photosynthetic physiological parameters of Populus×euramericana “Neva” 预览 认领
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作者 Guoting Liang Jianwen Bu +3 位作者 Shuyong Zhang Guo Jing Guangcan Zhang Xia Liu 《林业研究:英文版》 CAS CSCD 2019年第2期409-416,共8页
Populus×euramericana“Neva”is the main poplar species in China,where drought stress is becoming extremely urgent.We carried out this research to study the effects of drought stress on the photosynthesis of Popul... Populus×euramericana“Neva”is the main poplar species in China,where drought stress is becoming extremely urgent.We carried out this research to study the effects of drought stress on the photosynthesis of Populus×euramericana“Neva”.Drought stress was induced by 58–62%(light),48–52%(moderate),and 38–42%(severe)relative soil moisture content(RSMC).The effects of drought stress on photosynthetic rate,chlorophyll fluorescence parameters,and other related physiological parameters were investigated during treatment.Net photosynthetic rate(PN),and stomatal conductance decreased significantly and intercellular CO2 concentration initially increased and then declined,whereas the stomatal limitation factors showed opposite trends in the light under moderate drought stress.PhotosystemⅡ(PSⅡ)maximum photochemical efficiency,actual photochemical efficiency,and photochemical quenching decreased gradually under drought stress,whereas nonphotochemical quenching initially increased and then declined.Superoxide dismutase,peroxidase,and catalase activities initially increased and then decreased as RSMC was reduced,whereas malondialdehyde(MDA)content and relative electric conductivity(REC)increased gradually.These results suggest that stomatal factors accounted for the decline in PN under light and moderate drought stress,whereas leaf PN decreased mainly due to non-stomatal factors under severe drought stress.PSⅡwas damaged;thus,photosynthetic electron transfer was restricted,indicating that heat dissipation is important for the light protection mechanism of plants.Antioxidant enzymes increased at the beginning of treatment,and the increased MDA and REC led to cell membrane damage.These results suggest that poplar seedlings stabilized their photosynthetic apparatus by reducing the light trapping ability under light and moderate drought stress conditions.This helped dissipate heat and enhance antioxidant enzyme activity.Stomatal factors accounted for the decline in PN,whereas damage to PSⅡand antioxidant enzymes 展开更多
关键词 POPLAR SEEDLINGS Drought stress Gas exchange CHLOROPHYLL fluorescence Antioxidantenzymes
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Outdoor Domestication Cultivation and Survival Mechanism for Tissue Culture Seedlings of Paeonia suffruticosa 预览 认领
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作者 Xianglong MA Jingxu WU +2 位作者 Yixin LIANG Shaohua LIU Yongmei WANG 《亚洲农业研究:英文版》 2019年第8期60-63,共4页
In order to reveal the differences between different peony varieties and facilities,thousands of tissue culture seedlings of 21 Itoh peony varieties imported from abroad were used as test materials,and the peony domes... In order to reveal the differences between different peony varieties and facilities,thousands of tissue culture seedlings of 21 Itoh peony varieties imported from abroad were used as test materials,and the peony domestication cultivation method used in the past was used as a control. The technical measures and mechanisms for the outdoor domestication of seedlings and the survival of field transplantation were studied. The results indicate that the main factors and measures for effectively protecting the outdoor transplanting of tissue culture seedlings include cultivating sound and strong seedlings,transplanting in proper period of spring,and providing good ventilating places and facilities,removing leaves,keeping buds and releasing dormancy before transplantation,planting depth should meet the requirement of exposing to the root neck,changing the pots according to the size of seedlings,the substrate should be loose and permeable,seriously disinfected and sterilized,scientific management,and prevention and control of diseases and insect pests. In addition,the survival mechanism was also analyzed,and the reasons and countermeasures for the successful application of peony tissue culture in China were found. Finally,the differences in survival rates between different varieties and facilities were summarized. 展开更多
关键词 Tissue culture seedlings of PAEONIA suffruticosa OUTDOOR DOMESTICATION CULTIVATION SURVIVAL rate SURVIVAL MECHANISM
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The effect of hydrogel particle size on water retention properties and availability under water stress 认领
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作者 Ahmad M.Abdallah 《国际水土保持研究(英文)》 SCIE 2019年第3期275-285,共11页
The use of superabsorbent polymers or hydrogels could increase the water holding capacity (WHC) of sandy soil and reduce water loss by deep percolation.However,hydrogels' retained water availability to plants migh... The use of superabsorbent polymers or hydrogels could increase the water holding capacity (WHC) of sandy soil and reduce water loss by deep percolation.However,hydrogels' retained water availability to plants might be overestimated without taking into consideration the hydrogel particles size.Therefore,the ultimate objective of this study was to address the impacts of hydrogel particles size on hydrogel's retained water availability (plant available water,PAW),daily water consumption (DWC) and survival of Guava seedlings subjected to drought.Moreover,some soil physical properties,i.e.,WHC,water retention properties,and hydraulic conductivity (Ksat) were investigated.Hydrogel (WaterSorb,'WS') application,particularly the WS of small particles,significantly reduced Ksat,and increased WHC and PAW.Therefore,seedlings grown in soil amended with WS fine (0.8-1.0 mm),WS medium (1.0-2.0 mm) and WS large (2-4 mm) survived for 27.0 ± 1.3,24.0 ± 1.1 and 17.0 ± 0.7 days,respectively,compared to 13.0 ± 1.0 days for the control.The water stored in the WS of large particles was less readily available for plant roots.Interestingly,hydrogels,had no effect on the DWC of the seedlings.Utilizing hydrogels as a soil amendment increases WHC PAW,growth and survival of Guava seedlings,while the effect was less pronounced for the large hydrogel particles which had lower specific surface area and swelling rate. 展开更多
关键词 WATER HOLDING capacity SWELLING rate WATER consumption Available WATER capacity SEEDLINGS survival
不同等级云南松幼苗生物量估测模型 预览 认领
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作者 李亚麒 孙继伟 +4 位作者 李建华 李伟 陈诗 许玉兰 蔡年辉 《云南大学学报:自然科学版》 CAS CSCD 北大核心 2019年第5期1073-1082,共10页
为了更简便、准确地估测云南松幼苗生物量,以幼苗的地径(D)、苗高(H)、地径与苗高的乘积(DH)、地径平方与苗高的乘积(D2H)为自变量,建立6个不同等级云南松幼苗各器官及单株生物量估测模型.通过相关系数(R)、估计值的标准误(SEE)及回归... 为了更简便、准确地估测云南松幼苗生物量,以幼苗的地径(D)、苗高(H)、地径与苗高的乘积(DH)、地径平方与苗高的乘积(D2H)为自变量,建立6个不同等级云南松幼苗各器官及单株生物量估测模型.通过相关系数(R)、估计值的标准误(SEE)及回归检验显著水平(P<0.05)筛选最优生物量估测模型.结果表明:不同等级云南松幼苗生物量最优估测模型多为幂函数,二次方程与三次方程次之;生物量最优模型最佳变量多为D2H,其中Ⅰ、Ⅵ级苗木生物量的最佳估测变量为D2H,Ⅱ、Ⅲ级苗木生物量的最佳估测变量为DH,Ⅳ级苗木生物量的最佳估测变量为DH或D2H,Ⅴ级苗木生物量的最佳估测变量为D或D2H.通过实测值与估计值的相关检验,3种最优模型均具有较好的预估精度.估算模型可较好地用于估测不同等级云南松幼苗生物量,不同等级幼苗选取的自变量和最优方程并不完全相同.因此,不能用同一种变量对6个不同等级苗木构建形式上相对统一的方程. 展开更多
关键词 云南松 幼苗 苗木分化 生物量模型
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拉萨裸裂尻大规格苗种培育技术初探 预览 认领
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作者 王金林 王且鲁 +1 位作者 曾本和 王万良 《西藏农业科技》 2019年第S01期33-35,共3页
拉萨裸裂尻是西藏主要的土著经济鱼类之一,大规格苗种的不足长期制约着拉萨裸裂尻的规模化养殖,为实现拉萨裸裂尻苗种的规模化供应,本研究提供一种拉萨裸裂尻大规格苗种的培育方法,通过控制培育条件,能使人工培育的拉萨裸裂尻苗种规格均... 拉萨裸裂尻是西藏主要的土著经济鱼类之一,大规格苗种的不足长期制约着拉萨裸裂尻的规模化养殖,为实现拉萨裸裂尻苗种的规模化供应,本研究提供一种拉萨裸裂尻大规格苗种的培育方法,通过控制培育条件,能使人工培育的拉萨裸裂尻苗种规格均匀,产量高,有利于规模化生产。 展开更多
关键词 拉萨裸裂尻 苗种 培育
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