期刊文献+

根系深度对旱后复水玉米补偿性生长的影响

Effects of root depth on compensatory growth of corn seedlings during post-drought re-watering
收藏 分享 导出
摘要 基于根系诱导的细胞分裂素对玉米生长的影响,本研究探讨了根系深度与旱后复水玉米(Zea mays)补偿性生长的关系。以苗期玉米为试验材料,从4月20日—6月3日,设置充分供水、充分供水且断根、旱后复水、旱后复水且断根4个处理。在玉米干旱胁迫结束时,即出苗后第28天对其进行断根处理,用薄背刀在盆纵向的中间位置水平横切,使根系完全断为两半以得到浅根系。结果表明:与充分供水相比,干旱抑制玉米生长,使其地上生物量、根系生物量与总生物量大幅下降;未断根条件下,复水后,根系能感知水分刺激产生细胞分裂素,且细胞分裂素会经由伤流液转运至玉米叶片;叶片中细胞分裂素含量水平的增加能促进其净光合速率的提高,并可使玉米地上生物量、根系生物量与总生物量增加,进而促进玉米复水后的较快生长;而断根条件下,深根被去除,复水后,浅根虽能感受水分刺激,但并不能产生大量细胞分裂素,进而导致叶片中细胞分裂素含量不能明显升高,净光合速率也不能明显增加,各部分生物量增加亦不明显,玉米不能够快速生长。总之,根系诱导的叶片细胞分裂素是旱后复水玉米补偿性生长的核心因素;而断根使得深根大量丧失,复水后玉米浅根系不易产生细胞分裂素,从而不能引起补偿性生长,即深根对玉米的旱后复水玉米补偿性生长起着关键性作用。 We explored the relationship between root depth and compensatory growth of corn seedlings during post-drought re-watering from April 20 to June 3, on the basis of leaf cytokinin induced by roots. Four treatments including wetness, wetness with root cutting, re-watering, and re-watering with root cutting were set up. At the end of drought stress period (28 days after seed- ling emergence), root cutting was halves by horizontal cross in the Compared with wetness treatment, conducted to remove deep roots as cutting root system into two middle position of pot longitudinal section with a thin knife. drought stress inhibited corn growth by decreasing biomass of the whole plant. Re-watering induced roots to produce cytokinin in the absence of root cutting, which was then transported to leaves through the xylem sap. The enhanced cytokinin in leaves increased net photosynthetic rate and biomass of the whole plant. As a result, faster growth occurred in corns during post-drought re-watering without root cutting. Under root cutting, although stimulated by re-watering, the shallow roots could not induce high-level production of cytokinin. We found no changes of cytokinin content and net photosynthetic rate in leaves under root cutting treatments. The biomass of whole plant did not increase rapidly, and no rapid growth occurred in corn with root cutting. In summary, root-induced cytokinin is a key factor in corn compensatory growth during post-drought re-watering. Root cutting leads to the loss of deep roots, and shallow roots of corn hardly produce cytokinin, which cannot result in compensatory growth.Our results showed that deep roots play a key role in the compensatory growth of corn during postdrought re-watering.
作者 秦荣荣 王晓凌 QIN Rong-rong, WANG Xiao-ling (College of Agronomy, Henan University of Science and Technology, Luoyang 471003, Henan, China)
出处 《生态学杂志》 CSCD 北大核心 2018年第11期3291-3297,共7页 Chinese Journal of Ecology
基金 河南省科技创新杰出青年基金(174100510004)、国家自然科学基金(U1304326)和河南科技大学学科提升振兴A计划项目(13660001)资助.
关键词 玉米幼苗 断根处理 根系深度 细胞分裂素 旱后复水 补偿性生长 corn seedling root cutting root depth cytokinin post-drought re-watering com-pensatory growth
作者简介 秦荣荣,女,1991年生,硕士研究生,主要从事植物生理生态学研究。E-mail:rrqin0104@163.com;通讯作者E-mail:wxling02@163.com
  • 相关文献

参考文献27

二级参考文献569

共引文献388

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈