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干旱胁迫对赤皮青冈幼苗光合光响应特性的影响 认领

Effect of drought stress on light response characteristics of photosynthesis of Cyclobalanopsis gilva seedlings
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摘要 为阐明赤皮青冈(Cyclobalanopsis gilva)对干旱胁迫的光合响应与适应机制,以3个种源地赤皮青冈一年生幼苗为试验材料,盆栽模拟4个土壤水分梯度,测定幼苗在干旱胁迫下的光合光响应过程。结果表明,不同程度干旱胁迫下,3个种源地赤皮青冈幼苗的光响应曲线变化趋势基本一致。采用非直角双曲线模型对赤皮青冈的光响应曲线进行模拟,决定系数均在0.95以上,3个种源地赤皮青冈的光响应曲线特征参数最大净光合速率(Pnmax)、表观量子效率(AQE)和暗呼吸速率(Rd)均呈现降低的趋势。湖南洞口赤皮青冈在轻度和中度干旱下表现出一定的适应性和耐干旱能力,说明3个种源中湖南洞口种源对干旱胁迫的适应性较强。 Aiming to illustrate the photosynthetic response and adaptation mechanism of Cyclobalanopsis gilva to drought stress,simu⁃lating four soil water gradients in pot culture,the one-year-old seedlings of C.gilva from three sources were used to measure the photo⁃synthetic light responses under drought stress.The results showed that,under different drought stress treatments,the light response curves of C.gilva seedlings from three provenances were basically the same.The non-rectangular hyperbola model fit well with the light response curves of C.gilva with the determination coefficient of 0.95.With the increase of drought stress,the maximum net photo⁃synthetic rate(Pnmax),the apparent quantum yeild(AQE)and dark respiration rate(Rd)of the three provenances showed a decreasing trend.The seedlings of Dongkou provenance of Hunan province showed some adaptability and tolerance under mild and moderate drought stress,which showed that the Dongkou provenance of Hunan province had a stronger adaptability to drought stress among three provenances.
作者 吴丽君 李志辉 杨模华 李晨曦 李佳洛 李安 WU Li-jun;LI Zhi-hui;YANG Mo-hua;LI Chen-xi;LI Jia-luo;LI An(Forestry College,Central South University of Forestry and Technology,Changsha 410004,China)
出处 《湖北农业科学》 2020年第15期86-89,共4页 Hubei Agricultural Sciences
基金 湖南省教育厅科学研究项目“赤皮青冈抗旱种源筛选及抗旱生理研究”(14C1183)。
关键词 赤皮青冈(Cyclobalanopsis gilva) 干旱胁迫 光合光响应特性 Cyclobalanopsis gilva drought stress light response of photosynthesis characteristics
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