当前位置: X-MOL 学术Agric. Water Manag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Stomatal limitations to photosynthesis and their critical Water conditions in different growth stages of maize under water stress
Agricultural Water Management ( IF 6.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.agwat.2020.106330
Xingyang Song , Guangsheng Zhou , Qijing He , Huailin Zhou

Abstract Stomata are the channels by which plants exchange water vapor and carbon dioxide with the environment. Clarifying the change from stomatal limitations (SL) to non-stomatal limitations (NSL) of photosynthesis and their critical conditions is vital for accurately recognizing the degree of crop drought and formulating countermeasures. A field experiment was carried out from 2013 to 2015 to study the critical water conditions when maize photosynthesis changed from being limited by SL to NSL in different leaf positions under different degrees of water stress in different growth stages (3rd leaf stage, 7th leaf stage and jointing stage). Our results indicated that photosynthesis of maize leaves at different positions changed from being determined by SL to NSL under different water stress levels at different growth stages; moreover, maize photosynthesis changed from being directed by SL to NSL in the first fully expanded leaf at the top before the changes occurred in the third leaf. The effect of water stress during different growth stages on the maize leaf water content (LWC) at which photosynthesis changed from being limited by SL to NSL was not distinct. The changing point of SL at different leaf positions was closely related to the LWC, and the LWC at the changing point of SL was different at different leaf positions, which indicated that the change in SL is mainly determined by the leaf position and LWC, and its occurrence showed a decreasing trend from plant top to bottom. The LWC at which the SL transformation point occurred in the first fully expanded leaf at the top (75.5 % ± 1.5 %–75.7 % ± 1.3 %) was higher than that at which the change occurred in the third leaf at the top (73.2 % ± 1.1 %–73.4 % ± 1.6 %). The phenomenon of photosynthesis changing from being limited by SL to NSL occurred first in the first fully expanded leaf at the top; additionally, the LWC of the first fully expanded leaf at the top was the best indicator in maize under water stress and could be used as the critical condition marking the transformation of maize damage from water stress to damage from plant physiological and ecological stress. These results could provide a basis for the identification of crop drought disasters and their classification and provide a methodological reference for the identification and monitoring of drought in other crops.

中文翻译:

水分胁迫下玉米不同生育阶段光合作用的气孔限制及其临界水分条件

摘要 气孔是植物与环境交换水蒸气和二氧化碳的通道。阐明光合作用从气孔限制(SL)到非气孔限制(NSL)的变化及其临界条件对于准确识别作物干旱程度和制定对策至关重要。2013-2015年进行田间试验,研究了不同生长阶段(第3叶期、第7叶期和第7叶期)在不同程度水分胁迫下,不同叶位的玉米光合作用从受SL限制变为NSL的临界水分条件。接合阶段)。我们的研究结果表明,在不同生长阶段不同水分胁迫水平下,不同位置的玉米叶片光合作用由SL决定转变为NSL决定;而且,在第三片叶子发生变化之前,玉米光合作用在顶部的第一个完全展开的叶子中从由 SL 引导变为 NSL。不同生长阶段水分胁迫对光合作用从受SL限制转变为NSL限制的玉米叶片含水量(LWC)的影响不明显。不同叶位SL变化点与LWC密切相关,不同叶位SL变化点LWC不同,说明SL变化主要由叶位和LWC决定,其发生率自上而下呈递减趋势。SL 转变点出现在顶部第一个完全展开的叶子中的 LWC (75.5 % ± 1.5 %–75.7 % ± 1. 3 %) 高于顶部第三片叶子发生变化时的变化 (73.2 % ± 1.1 %–73.4 % ± 1.6 %)。光合作用由受SL限制转变为NSL的现象首先发生在顶部的第一个完全展开的叶片上;此外,顶部第一个完全展开叶片的LWC是水分胁迫下玉米的最佳指标,可作为玉米从水分胁迫损害向植物生理生态胁迫损害转变的临界条件。这些结果可为作物干旱灾害的识别和分类提供依据,为其他作物干旱的识别和监测提供方法学参考。光合作用由受SL限制转变为NSL的现象首先发生在顶部的第一个完全展开的叶片上;此外,顶部第一个完全展开叶片的LWC是水分胁迫下玉米的最佳指标,可作为玉米从水分胁迫损害向植物生理生态胁迫损害转变的临界条件。这些结果可为作物干旱灾害的识别和分类提供依据,为其他作物干旱的识别和监测提供方法学参考。光合作用由受SL限制转变为NSL的现象首先发生在顶部的第一个完全展开的叶片上;此外,顶部第一个完全展开叶片的LWC是水分胁迫下玉米的最佳指标,可作为玉米从水分胁迫损害向植物生理生态胁迫损害转变的临界条件。这些结果可为作物干旱灾害的识别和分类提供依据,为其他作物干旱的识别和监测提供方法学参考。顶部第一个完全展开叶片的LWC是水分胁迫下玉米的最佳指标,可作为玉米从水分胁迫损害向植物生理生态胁迫损害转变的临界条件。这些结果可为作物干旱灾害的识别和分类提供依据,为其他作物干旱的识别和监测提供方法学参考。顶部第一个完全展开叶片的LWC是水分胁迫下玉米的最佳指标,可作为玉米从水分胁迫损害向植物生理生态胁迫损害转变的临界条件。这些结果可为作物干旱灾害的识别和分类提供依据,为其他作物干旱的识别和监测提供方法学参考。
更新日期:2020-11-01
down
wechat
bug