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首页> 外文会议>International Conference on Remote Sensing, Environment and Transportation Engineering >Effects of Drought Stress and Rewatering on Photosynthetic Physiological Characteristics of Sorghum
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Effects of Drought Stress and Rewatering on Photosynthetic Physiological Characteristics of Sorghum

机译：干旱胁迫和再水对高粱光合生理特性的影响

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Water deficiency is a main limiting factor for plant growth and development in arid and semi-arid areas, it can severely affect a wide range of physiological processes, such as respiration and photosynthesis of plants. Chlorophyll fluorescence assays provide a rapid and noninvasive means to study the behavior of plant photosynthesis systems under drought stress. In the past, more attentions were paid on the growth morphological indexes of sorghum under water stress conditions, while the reports of using fluorescent technology to study photosynthetic characteristics were few in the process of continuous drought stress and rewatering, which is important to understand the adaptive mechanism of sorghum to variable water conditions. In this study, a sorghum variety (Sorghum, jinza4) was selected as the experimental material, and potted experiment was designed to study the dynamic changes of the leaf gas exchange parameters and chlorophyll fluorescence parameters in the process of different levels of drought stress: no stress (70%-80% of field capacity), medium stress (50%-60% of field capacity) and severe stress (30%-40% of field capacity) and rewatering. The results showed that: (1) With the drying of soil and prolongate of water stress, The leaf net photosynthetic rate (P_n), Stomatal conductance(G_s), intercellular CO_2 concentration(C_i), maximal efficiency of PS II (Fv/Fm), actual photochemical efficiency of PSII (ΦPS II) and photochemical quenching coefficient (qP) were gradually reduced. After the forth day of rewatering, these parameters were gradually recovered to control level; (2) The non-photochemical quenching (NPQ) of sorghum leaf under water stress conditions were higher than control in the process of drought stress and rewatering, which suggested that a part light energy absorbed by light system II was dissipated and this can protected the photosynthetic tissue, alleviate the influence of water stress on the photosynthesis; (3) Under the moderate drought condition, the reduction of P_n was mainly resulted from stomatal limitation; while for severe stress, the decreased of P_n was mainly attributed to non-stomatal factors; (4) Moderate water stress is help to enhance the single leaf water use efficiency of sorghum, and produced ultra-compensation effect in yield and water use efficiency after rewatering, severe water stress produced ultra-compensation effect in water use efficiency after rewatering.
机译：水缺乏是植物生长和开发中的主要限制因素，在干旱和半干旱地区，它可以严重影响各种生理过程，例如植物的呼吸和光合作用。叶绿素荧光测定提供了一种快速和非侵入性的方法，用于研究干旱胁迫下植物光合作用系统的行为。在过去，越来越多的关注了水分胁迫条件下支付的增长高粱的形态指标，同时采用荧光技术研究光合特性均在连续干旱胁迫及复的过程中，了解了自适应这是非常重要的少数报告高粱可变水条件的机制。在本研究中，选择了高粱品种（高粱，JinZa4）作为实验材料，设计了盆栽实验，研究了叶片气体交换参数和叶绿素荧光参数的动态变化，在不同水平的干旱胁迫下的过程中：没有压力（70％-80％的现场容量），中压（占场容50％的50％）和严重的应力（占场容量的30％-40％）和再次。结果表明：（1）随着土壤干燥及水分延长，叶净光合速率（P_N），气孔电导（G_S），细胞间CO_2浓度（C_I），PS II的最大效率（FV / FM ），PSII（φPSII）和光化学淬火系数（QP）的实际光化学效率逐渐降低。在再次水中的第四天之后，这些参数逐渐恢复到控制水平; （2）水胁迫条件下高粱叶片的非光化学猝灭（NPQ）高于干旱胁迫和再水中的控制，这表明由轻系统II吸收的部分光能被耗散，这可以保护光合组织，减轻水分胁迫对光合作用的影响; （3）在中等干旱条件下，P_N的减少主要是由气孔限制产生的;虽然对于严重的压力，但P_N的降低主要归因于非气孔因素; （4）中等水分胁迫有助于提高高粱的单叶水使用效率，并在再水中产生超补偿效果和水利用效率，重新水后，严重的水胁迫在水使用效率产生超补偿效果。

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