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首页> 外文会议>2016 IEEE International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications >Stress-induced DREB1A gene changes heliotropism and reduces drought stress in soybean plants under greenhouse conditions
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Stress-induced DREB1A gene changes heliotropism and reduces drought stress in soybean plants under greenhouse conditions

机译：在温室条件下，胁迫诱导的DREB1A基因改变大豆各向同性并减少干旱胁迫

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The drought stress is one of the most severe environmental constraints for plant and food production. Development of cultivars for suitable drought environments can offer sustainable solutions. In order to avoid direct sunlight under drought conditions, some species show complex daily heliotropic adjustments of leaf angles that can reduce transpiration losses by diminishing the light interception (paraheliotropism). The diaheliotropism (solar tracking) is an opposite process that can increase diurnal carbon gain in sparse canopies and reduce carbon gain in dense canopies. A soybean cultivar BR 16 was genetically engineered producing the isoline P58 with intention to ectopically over express AtDREB1A, a transcription factor known to be involved in a biotic stress response. It was hypostatized that P58 will show better tolerance to drought stress compared to parental cultivar BR 16. The aim of the study was to follow the central and lateral leaflet movements in vegetative stages V7-V10 and to integrate heliotropic changes of BR 16 and P58 into an estimation of daily plant photosynthesis using 3D modelling. Soybean plants were grown in greenhouse, under optimized water supply and drought stress controlled by gravimetric humidity in pots. The plants were codified and reconstructed under the VPlants methodology. Leaflet movements and leaf gas exchange were measured in V7-V10 stages on leaflets of upper leaves by hourly-performed photo-shots and reproduced in 3D reconstructions. Under non-limited conditions, the BR 16 showed some diaheliotropic movements of the central and lateral leaflets, in the morning and early afternoon hours, while the central leaflet in P58 showed long lasting diaheliotropic movements in the morning and early afternoon with lateral leaflets constantly positioned parallel to solar rays. Under the drought stress, BR 16 responded by prevalent paraheliotropic movements of the central and lateral leaflets, while the central leaflets in P58 followed the paraheliotropic pattern, and the lateral ones showed diaheliotropic movements in the morning, early afternoon and late afternoon compensating the predominant central leaflet paraheliotropism. The mean leaf photosynthesis per plant in water-stressed P58 was maintained in the same level as in well-watered plants during the late morning hours. Results suggest that DREB1A could be involved in various responses to drought stress, from alleviating its impacts through the increasing of diaheliotropic movement frequency of lateral leaflets, to maintaining the same level of assimilation in late morning hours on plant scale.
机译：干旱胁迫是植物和粮食生产最严重的环境限制之一。开发适合干旱条件的品种可以提供可持续的解决方案。为了避免干旱条件下的直射阳光，一些物种每天都会对叶片角度进行复杂的日变向性调节，从而可以通过减少光的截留来减少蒸腾作用的损失（亲油性）。透液性（太阳跟踪）是一个相反的过程，可以增加稀疏冠层的日增碳量，并减少稠密冠层的增碳量。对大豆品种BR 16进行了基因工程改造，以产生等位基因P58，旨在异位过表达AtDREB1A（一种已知参与生物胁迫响应的转录因子）。据推测，与亲本品种BR 16相比，P58对干旱胁迫表现出更好的耐受性。该研究的目的是追踪营养期V7-V10的中央和侧面小叶运动，并将BR 16和P58的日光性变化纳入使用3D建模估算植物的日常光合作用。大豆植物在温室中生长，在优化的供水条件下，并通过盆中的重量湿度控制干旱胁迫。使用VPlants方法对植物进行编码和重建。通过每小时执行一次的照片拍摄，在上层叶片的小叶上以V7-V10阶段测量小叶运动和叶片气体交换，并在3D重建中进行复制。在非限制性条件下，BR 16在早晨和下午早些时候表现出中央和外侧小叶的透液性运动，而P58的中央小叶在早晨和下午的清晨和清液性运动中表现出持久的透液性，并且侧叶不断固定与太阳光线平行。在干旱胁迫下，BR 16通过中央和外侧小叶的普遍副向亲热运动做出响应，而P58中的中央小叶遵循副抗小风的模式，而外侧小叶则在早上，下午和下午晚些时候出现了透风运动，从而补偿了主要的中央小叶副嗜性。在傍晚时分，水分胁迫的P58中每株植物的平均叶片光合作用保持在与水分充足的植物相同的水平。结果表明，DREB1A可能参与了多种干旱胁迫响应，从减轻其影响（通过增加侧叶的变径运动频率）到维持植物规模的清晨同化水平。

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