解码水稻基因型在叶片和植株尺度上调节水分利用效率的气孔特征。

IF 3.6 3区 生物学 Q1 PLANT SCIENCES
Planta Pub Date : 2024-07-22 DOI:10.1007/s00425-024-04488-x
Abhishree Ramachandra, Preethi Vijayaraghavareddy, Chaitanya Purushothama, Spoorthi Nagaraju, Sheshshayee Sreeman
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引用次数: 0

摘要

主要结论水稻基因型的气孔特征影响水分利用效率。低频小尺寸气孔与整个植株的效率相关,而低频大尺寸气孔则表现出内在效率和对蒸汽压力不足的响应性。叶片表面和表皮层的形态对植物生长起着至关重要的作用。叶面有助于决定辐射截获,而气孔因子的表皮模式则强烈调节气体交换和水分利用效率(WUE)。本研究的重点是识别水稻基因型的不同气孔特征,以了解它们对水分利用效率的影响。在 150 个水稻种质中,气孔频率在每平方毫米 353 到 687 个之间,大小在 128.31 到 339.01 μm2 之间,背面和正面的差异显著。在室外表型组学平台上测定的作物整个生长期以及一天 24 小时中特定时段的累积蒸腾水分和 WUE 与气孔频率和大小无关。然而,气孔频率低、尺寸大的基因型的内在水分利用效率更高(67.04 μmol CO2 mol-1 H2O),并且对昼夜范围在 0.03 至 2.17 kPa 之间的不同蒸汽压力损失的反应更快。该研究表明,在单叶和整株水平上,气孔因子在决定 WUE 的生理亚组分中都发挥了作用。对比组间气孔调控基因表达模式的差异解释了表皮形态的变化。在低气孔频率基因型中,ERECTA、TMM 和 YODA 基因表达的增加似乎导致了气孔频率的降低。这些发现强调了气孔性状在育种计划中的重要性,并有力地支持了这些控制气孔结构变异的基因在未来作物改良计划中的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Decoding stomatal characteristics regulating water use efficiency at leaf and plant scales in rice genotypes.

Decoding stomatal characteristics regulating water use efficiency at leaf and plant scales in rice genotypes.

Main conclusion: Stomatal traits in rice genotypes affect water use efficiency. Low-frequency small-size stomata correlate with whole plant efficiency, while low-frequency large-size stomata show intrinsic efficiency and responsiveness to vapour pressure deficit. Leaf surface and the patterning of the epidermal layer play a vital role in determining plant growth. While the surface helps in determining radiation interception, epidermal pattern of stomatal factors strongly regulate gas exchange and water use efficiency (WUE). This study focuses on identifying distinct stomatal traits among rice genotypes to comprehend their influence on WUE. Stomatal frequency ranged from 353 to 687 per mm2 and the size varied between 128.31 and 339.01 μm2 among 150 rice germplasm with significant variability in abaxial and adaxial surfaces. The cumulative water transpired and WUE determined at the outdoor phenomics platform, over the entire crop growth period as well as during specific hours of a 24 h-day did not correlate with stomatal frequency nor size. However, genotypes with low-frequency and large-size stomata recorded higher intrinsic water use efficiency (67.04 μmol CO2 mol-1 H2O) and showed a quicker response to varying vapour pressure deficit that diurnally ranged between 0.03 and 2.17 kPa. The study demonstrated the role of stomatal factors in determining physiological subcomponents of WUE both at single leaf and whole plant levels. Differential expression patterns of stomatal regulatory genes among the contrasting groups explained variations in the epidermal patterning. Increased expression of ERECTA, TMM and YODA genes appear to contribute to decreased stomatal frequency in low stomatal frequency genotypes. These findings underscore the significance of stomatal traits in breeding programs and strongly support the importance of these genes that govern variability in stomatal architecture in future crop improvement programs.

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来源期刊
Planta
Planta 生物-植物科学
CiteScore
7.20
自引率
2.30%
发文量
217
审稿时长
2.3 months
期刊介绍: Planta publishes timely and substantial articles on all aspects of plant biology. We welcome original research papers on any plant species. Areas of interest include biochemistry, bioenergy, biotechnology, cell biology, development, ecological and environmental physiology, growth, metabolism, morphogenesis, molecular biology, new methods, physiology, plant-microbe interactions, structural biology, and systems biology.
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