The outstanding rooting1 mutation gene maintains shoot growth and grain yield through promoting root development in rice under water deficit field environments
The outstanding rooting1 mutation gene maintains shoot growth and grain yield through promoting root development in rice under water deficit field environments
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优秀的rooting1突变基因通过促进水稻在缺水田间环境下的根部发育来维持地上部生长和产量
DOI：
10.1111/jac.12524
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发表时间：
2021
影响因子：
3.5
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Hasegawa;T.;Wainaina;C. M.;Shibata;A.;Lucob-Agustin;N.;Makihara;D.;Kikuta;M.;Menge;D. M.;Gichuhi;E. W.;Samejima;H.;Kano-Nakata;M.;Kimani;J. M.;Musila;R. N.;Yamauchi;A. and Inukai;Y.
干旱是水稻种植最严重的制约因素之一，即使在交替湿润和干燥（AWD）下，这是一种节水管理实践。在水稻中，增强的根系发育对于水分亏缺环境下的稳定的芽生长、适应性和生产力是必不可少的。我们用水培方法鉴定并鉴定了一个突出的生根突变体。本研究旨在研究突变体的根系形态特征以及突变基因在AWD条件下地上部生长和产量中的作用。因此，我们在肯尼亚的盆栽试验和田间AWD条件下评估了我们的1号水稻突变体的生长表现。在AWD和连续淹水（CWL）条件下，对突变体、野生型及其后代进行了试验。我们的1突变体具有发达的根系，并表现出特别增强的细根发育，这是保持从早期营养阶段通过生殖阶段在盆栽和田间AWD管理。这种增强的根系发育促进了地上部的生长，通过增加水分的吸收，在干旱期间之间的复水条件在AWD。另外，突变体1在生殖生长期表现出较高的地上部生长量，从而在AWD条件下保持了产量。与野生型基因型相比，携带gour1突变基因的基因型表现出更高的产量，这归因于根系活性增强导致其更高的光合能力。这些结果表明，在水分有限的环境下，发达的根系结构和增强的根系功能在稳定水稻产量方面发挥着重要作用。我们的研究结果表明，our1突变基因可以作为一种新的育种材料，以减轻短暂的干旱胁迫对产量的影响下，AWD。
Drought is one of the most serious constraints to rice cultivation, even under alternate wetting and drying (AWD), which is a water‐saving management practice. In rice, enhanced root development is essential for stable shoot growth, adaptability and productivity under water deficit environments. We identified and characterizedoutstanding rooting1(our1) rice mutant using hydroponics. The present study sought to examine morphological root traits of theour1mutant and the role of the mutation gene in shoot growth and yield under AWD. Thus, we evaluated the growth performance of theour1rice mutant in pot experiments and under field AWD conditions in Kenya. The experiments were conducted withour1mutant, its wild type and their progenies under both AWD and continuously waterlogged (CWL) conditions. Theour1mutant possessed a well‐developed root system and exhibited particularly enhanced thin root development, which was maintained from the early vegetative stage through the reproductive stage under both pot and field AWD management. This enhanced root development promoted shoot growth through increased water uptake during rewatered conditions between drought periods in AWD. In addition, theour1mutant showed enhanced shoot growth during the reproductive stage, resulting in the maintenance of yield under AWD fields. Genotypes harbouringour1mutation gene showed higher yields compared to wild‐type genotypes which was attributed to their higher photosynthetic ability as a result of enhanced root activity. These results suggest the important role of a well‐developed root system architecture and enhanced root function in stabilizing rice yields under water‐limited environments. Our findings indicate that theour1mutation gene can serve as a novel breeding material to mitigate the impact of transient drought stress on yield under AWD.