Cui Yongtao, Zhu Minhua, Song Jian, Fan Honghuan, Xu Xiaozheng, Wu Jiayan, Guo Longbiao, Wang Jianjun
Institute of Crops and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.
College of Landscape and Architecture, Zhejiang A&F University, Hangzhou, China.
Front Plant Sci. 2023 Jan 18;13:1105882. doi: 10.3389/fpls.2022.1105882. eCollection 2022.
Because of labor shortages or resource scarcity, direct seeding is the preferred method for rice (. L) cultivation, and it necessitates direct seeding at the current density. In this study, two density of direct seeding with high and normal density were selected to identify the genes involved in shade-avoidance syndrome. Phenotypic and gene expression analysis showed that densely direct seeding (DDS) causes a set of acclimation responses that either induce shade avoidance or toleration. When compared to normal direct seeding (NDS), plants cultivated by DDS exhibit constitutive shade-avoidance syndrome (SAS), in which the accompanying solar radiation drops rapidly from the middle leaf to the base leaf during flowering. Simulation of shade causes rapid reduction in phytochrome gene expression, changes in the expression of multiple or genes and photoperiod-related genes, all of which leads to early flowering and alterations in the plant architecture. Furthermore, DDS causes senescence by downregulating the expression of chloroplast synthesis-related genes throughout almost the entire stage. Our findings revealed that DDS is linked to SAS, which can be employed to breed density-tolerant rice varieties more easily and widely.
由于劳动力短缺或资源稀缺，直播是水稻（.L）种植的首选方法，并且需要以当前密度进行直播。在本研究中，选择了高密度和正常密度的两种直播密度来鉴定参与避荫综合征的基因。表型和基因表达分析表明，高密度直播（DDS）会引起一系列适应性反应，这些反应要么诱导避荫，要么诱导耐受。与正常直播（NDS）相比，通过DDS种植的植物表现出组成型避荫综合征（SAS），其中在开花期间，从中间叶片到基部叶片伴随的太阳辐射迅速下降。模拟遮荫会导致光敏色素基因表达迅速降低，多个或基因以及光周期相关基因的表达发生变化，所有这些都会导致早花和植物结构的改变。此外，DDS几乎在整个阶段通过下调叶绿体合成相关基因的表达而导致衰老。我们的研究结果表明，DDS与SAS有关，可用于更轻松、更广泛地培育耐密度水稻品种。
