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Genetic and environmental control of rice tillering

作物学报:英文版 2023年第5期11卷 1287-1302页

作者： Yuping Yan Chaoqing Ding Guangheng Zhang Jiang Hu Li Zhu Dali Zeng Qian Qian Deyong Ren State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006ZhejiangChina

Increasing tiller number is a target of high-yield rice breeding. Identification of tiller-defect mutants and their corresponding genes is helpful for clarifying the molecular mechanism of rice tillering. Summarizing research progress on the two processes of rice tiller formation, namely the formation and growth of axillary meristem, this paper reviews the effects of genetic factors, endogenous hormones, and exogenous environment on rice tillering, finding that multiple molecular mechanisms and signal pathways regulating rice tillering cooperate rice tillering, and discusses future research objectives and application of its regulatory mechanism. Elucidation of theis mechanism will be helpful for breeding high-yielding rice cultivars with ideal plant type via molecular design breeding.

关键词： Rice tiller Axillary meristem tiller bud Genetic and external factors Regulatory mechanism

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Rice ZIP4 is essential for preferentially transport of zinc to new developing tissues and their development

Rice ZIP4 is essential for preferentially transport of zinc ...

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第七届长三角植物科学研讨会暨青年学术报告会

作者： Shuai Mu Le Luo Luqing Zheng College of Life Sciences Nanjing Agricultural University College of Resources and Environmental Sciences Nanjing Agricultural University

New developing tissues such as the shoot apical meristem(SAM) and the axillary meristems with low transpiration require high Zn levels for their active growth,but the molecular mechanisms underlying the preferential distribution to these tissues are poorly ***,Os ZIP4,a member of the ZIP(ZRT,IRT-like protein),showed high expression in the basal node,tiller bud and shoot SAM at the vegetative stage,but higher expression was also found in the node I at the reproductive stage of rice(Oryza sativa).Immunostaining revealed that OsZIP4 was localized at the phloem parenchyma cells and phloem transfer cells of enlarged and diffuse vascular bundles in both basal and upper *** of Os ZIP4 resulted in significant decrease in development of the tiller buds,but increase in Zn levels were observed in the shoot basal region at tillering *** only less Zn levels in the young panicles at panicle initiation(PT) stage but also in the flag leaf blade and in brown rice during the reproductive growth stage in the knockout lines as compared with the wild-type rice.A short-term experiment with the Zn stable isotope showed that more Zn was distributed to the *** short,OsZIP4 located in the node is responsible for unloading Zn from the phloem of enlarged vascular bundles,which is playing an important role in preferential distribution of zinc to the developing tissues in rice..

关键词： Zinc ZIP transporter distribution tiller bud rice

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