Publications of NIPGR Scientists

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Author: search.filters.author.Pandey, Bipin K.Subject: search.filters.subject.phosphate

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    Rice actin binding protein RMD controls crown root angle in response to external phosphate
    (Springer Nature, 2018) Huang, Guoqiang; Liang, Wanqi; Sturrock, Craig J.; Pandey, Bipin K.; Giri, Jitender; Mairhofer, Stefan; Wang, Daoyang; Muller, Lukas; Tan, Hexin; York, Larry M.; Yang, Jing; Song, Yu; Kim, Yu-Jin; Qiao, Yang; Xu, Jian; Kepinski, Stefan; Bennett, Malcolm J.; Zhang, Dabing
    Root angle has a major impact on acquisition of nutrients like phosphate that accumulate in topsoil and in many species; low phosphate induces shallower root growth as an adaptive response. Identifying genes and mechanisms controlling root angle is therefore of paramount importance to plant breeding. Here we show that the actin-binding protein Rice Morphology Determinant (RMD) controls root growth angle by linking actin filaments and gravity-sensing organelles termed statoliths. RMD is upregulated in response to low external phosphate and mutants lacking of RMD have steeper crown root growth angles that are unresponsive to phosphate levels. RMD protein localizes to the surface of statoliths, and rmd mutants exhibit faster gravitropic response owing to more rapid statoliths movement. We conclude that adaptive changes to root angle in response to external phosphate availability are RMD dependent, providing a potential target for breeders.
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    Comparative morphophysiological analyses and molecular profiling reveal Pi-efficient strategies of a traditional rice genotype
    (Frontiers Media S.A., 2016) Mehra, Poonam; Pandey, Bipin K.; Giri, Jitender
    Phosphate (Pi) deficiency severely affects crop yield. Modern high yielding rice genotypes are sensitive to Pi deficiency whereas traditional rice genotypes are naturally compatible with low Pi ecosystems. However, the underlying molecular mechanisms for low Pi tolerance in traditional genotypes remain largely elusive. To delineate the molecular mechanisms for low Pi tolerance, two contrasting rice genotypes, Dular (low Pi tolerant), and PB1 (low Pi sensitive), have been selected. Comparative morphophysiological, global transcriptome and lipidome analyses of root and shoot tissues of both genotypes grown under Pi deficient and sufficient conditions revealed potential low Pi tolerance mechanisms of the traditional genotype. Most of the genes associated with enhanced internal Pi utilization (phospholipid remobilization) and modulation of root system architecture (RSA) were highly induced in the traditional rice genotype, Dular. Higher reserves of phospholipids and greater accumulation of galactolipids under low Pi in Dular indicated it has more efficient Pi utilization. Furthermore, Dular also maintained greater root growth than PB1 under low Pi, resulting in larger root surface area due to increased lateral root density and root hair length. Genes involved in enhanced low Pi tolerance of the traditional genotype can be exploited to improve the low Pi tolerance of modern high yielding rice cultivars.