ABI1 regulates carbon/nitrogen-nutrient signal transduction independent of ABA biosynthesis and canonical ABA signalling pathways in Arabidopsis

Journal of Experimental Botany
Yu LuJunji Yamaguchi

Abstract

Plants are able to sense and mediate the balance between carbon (C) and nitrogen (N) nutrient availability to optimize metabolism and growth, described as the C/N response. To clarify the C/N signalling mechanism, C/N-insensitive plants were obtained from an Arabidopsis FOX hunting population, which over-expresses full-length cDNAs for individuals. The resulting cni2-D (carbon/nitrogen insensitive 2-dominant) plant was found to overcome the post-germination growth checkpoint and to expand green cotyledons in disrupted high C/low N stress conditions. The CNI2 gene encodes ABI1, a phosphatase type 2C protein, which negatively regulates abscisic acid (ABA) signal transduction. Over-expressors of ABI1 were found to be insensitive to disrupted C/N stress, whereas the loss-of function mutant abi1-2 was hypersensitive, suggesting that ABI1 plays an essential role in the plant C/N response. By contrast, the C/N-dependent growth phenotype observed in wild-type plants was not associated with endogenous ABA content. Accordingly, the ABA-insensitive mutant abi1-1, which could not bind to the ABA-ABA receptor complex, was not insensitive and restored normal sensitivity to high C/low N stress. The canonical ABA signalling mutants abi4 and ab...Continue Reading

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Citations

Dec 5, 2015·Frontiers in Plant Science·Daniel OsunaMiguel Aguilar
Apr 8, 2016·Journal of Experimental Botany·Przemyslaw KmiecikMarkus Teige
Jan 13, 2019·International Journal of Molecular Sciences·Muhammad Asad Ullah AsadFangmin Cheng
Jan 17, 2019·International Journal of Molecular Sciences·Tengfei LiuBotao Song
Jan 26, 2021·Plant Science : an International Journal of Experimental Plant Biology·Yimeng LiMasami Yokota Hirai

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Methods Mentioned

BETA
transgenic
PCR
ubiquitination

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