Brevis plant1, a putative inositol polyphosphate 5-phosphatase, is required for internode elongation in maize

Journal of Experimental Botany
Luis M AvilaLewis Lukens

Abstract

In maize (Zea mays L.), as in other grass species, stem elongation occurs during growth and most noticeably upon the transition to flowering. Genes that reduce stem elongation have been important to reduce stem breakage, or lodging. Stem elongation has been mediated by dwarf and brachytic/brevis plant mutants that affect giberellic acid and auxin pathways, respectively. Maize brevis plant1 (bv1) mutants, first identified over 80 years ago, strongly resemble brachytic2 mutants that have shortened internodes, short internode cells, and are deficient in auxin transport. Here, we characterized two novel bv1 maize mutants. We found that an inositol polyphosphate 5-phosphatase orthologue of the rice gene dwarf50 was the molecular basis for the bv1 phenotype, implicating auxin-mediated inositol polyphosphate and/or phosphoinositide signalling in stem elongation. We suggest that auxin-mediated internode elongation involves processes that also contribute to stem gravitropism. Genes misregulated in bv1 mutants included genes important for cell wall synthesis, transmembrane transport, and cytoskeletal function. Mutant and wild-type plants were indistinguishable early in development, responded similarly to changes in light quality, had una...Continue Reading

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Citations

Sep 15, 2016·Development·Jyotirmaya MathanAashish Ranjan
Oct 16, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Xiaomeng ShenZuxin Zhang
Nov 7, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Hongmei MiaoHaiyang Zhang

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