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《2011全国植物生物学研讨会论文集》2011年
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Coordinated regulation of plant growth by gibberellins and auxin

【摘要】:正The phytohormones auxin and gibberellin(GA) cooperatively regulate many plant developmental processes.However,the molecular mechanisms underlying this crosstalk still remain unclear.Here we show that GA regulates auxin distribution and control root meristem size in the Arabidopsis.DELLA proteins interact directly with AXR3/IAA17 and SHY2/IAA3,repressors of auxin signalling,and delay auxin-mediated destabilization of AUX/IAA proteins.GA antagonizes this process via the degradation of DELLA proteins to release AUX/IAA,which in turn enhances binding of SCF~(TIR1) to AUX/IAA proteins,thereby promoting PIN activity and root gravitropism.This interaction works both ways,AUX/IAA proteins also influence GA
【分类号】:Q945

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