Improving rice tolerance to potassium deficiency by enhancing OsHAK16p:WOX11‐controlled root development

• DOI: 10.1111/pbi.12320
• Publication Date: 2015-01-20T11:15:43Z
• Authors: Guang Chen; Huimin Feng; Qingdi Hu; Hongye Qu; Aiqun Chen; Ling Yu; Guohua Xu
• Keywords: Tiller (botany); Lateral root; Root system; Genetically modified rice; Secondary growth

Summary Potassium (K) deficiency in plants confines root growth and decreases root‐to‐shoot ratio, thus limiting K acquisition culture medium. A WUSCHEL ‐related homeobox ( WOX ) gene, 11 , has been reported as an integrator of auxin cytokinin signalling that regulates cell proliferation. Here, we report ectopic expression gene driven by the promoter Os HAK 16 encoding a low‐K‐enhanced transporter led to extensive system adventitious roots more effective tiller numbers rice. The ‐regulated shoot phenotypes 16p: transgenic lines were supported K‐deficiency‐enhanced several RR genes type‐A cytokinin‐responsive regulators, PIN transporters Aux / IAA genes. In comparison with WT showed increases biomass, activity concentrations whole plants, higher soluble sugar particularly under low supply condition. improvement partitioning was further indicated increasing SUT 1 4 leaf blades MST s roots. Expression rice grown moderate K‐deficient soil increased total uptake 72% grain yield 24%–32%. results suggest enlarging development could provide useful option for efficiency cereal crop productivity soil.