Regulation of ammonium-mediated inhibition of root system development via local and systemic pathways
作者单位：Department of Biological SciencesUniversity of Toronto1265 Military TrailTorontoOntarioM1C 1A4Canada
会议名称：《从植物科学到农业发展——2012全国植物生物学大会》
会议日期：2012年
学科分类：09[农学] 0903[农学-农业资源与环境]
关 键 词：Ammonium AUX1 VTC1 root system development
摘 要：The formation of root system architecture is greatly dependent on the environmental conditions such as ***(NH) is an important nitrogen source for higher ***,excess NH shows a strong suppression on root system development. Here,with local nutrition supply device,we revealed that NH-mediated inhibition of root elongation is primarily through root tip,whereas NH-mediated reduction of lateral root number is a result of shoot contact with ***,NH inhibition of root growth was shown to target primarily cell elongation,which was directly linked to excessive NH efflux in the root elongation zone,but not related to auxin *** NH efflux is regulated by GDP-mannose pyrophosphorylase(GMPase).On the other hand, NH-induced reduction of lateral root formation results from less lateral root emergence rather than lateral root initiation,which is caused by the decreased transport of shoot-derived auxin to roots,via the auxin influx carrier *** together,these results suggest regulations of primary root elongation and lateral root formation by NH is through local and systemic two independent *** findings provide a novel insight to regulations of root development by environmental nutrient factors.