水稻冠根数目多样性与生长素的关系  

Auxin and genetic diversity of crown root number in rice

作　　者：陈雅[1] 包亮[1] 王利凯[1] 赵磊[1] 余四斌[1] 须健[1] 

机构地区：[1]华中农业大学作物遗传改良国家重点实验室,武汉430070

出　　处：《华中农业大学学报》2012年第4期410-413,共4页Journal of Huazhong Agricultural University

基　　金：国家基础科学与人才培养基金项目(J0730649);华中农业大学科研启动费(52204-00701)

摘　　要：采用改进的水稻根系鉴定体系考察42个生态型水稻的冠根数目,发现水稻冠根数目存在多样性;从中选择2个冠根数目极端多和2个冠根数目极端少的生态型,利用定点施加生长素极性运输抑制剂NPA,以冠根数目为指标,分析冠根数目不同的生态型对NPA的敏感性,发现NPA处理导致冠根数目减少。在低浓度NPA处理时,冠根数目多的品种比冠根数目少的品种对NPA更敏感;在高浓度NPA处理时,不同生态型水稻冠根数目趋于接近。说明在不同根系类型的水稻中,生长素对冠根数目都有着重要的影响。Using an improved rice root research system, crown root numbers in 42 cultivated rice were analyzed. Results showed that different eultivars have different crown root numbers, ranging from 2 to 12 at average. Two cultivars with extremely few crown roots and 2 cultivars with large numbers of crown roots were selected for further analysis with the polar auxin transport inhibitor NPA. By localized application of NPA at the shoot-root junction of the 4 selected cultivars,we found that NPA appeared to reduce crown root numbers in general. Cultivars with large number of crown roots were more sensitive to low concentration of NPA than eultivars with small numbers. These data indicated that auxin and po- lar auxin transport determines crown root number in rice.

关 键 词：水稻根系多样性 核心种质资源 冠根 生长素 1-萘氨甲酰苯甲酸(NPA) 

分 类 号：S511.502.4[农业科学—作物学]