不同基因型水稻磷素营养差异机理的研究  

The Mechanism of P Nutrition Differences in the Different Rice Genotypes

作　　者：李莉梅[1] 

机构地区：[1]湛江师范学院广东高校边缘热带特色植物工程技术开发中心,广东湛江524048

出　　处：《华北农学报》2013年第2期155-160,共6页Acta Agriculturae Boreali-Sinica

基　　金：湛江市科技攻关项目(2012C3103019);广东省"十五"重大科技专项(2002A2040902);广东高校边缘热带特色植物资源工程技术开发中心项目(GCZX-B1002);广东省自然科学基金(S2011040005295);国家自然科学基金(31101137)

摘　　要：以磷高效基因型水稻屉优418、辽优2005和磷效低基因型培杂茂三为材料,采用水培试验,分别从根系形态学,磷吸收、利用和运转效率等方面进行了研究,探讨了不同基因型水稻磷素营养差异的机理,结果表明,磷高效基因型水稻是磷吸收效率、运转效率和利用效率高的结果。较大的根体积、根总吸收面积、活跃吸收面积、根系活力,Km、Cmin小,Imax大等是水稻对磷高效吸收的特征。但基因型不同,特征也有区别,本试验中屉优418对磷高的吸收效率主要是由于根系强大,Imax大所致,而辽优1025高的磷吸收效率则主要缘于根总吸收面积、活跃吸收面积大,根系活力强。Solution culture was conducted to study on the aspects,such as root morphology,P uptake efficiency,P utilization and translocation efficiency,et al.The mechanism of the difference in P efficiency of different rice genotypes was probed.The results of the study are as followed：P efficiency of rice depended on co-ordination of P absorption efficiency,utilization and translocation efficiency;The rice genotypes with higher P uptake efficiency were characterized by more extensive root systems coupled with its higher total uptake area,active uptake area higher root activity and desirable kinetic parameters of P uptake,showing lower Km and Cmin,but longer Imax values.However,the characteristics were different among genotypes.In this experiment,the higher P uptake efficiency of Tiyou 418 depended on more extensive root systems and longer Imax value.But the higher P uptake efficiency of Liaoyou 1025 mainly resulted from larger total uptake area,active uptake area and higher root activity.

关 键 词：水稻 基因型 差异 机理 

分 类 号：S511.01[农业科学—作物学] S143.2