采用溶液培养和放射性同位素技术, 比较籽粒低锌含量基因型水稻( Oryza sativa L .) 湘早籼 17 与籽粒高锌含量基因型水稻 V56 根系形态及有关生理特性的差异, 发现 V 56 的根系比湘早籼 17 大( 根较长, 根体积较大, 生物量较高) 、根冠比值较高及根系吸收锌的 K m值较低, 因而对锌的吸收量较大。 这些特性可作为筛选籽粒高锌含量基因型水稻的指标。
 

Comparative studies on the difference of root morphological and physiological characteristics related with zinc absorption between two varieties of rice , one named “Xiangzhaoxian 17” which belongs to Zn-poor grain genotype and the other named V56 which belongs to Zn-rich grain genotype, were carried out by means of using solution culture and radioisotope techniques. Compared with “Xiangzhaoxian 17”, V56 has bigger root system ( longer length, bigger volume and greater biomass) , greater root-top ratio, and lower K m value of zinc uptake by root, so that V56 absorbs zinc more efficiently . These characteristics may be used as indexes for screening Zn-rich grain genotype rice.