作　　者： ; ; ;

机构地区： 湖南城市学院

出　　处： 《生物技术进展》 2012年第3期184-189,共6页

摘　　要： 以水稻(Oryza sotivaL.)受体N27(对照)和来源于N27的耐低钾基因型水稻N18和N19为材料,采用溶液培养试验,研究了低钾胁迫对其生长及生理特性的影响。结果表明,在低钾胁迫下,水稻的株高、地上部鲜重和地上部干重均受抑制,但N27抑制程度较N18、N19明显。在低钾胁迫下,水稻的根长、根干重、根系体积和根系活力均降低,但N18、N19的根长、根干重和根系体积均显著高于N27,N18、N19的根系活力也比N27强。低钾胁迫使3个基因型水稻的根冠比增大,但基因型间差异不显著。在低钾胁迫下,水稻叶片游离氨基酸和可溶性糖含量升高,且N18、N19升高幅度显著小于N27;低钾胁迫使水稻叶片可溶性蛋白质含量均下降,N27下降幅度显著高于N18、N19。 Two low potassium tolerant rice（Oryza sotiva L.）genotype,N18 and N19,and their recipient,N27（control） were used in this experiment to investigate the effects of low potassium stress on the growth and changes of several physiological indexes of different rice genotypes at seedling stage.The results showed that under low potassium stress,the height,fresh and dry weight of shoots of the recipient depressed greater than that of low potassium tolerant rice genotypes.Under low potassium stress,root length,root dry weight,root volume and root vigor of all genotypes were decreased,which were more significantly of N18 and N19 than those in N27 respectively.Furthemore,low potassium stress increased the ratio of root/shoot,but the differences in it were inconspicuous among the three genotypes tested.Under low potassium stress,free amino acid contents and soluble suger content in leaves of all genotypes were increased,the increases of which were less in N18 and N19 than in N27.Under low potassium stress,soluble protein contents in leaves were decreased,reductions of which were more in N27 than in N18 and N19.

关 键 词： 水稻 低钾胁迫 基因型差异 生理指标

领　　域： [农业科学]