稻种资源苗期氮素营养特性的基因型差异  

Genotypic Differences on Nitrogen Nutrition Characteristics of Rice Germplasms at Seedling Stage

作　　者：程建峰[1] 戴廷波[1] 曹卫星[1] 姜东[1] 

机构地区：[1]南京农业大学农业部作物生长调控重点开放实验室

出　　处：《中国水稻科学》2005年第6期533-538,共6页Chinese Journal of Rice Science

基　　金：国家自然科学基金重点资助项目(30030090);国家863计划资助项目(2003AA209030)。

摘　　要：采用变异数和频数分析,对88份稻种资源进行了苗期氮素利用效率(NUE)、吸收效率(NAE)和氮素利用效率响应度(NUER)的基因型差异比较。结果表明:1)不同稻种资源苗期的NUE、NAE和NUER存在显著的基因型差异,且受氮素水平的影响。低氮、中氮和高氮间的NUE存在极显著差异,并随氮素水平的升高而呈下降趋势。低、中氮间的NAE的差异不显著,但极显著地小于高氮;(低氮NUE-高氮NUE)/高氮NUE的NUER极显著高于(低氮NUE-中氮NUE)/中氮NUE、(中氮NUE-高氮NUE)/高氮NUE的NUER,且后两者间未达显著差异。2)不同稻种资源苗期NUE、NAE和NUER的变异系数存在极大的差别(达20%以上),大小顺序为NUER>NAE>NUE,即稻种资源苗期NUE、NAE和NUER的基因型差异大小是NUER>NAE>NUE。3)不同稻种资源苗期NUE、NAE和NUER的基因型分布,基本上符合正态分布,拟合度最好的是NUE,其次为NAE,NUER最差。Through variation and frequency analysis, the genotypic differences in nitrogen utilization efficiency （NUE）, nitrogen absorption efficiency （NAE） and nitrogen utilization efficiency response （NUER） of 88 rice germplasms were studied. NUE, NAE and NUER of the tested rice at seedling stage had notable genotypic discrepancy, and were influenced by nitrogen application. NUE differed significantly under low, medium and high nitrogen, and dropped with the increase of nitrogen application. NAE wasn＇t significantly different under low and medium nitrogen, but was notably smaller than that under high nitrogen. NUER between low and high nitrogen was more notably higher than that between low and medium nitrogen or between medium and high nitrogen, and the latter two hadn＇t significant discrepancy. The coefficients of variation among NUE, NAE and NUER of rice germplasms at seedling stage were greatly different （above 20%） and the order of them was NUER〉NAE〉NUE. The genotypic distributions of NUE, NAE and NUER of rice germplasms at. seedling stage basically resembled a normal curve, and the order of good-of-fitness was NUE〉NAE〉NUER.

关 键 词：水稻 种质资源 氮素营养特性 基因型差异 秧苗 

分 类 号：S511[农业科学—作物学]