氮高效水稻种质资源筛选的初步研究

采用在遮雨网室盆栽和不同施氮处理对1107份水稻种质资源不同生长时期的苗高、分蘖数和干物重等性状进行了研究.结果表明最高分蘖期相对干物重与不同时期相对苗高和相对分蘖数呈极显著正相关.不同时期相对苗高与相对分蘖数之间亦呈显著或极显著正相关.相对分蘖数、相对苗高和相对干物重在水稻种质资源中存在较大的变异,分蘖数可作为氮高效资源筛选的形态指标.通过比较5个时期苗高和分蘖数的相对生长量及最高分蘖期干物重的相对含量共11个指标,初步筛选出14份氮高效资源.

Screening for rice genotypes tolerant to low nitrogen

Totally 1107 accessions of rice germplasms were evaluated for plant height and tiller number at different development stages,and dry matter weight at maximum tillering period with two treatments of applied N and unapplied N in a pot experiment in screenhouse under rain-shelter.Relative growth rate was used for N use efficiency.The result indicated that relative dry matter weight (RDMW) at maximum tillering period was significantly and positively correlated with the relative plant height (RPH) and relative tiller number (RTN).Significant positive correlation existed between RPH and RTN at different development stages.Significant differences in rice germplasm were found for RPH and RTN at different development stages,and RDMW at maximum tillering period. Tiller number might be used as selection index for screening rice germplasm with high N use efficiency.Forteen rice germplasm accessions with high N use efficiency were selected with 11 indices including RPH,RTN and RDMW.