摘要
系统研究了2个播期条件下24个水稻体细胞无性系及其1个供体亲本主要农艺性状播期响应指数（RITSD）的变异特点,主要结论如下：①株高、着粒密度、每穗实粒数、每穗着粒数及单株粒重5个性状的RITSD均值相对较大（大于1）,对播期反应较敏感,其性状值随播期推迟而增大;而播始天数、单株穗数、穗长、结实率及千粒重RITSD均值相对较小。②体细胞无性系各性状RITSD均发生了遗传变异,但不同性状间RITSD的变异频率及变异方向有较大差异：始播天数和株高的RITSD变异频率较高,而穗长的RITSD变异的机率较低;株高及千粒重的RITSD值变小,而单株穗数、穗长、着粒密度、每穗实粒数、每穗着粒数及结实率的RITSD值变大,播始天数和单株粒重RITSD的变异方向为双向变异。③供试的24个体细胞无性系中,有20个株系与供体亲本RITSD呈显著差异,RITSD的变异率达83.3%,但约75%的体细胞无性系仅1-2个性状的RITSD发生了显著变异。④聚类分析表明,体细胞无性系农艺性状RITSD存在不同的变异组合。
The RITSD changing of agronomic traits was studied by using 24 rice somatic lines and its donor parent under two sowing dates. The main results were as following： （i） the average values of RITSD were higher （ over one） for the traits of pant height （PH） , density of spikelets （DS）, filled spikelets per panicle （FSP）, spikelets per panicle （SP） and grain weight per plant （GWP） , but lower for days of sowing to heading （ DSH）, effective panicles （EP） ,panicle length （ PL）, seed setting rate （SS） and 1000-grain weight （1000-GW）. These showed that PH, DS, FSP,SP and GWP were Easily effected by sowing date and tended to higher with the later sowing. （ii） The RITSD of somatic lines changed with the agronomic traits. The frequency of RITSD＇ variation of DSH and PH was higher than that of PL. The RITSD＇ value of PPP, PL, DS, FSP, SP and SS became higher, and higher or lower for DSH and GWP in different somatic lines. （iii） Compared with the donor, twenty of twenty-four was significantly different, and the frequency of RITSD variation was over 83.3 %, however,RITSD of the most lines （75 % ） changed only for 1 - 2 characters. （iv） Cluster analysis showed that the RITSD of agronomic traits belonged to different combinations of somatic lines in rice.
出处
《西南农业学报》
CSCD
北大核心
2009年第1期1-7,共7页
Southwest China Journal of Agricultural Sciences
基金
重庆重大攻关项目“杂交水稻育种新材料创新(CSTC,2007,AA1019)”
四川省育种攻关项目(06yzgg-01)
关键词
水稻
体细胞无性系
播期响应指数(RITSD)
农艺性状
变异
Rice （Oryza sativa L. ）
Somatic lines
Respondence Index of Trait to Sowing Date （RITSD）
Agronomic traits
Variation
