RITSD analysis of the agronomic traits of somatic lines in rice.

[Objective]The aim was to study the sensitive response characteristics of the main agronomic traits of somaclonal and the variation of sensitive response of the lines of somaclonal to sowing date. [Method]The RITSD changing of agronomic traits was studied by using 24 rice somaclonal and its donor parent under two sowing dates. [Result]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 1 000-grain weight (1 000-GW). These showed that PH,DS,FSP,SP and GWP were easily affected by sowing date and tended to higher with the later sowing; the RITSD of somaclonal changed with the agronomic traits. The frequency of RITSD' variation of DSH and PH was higher than that of PL. The RITSD' value of EP,PL,DS,FSP,SP and SS became higher,and higher or lower for DSH and GWP in different somaclonal; compared with the donor,20 of 24 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; cluster analysis showed that the RITSD of agronomic traits belonged to different combinations of somaclonal in rice. [Conclusion]the study had provided a theoretical basis for the screening and using of the somaclonal.