اثر زمان نشاکاری بر مورفولوژی خوشه و صفات مرتبط با آن در ارقام برنج

For evaluation the effect of transplanting date changes on panicle morphology and attributed traits, an experiment was conducted in randomized complete block design as factorial with three replications at Haraz extension and technology development centre in spring of 2013. Treatments were including of transplanting dates in three levels, 5th, 17th May and 10th June and six cultivar of rice. Results showed that, there were significant difference among cultivars (p<0.01) for all panicle attributed traits, means number of rachis primary branches, number of rachis secondary branches, number of spikelet in panicle, number of spikelet in rachis primary branches, number of spikelet in rachis secondary branches, panicle fertility percentage, fertility percentage of rachis primary and secondary branches, grain weight in rachis primary and secondary branches. The effect of transplanting dates on all panicle related traits except number of spikelet in rachis primary branches and fertility percentage in rachis secondary branches were significant. grain weight in rachis primary branches in first and second transplanting dates were 27.46 and 27.42 mg respectively, located in one group higher than third transplanting date, 26.56 mg. Results showed that the ratio of rachis secondary branch to rachis primary branch in high yielding cultivar (3.07) was more than local cultivar (2.29) because of increasing in rachis secondary branch. Hence rachis secondary branch attributed trait were more variable compare with rachis primary branch in different transplanting date especially in third transplanting date, and correlation of important traits like panicle fertility, number of panicle branches and number of spikelet in panicle with primary rachis branch (r=0.87**, 0.87**, 0.77** respectively), was significant only in local cultivars, then panicle traits in local cultivars can be more stable in climate change condition.
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