冬小麦较多小穗基因型幼穗分化研究

RATE AND DURATION OF SPIKELET ENITIATION IN WINTER WHEAT WITH MORE SPIKELETS

较多小穗基因型与正常穗基因型比较，小穗数目的增加是由穗分化时期的增长和速率的增加决定的，其速率的作用大于时期的作用。在较多小穗基因型内，同一组合内不同基因型间小穗数目的差异，主要由穗分化的速率决定。认为较多小穗基因型普遍具有高的分化速率，并随穗分化速率的加快而小穗数逐渐增多。选育高穗分化速率基因型是解决较多小穗晚熟问题和提高育成品种单穗粒重及其生产潜力的重要途径。

This paper compare differences of rate and duration of spikelet enitiation in winter wheatwith regular(CK)and more spikelets.Results indicate that the increased spikelets of thegenotypes of the more spikelets have decided by the day of the duration from dual angle stageto the up spikelet appear and the rate of spikelet enitiation(No. spikelets/day).Effect of theincreased spikelets by raised the rate of spikelets enitiation is biger than that the increaseddays of spikelets enitation. In the same cross with more spikelets,difference of genotypeswith dissimilar No. spikelet chief has decided by spikelet enitiaon rate. our consider that thetested genotypes of the more spikelets regularally have a high spikelets enitiation rate. Thosegenotypes spikelets has got increased with its spikelet enitiation rate increased. Hence,one ofthe importental way in the winter wheat breeding is to apply those genotypes with the highspikelet enitiation rate to solve late ripe of genotypes with more spikelets and to raise the perear No. grain of breeded variety and its product potential.