Research On Spikelet Differentiation And Ear Formationg Of The "Coordination-Type" Wheat New Cultivars

The experiment was based on four wheat (Triticum aestivum L) cultivars: Chuan Nong 17, Chuan Nong 19, Mian Yang 11 and Chuan Mai 107, contrast chuannong19.chuanmai107and mianyang11 with chuannong17, Chuan Nongl2 and Chuan Nong 18 to do more systematic and future research. It is researched on morphologic, anatomy to discovery different cultivars, different period of growth, and different tillers and the corelationships with Survival of fertile wheat. The research results is below:1. Growing degree days after sowing (GDD) is a effective measurement to measure wheat growth, three similar breeds who has the same growth cycle: Chuan Nong 17, Chuan Nong 19, Chuan Mai 107, Chuang Nong 17 from T2—T7 Tillers, eath tiller need the least GDD averagely, and in Stem elongation need GDD most, this is so important to tillers'growth. And in Booting stage need less GDD. It has some effect to bottom spikelets'fertility.2. In the procession of growth, every breeds have different last time in different period of growth, Main stem Apex at Single ridge last longer time can help the number of spikelets increasing. After Stem elongation ,longer period of growth can make the number of grain increase.3. T0( The coleoptile tiller) in the procession of vegetative stages and before reproductive stages, There is a big changes in stem apex growth and development . TO have particular delay effect to its stem apex growing at after reproductive stages. but when the growing apex changes from the vegetative stages to the reproductive stages, no dramatically differentiation in apical development .As for a TO which can contribute to yield, if it is not affected by environments and surroundings, its entire growth curve is similar with that of T3 or T11 tiller' apical growth.4. Tiller emergence early do not all mean more fertile tillers, you have to think of lasting time at entire vegetative stages of each apex, when stem apex reach terminal...