The Effects Of Nitrogen Stress On The Accumulation And Nitrogen Utilization Efficiency Of Synthetic Wheat Yield High Yield Variety

The artificial synthesis of hexaploid wheat(synthetic-hexaploid wheat),with strong resistance to disease and resistance,was significantly higher than that of the samovar parent,which was composed of durum wheat(2n=4x=28,AB genome)and the artificial synthetic hexaploid wheat(artificial synthetic wheat,SHW).Artificial synthetic wheat has been used as a bridge and means for the good gene utilization of wild ancestors.In recent years,sichuan has developed and popularized a series of synthetic wheat varieties,which have performed well in production.Material production ability and the nitrogen uptake ability is one of the important physiological basis for high yield of wheat,based on this,this experiment under the condition of fertilizers were applied 60 kg/hm~2,set the jointing stage without nitrogen and nitrogen(90 kg/hm~2)cause birth later period of wheat nitrogen stress environment,with three SHW derived varieties(CM42,CM104,MM367)and 6 common wheat varieties(CM 55,NM836,MM37,XK5,CN16,CM30)as the material,for two consecutive years in guanghan hills wheat expert field field experiment was carried out in the yard,In order to explore the material production and nitrogen utilization characteristics of SHW derivatives in late middle and late nitrogen stress,the results are as follows.1.The SHW derived varieties compared with common wheat varieties,it has advantage of outstanding production,among them,in 2015/2016,later period under nitrogen stress treatment,SHW derived varieties than ordinary varieties increase 22.86%,SHW derived under normal nitrogen treatment than ordinary varieties increase 21.88%;In 2016/2017,under nitrogen stress in the middle and late stage,the SHW derived varieties increased by 10.73%compared with the common varieties,and the yield of SHW derived varieties under normal nitrogen was 14.39%higher than that of the common varieties.The high yield of SHW derived varieties was derived from its high grain capacity.Compared with ordinary wheat varieties,the unit grain capacity increased by about 14%,and the 1000-grain weight was the same as that of ordinary wheat varieties.2.Compared with common wheat varieties,SHW derived varieties have higher ear capacity and unit grain capacity.The yield of SHW derived varieties was higher than that of normal wheat cultivars,and the effective spike of nitrogen treatment(N150)was 13.3%higher than that of normal wheat cultivars,and the effective spike was increased by 13.96%in nitrogen stress(N60).And the unit capacity increased by 14.01%and14.44%.3.It was found that that effective period of the leaf blade was long after the SHW derivative were compared with common wheat varieties.The SPAD value of the two varieties was not significant at 0~22d after flowering,but the SPAD value of the normal variety was decreased rapidly after flowering 22d,while the SPAD value of the SHW derived variety SPAD was sustainable to 27~32d after the flowering.4.The SHW derived varieties have stronger ability of dry matter production than ordinary wheat varieties.The amount of dry matter produced by SHW derived varieties increased by 20.08%compared with that of common wheat under nitrogen stress treatment.Under normal nitrogen treatment,it was 14.13%higher than that of common wheat varieties.5.SHW derived varieties have higher nitrogen utilization rate.The nitrogen stress treatment significantly reduced the amount of effective panicle n accumulation in the flowering period of two kinds of cultivars,and the proportion of young panicle in flowering stage was significantly higher than that of normal nitrogen treatment.SHW derived varieties of nitrogen uptake efficiency,nitrogen use efficiency and nitrogen partial productivity under two nitrogen treatment were significantly higher than that of common wheat varieties,and hundreds of kilograms of grain nitrogen uptake was significantly lower than ordinary wheat varieties.On the nitrogen response index,the average value of SHW derived varieties was higher than that of ordinary wheat varieties.6.It was found that in that case of nitrogen stress,the decrease of dry matter and production was less than ordinary variety,and the efficiency index of nitrogen was higher than that of common wheat cultivar,with better stability.The SHW derived variety is the absorption and utilization of double-efficient wheat.Its efficient absorption of nitrogen utilization,to ensure the whole growth period is relatively sufficient nitrogen nutrition supply,on flag leaf after flowering,pour 2 leaf senescence is relatively slow,longer effective function,dry matter production,especially after the flower of dry matter production capacity is significantly higher than ordinary wheat varieties.At the same time,in the structure of the source library,the SHW derived varieties have a large capacity of storage capacity,and the yield potential is large,and the dry matter in the mature stage has a large proportion of grain,thus producing high yield and stable yield.