%0 Journal Article
%T Effect of the nitrogen and phosphorus levels and meteorological conditions on formation dynamics of grain protein content in spring wheat<br>氮磷水平与气象条件对春小麦籽粒蛋白质含量形成动态的影响
%A ZHAO Xiu-Lan
%A <br>赵秀兰
%J 生态学报
%D 2005
%I 
%X Wheat grain protein content depends on the genotype used and the environmental factors. Soil fertility and meteorological conditions are important environmental factors. The effects of N and P application and meteorological conditions on mature grain protein content have been reported in the literature, but the effects on protein content during grain filling are less known. In the present paper, the field experiments of N and P application and sowing by stages in Harbin in 2002 were used to investigate the dynamic pattern in grain protein content and how it is affected by the N and P levels and meteorological conditions during grain filling. The three genotypes of spring wheat of differing quality included a high protein - rich gluten - low yield genotype (Wildcat),a high protein - medium gluten - high yield genotype (DN7742)and a low protein - poor gluten - high yield genotype(NKH9). The N and P application experiments included F1 (N: 225 kg/hm~2, P_2O_5: 450 kg/hm~2), F2 (N: 300 kg/hm~2, P_2O_5: 300 kg/hm~2), F3 (N: 300 kg/hm~2, P_2O_5: 450 kg/hm~2) and F4 (N: 300 kg/hm~2, P_2O_5: 600 kg/hm~2) treatments. The least squares method was used to finish the curve fitting of the dynamic pattern in the grain filling protein content. The results showed that the dynamic changes in grain protein content with the number of days after anthesis could be fitted with a third-order concave curve,and the effects of genotypes and environmental factors on the grain protein content formation dynamic could be expressed by the characteristic variables of the curve equation. With the increase in nitrogen during grain filling, the protein content of the high protein genotypes increased, the peak and valley values of the dynamic curve rose significantly, and the valleys occurred earlier while the peaks occurred later. With the increase in phosphorus, the grain protein content decreased in the high protein - rich gluten genotype but increased in the high protein - medium gluten genotype; and the extreme values in the high protein genotype rose and the dates of the extreme values were postponed generally. Protein content in the low protein - poor gluten genotype varied weakly with the nitrogen and phosphorus application. F2 and F3, and F3 were the levels and ratios of the highest protein content for the high protein - rich gluten and high protein - medium gluten genotypes, respectively. A rational ratio and level of nitrogen and phosphorus application were key to elevate the grain protein content during grain filling. Under the condition of moderate rainfall, the interaction of temperature and sunlight was the predominant factor affecting the dynamic formation of grain protein for different genotypes, and rainfall was the second factor; the diurnal temperature range was the most sensitive factor influencing its dynamic formation. The interaction of higher sunlight and temperature was the basis for the formation of higher grain protein content during grain filling in whic
%K spring wheat
%K grain protein content
%K formation dynamics
%K nitrogen and phosphorus levels
%K meteorological conditions<br>春小麦
%K 籽粒蛋白质含量
%K 形成动态
%K 氮磷水平
%K 气象条件
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=4F0FA3A1181814CF&yid=2DD7160C83D0ACED&vid=C5154311167311FE&iid=5D311CA918CA9A03&sid=3F70AF647A5D3F8D&eid=245C5ED8B3BAFA8A&journal_id=1000-0933&journal_name=生态学报&referenced_num=6&reference_num=46