The Correlation Analysis Of Important Agronomic Traits Of Spring Wheat In Response To Heat Stress

Wheat is one of the main food crops, which plays an important role in ensuring the food security of our country and the world. Wheat is chimonophilous. High temperature stress makes wheat growth period shorten, yield declined and even no crops. However, the research on heat resistance of wheat is still very weak, and it only have a relatively single screening index of heat resistance, which increases the difficulty of screening heat resistant varieties.Therefore, it is very necessary to study the effect of high temperature on different agronomic characters of wheat in order to screen more heat resistant indexes.The study of 40 with different heat tolerance of spring wheat lines as materials, through different sowing stages(the first sowing date for normal sowing and after sowing for sowing treatment) method, to deal with sowing period in spring wheat applied the high temperature stress, The research study a variety of materials growth period days, plant height et al Agronomic Traits and accumulated temperature of growth period variation in different sowing period. By variance analysis, correlation analysis and linear regression analysis of the corresponding data, the conclusions are as follows:1.Compared with the normal sowing date, late sowing experienced daily average temperature in the different growth stage were higher than that of the first sowing dat. The accumulated effective temperature values were higher than those of the first sowing date and with the delay of sowing date, vegetative growth stage and flowering stage of effective accumulated temperature is higher and higher. In the grouting and reproductive growth stage due to the average daily temperature is too high, resulting in growth duration reduced, so the effective accumulated temperature is reduced. It was confirmed that the stage of sowing could provide high temperature stress to spring wheat, which provided a strong evidence for the research of heat tolerance in spring wheat field.2.Compared with normal sowing date, after late sowing treatment, spring wheat at different growth stages of accumulated temperature(vegetative growth stage accumulated temperature, flowering stage and accumulated temperature in filling stage, the accumulated temperature and reproductive growth stages accumulated temperature), the growth perioddays(days of vegetative, flowering days, filling time and reproductive long days) and agronomic traits(plant height, Panicle under section long, other section long) between the different sowing dates showed significant change. It showed that the agronomic traits were significantly affected under high temperature stress.3.The results of correlation analysis showed that plant height and its composition factors were closely related to the characteristics of different growth stages, and the correlation coefficient was highest with other nodes.4.Linear regression analysis showed that under high temperature stress, peduncle length and other nodes long respectively contribute 84.5% and 65.6% on plant height variation. The other nodes length on plant height effect is larger, both have the role of superposition on the decisive of plant height. Moreover, it is found that Other nodes long is influenced higher by vegetative growth days. The Panicle under section long is influenced larger by reproductive growth days. But the two are subjected to the flowering stage required temperature determination coefficient that is larger.