关键词: PR10, PR10, 结构, 功能, 信号转导

Abstract: The field experiments of 7 kinds of seeding-date ( May 21, May 26, May 31, June 5, June 10, June 15, June 20) of new corn variety ‘Zhenghuangnuo 2’were conducted to find the most suitable sowing-date in 2013. With the delay of sowing date, duration of each corn growth stage was shortened, the rate of rough dwarf disease reduced. Comparing with sowing date of May 21, the growth period was shortened for 13 d and 28 d when sowing date was on June 5 and June 20, and the rate of maize rough dwarf disease was 3.47% and 0, respectively. With the sowing date delayed, ear length, ear diameter and ear rows had no obvious change, kernels per row reduced and bald tip length increased , the yield of ‘Zhenghuangnuo 2’first increased and then decreased. Kernels per row reduced by12.12% and bald tip length increased by 0.06 cm under sowing date of June 5 comparing with sowing date of May 21, while kernels per row increased by 2.00% and bald tip length reduced by 1.47 cm comparing with sowing date of June 20. The yield was the highest (11268.58 kg/hm2) under the sowing date of June 5, and it increased by 6.81% and 27.81% than that of sowing date of May 21 and June 20. With the sowing date delayed, the crude starch content and skin dregs ratio of grain increased and soluble sugar content decreased. Under the same harvest time, the earlier the sowing date the better the fresh food quality of ‘Zhenghuangnuo 2’ . Taking above factors and production practice into account, the suitable sowing date of ‘Zhenghuangnuo 2’was from May 25 to June 5, and the corn should be sowed as early as possible after the wheat harvesting.