Response of Compensation Effect of Winter Wheat to Different Rates of Water-retaining Agent

YANG Yong-hui; WU Ji-cheng; LI Xue-jun; LI Zong-jun; HE Fang; HOU Zhan-ling; YANG Xian-ming

doi:10.3969/j.issn.1004-3268.2013.12.016

Abstract：In order to ascertain the response of compensation effect of the winter w heat to differ-ent rates of water-retaining agent (0 mg/kg ,27 mg/kg ,54 mg/kg ,and 81 mg/kg) ,the pot experi-ment was employed to study the effect of water-retaining agent on the wheat leaf ,root physiologi-cal characteristics and yield under the drought stress and efficient irrigation conditions .T he re-sults indicated that at jointing stage ,leaf plasma membrane permeability dropped firstly ,and then increased with the increase of water-retaining agent before rewatering under the two moisture conditions ,which were lower than those of the control .In the drought stress condition ,root vigor increased significantly with the increase of water-retaining agent ,while it first increased ,then dropped and increased again under the sufficient irrigation condition .After rewatering in the drought stress and efficient irrigation conditions ,the treatment with 81 mg/kg of water-retaining agent had the lowest cytoplasm membrane permeability and the strongest root vigor compared with the control .To filling stage ,the leaf plasma membrane permeability of the treatment with 81 mg/kg of water-retaining agent was significantly higher than that of the control before and after rewatering under the drought stress condition ,while there was no significant difference among the treatments under the efficient irrigation condition .Under drought stress condition ,the treatment with 27 mg/kg of water-retaining agent had the highest root vigor compared with the other treat-ments after rewatering ,while the treatment with 54 mg/kg of water-retaining agent brought about the best effect under efficient irrigation condition .The wheat yield and water use efficiency of the water-retaining agent treatments under the efficient irrigation condition had higher increase than those under the drought stress condition ,in which the treatment with 54 mg/kg of water-retaining agent performed the best effects ,with yield and water utilization effeciency increasing by 9 .3% and 9 .0% ,respectively ,compared to the control .However ,the treatment with 27 mg/kg of water-retaining agent performed the best effects under drought stress ,and its yield and water uti-lization effeciency both increased by 6 .9% compared with the control .