山东省部分小麦材料的抗旱特性分析

以山东地区21个小麦品系为材料,用聚乙二醇-6000(PEG-6000)模拟干旱胁迫,以小麦萌发期的发芽率、胚根数、主根长、胚芽鞘长为实验指标研究不同品系冬小麦在水分胁迫下萌发期的抗旱特性;用幼苗反复干旱鉴定方法,比较不同品系冬小麦在水分胁迫下苗期的抗旱特性;在旱棚内人工控制水分模拟干旱胁迫,以小麦开花期及灌浆期的株高、穗下第一节间长、叶片相对含水量、叶片POD活性,成熟期的产量为实验指标,研究不同品系冬小麦在水分胁迫下中后期的抗旱特性。结果表明:品系11、17、12、4、6、15、14全生育期抗旱性强;品系13全生育期不抗旱;品系20、9、2、19、18萌发期、苗期抗旱性强;品系10、5萌发期、中后期抗旱性强;品系7、1、8苗期抗旱性强;品系16、3苗期、中后期抗旱性强。通过对21份小麦品系萌发期的综合抗旱系数、苗期的综合抗旱系数、中后期的综合抗旱系数进行相关分析,结果表明小麦各生育期抗旱相关性不强,其中苗期综合抗旱系数与中后期综合抗旱系数相关系数最高为0.465。

Analysis of drought resistance of some wheat materials in Shandong Province

Through the use of PEG-6000 simulated drought stress, 21 shangdong wheat varieties were used as experimental materials to study the effects of different strains on the growth and development of winter wheat. Germination rate, coleoptile length, main root length, root number, were as the experimental indexes to compare different varieties drought-resistance characteristics of winter wheat. In seedling stage seedling drought repeatedly appraisal method was used to compare drought-resistant characteristics of winter wheat under water stress. In middle and late stages through use of the artificial water control dry shed simulated drought stress, during flowering period and filling period the first internode below the plant height, spike length, leaf relative water content, leaf POD activity, the output of maturity indicators as the experimental indexes to analysis different strains of winter wheat drought-resistant characteristics under water stress. The results showed that:11, 17, 12, 4, 6, 15, 14 strains drought resistance during the whole growing period was strong; 13 strain was susceptible to drought during the whole growth period; 20, 9, 2, 19, 18 strains drought resistance was strong during germination and seedling stages; 10, 5 strains drought resistance was strong during germination and middle and late stages; strain 7, 1, 8 strains drought resistance was strong during seedling stage; 16, 3 strains drought resistance was strong during the seedling and middle and late stages. The comprehensive drought resistance coefficient of seed germination period of 21 wheat varieties, comprehensive drought resistance coefficient at seedling stage and comprehensive drought resistance coefficient in late stage were analyzed. The results showed that the growth period of wheat drought resistance was not always strong at each stage , seedling stage of middle and late periods were of the highest correlation coefficient of 0.465.