甘农1号小黑麦的田间抗旱性研究

Field Studies on the Drought Resistance of Triticale wittmack‘ Gannong No.1'

以‘甘农1号'小黑麦(Triticale wittmack)为试验材料,‘石大1号'(CK1)和‘中饲1048'(CK2)为对照,通过测定不同干旱胁迫天数的土壤水分含量和生理生化指标,以研究‘甘农1号'小黑麦的田间抗旱性,为其在西北干旱半干旱雨养农业区种植提供参考。于小黑麦分蘖期采用遮雨棚控水法进行干旱胁迫处理,分别在干旱胁迫第7,14,21,28,35和42 d测定土壤含水量,并采集叶片测定其可溶性糖含量、脯氨酸含量和丙二醛含量等生理生化指标,直到小黑麦地上部分萎蔫至死亡。结果表明:除品种间和品种×干旱胁迫天数交互作用间丙二醛含量无显著差异外,品种间、干旱胁迫天数间和品种×天数互作间可溶性糖、脯氨酸、POD、SOD、CAT含量均存在极显著差异(P<0.01)。3个小黑麦品种的抗旱能力强弱依次为:‘甘农1号'>CK2>CK1,‘甘农1号'属于中抗旱型,CK1和CK2为干旱较敏感型。

To investigate the field drought resistance of Triticale wittmack ‘Gannong No. 1 ＇,two varieties of triticale（‘Shida No. 1＇（CK1） and ‘Zhongsi 1048＇（CK2）） were used as control materials. The soil water content and physiological and biochemical indexes were measured after different days of drought stress,which would provide reference information for planting it in the rain fed farming area of northwest China. At the tillering stage of triticale,the soil water content,the contents of soluble sugar,proline（Pro）,malondialdehyde（MDA）,and the activities of peroxidase（POD）,superoxide dismutase（SOD） and catalase（CAT） in the leaves were measured at 7,14,21,28,35 and 42 days（the plants began to wilting） after drought stress by controlling water in rain-proof shelter.The result showed that except for MDA content,there were significant differences in soluble sugar,Pro,POD,SOD and CAT among varieties,drought stress days and interaction between them（P 0. 01）. These findings suggest that the drought resistance of three varieties decreased in the order： ‘Gannong No. 1 ＇ CK2 CK1,so ‘Gannong No. 1 ＇ belongs to the middle resistant type,CK1 and CK2 belong to the drought sensitive type.