五种猕猴桃砧木的抗旱性评价OA

Taking'Actinidia valvata',A.chinensis'Guangfeng',A.deliciosa'Miliang 1',A.eriantha×A.chinensis'Jinyan',and Actinidia chinensis'Chuanmi'as test materials,a potted drought stress treatment was conducted to study the effects of drought stress on these five kiwifruit rootstocks and compare their drought tolerance,in order to provide a reference for selecting drought-tolerant kiwifruit rootstocks.The results showed that after drought treatment,the leaf relative water content of the five kiwifruit rootstock varieties all showed a downward trend,with the decreasing rate order being'Guangfeng'>'Jinyan'>'Chuanmi'>'Miliang 1'>'Actinidia valvata'.The leaf relative electrical conductivity of different rootstock varieties showed an upward trend,with the increasing rate order being'Jinyan'>'Guangfeng'>'Chuanmi'>'Miliang 1'>'Actinidia valvata'.The proline and malondialdehyde(MDA)contents of different rootstock varieties showed an upward trend.At 28 days of treatment,'Actinidia valvata'had the highest proline content,while'Jinyan'and'Guangfeng'kiwifruit had the highest relative electrical conductivity and MDA content.With the extension of drought treatment time,the activities of soluble protein,soluble sugar,SOD,and POD showed a trend of first increasing and then decreasing.At 28 days of treatment,'Actinidia valvata'and'Miliang 1'were significantly higher than the other varieties.After drought treatment,the net photosynthetic rate of leaves of different rootstock varieties decreased significantly,with'Actinidia valvata'and'Miliang 1'kiwifruit being significantly higher than the other varieties.Principal component analysis and membership function analysis indicated that the comprehensive score for drought resistance of the five kiwifruit rootstock varieties was in the order of'Actinidia valvata'>'Miliang 1'>'Chuanmi'>'Jinyan'>'Guangfeng'.'Actinidia valvata'and'Miliang 1'kiwifruit are classified as strongly drought-tolerant varieties,making them the preferred kiwifruit rootstocks for red soil arid regions.