淹水胁迫及胁迫解除对甜瓜幼苗呼吸等生理代谢的影响

以耐涝性稍强的脆禧和耐涝性较弱的世纪蜜甜瓜品种为材料，采用双套盆法研究半淹水、全淹水胁迫（1 d 和3 d） 及恢复（1、3、5 d）对甜瓜幼苗呼吸等生理代谢的影响。结果表明：与进行常规水分管理的对照相比，淹水胁迫降低了甜 瓜幼苗根系鲜质量、干质量和根系活力，且全淹处理的抑制作用更加显著。淹水胁迫提高了无氧呼吸乳酸脱氢酶（LDH）和 乙醇脱氢酶（ADH）活性，降低了有氧呼吸苹果酸脱氢酶（MDH）和琥珀酸脱氢酶（SDH）活性，耐涝性较弱的世纪蜜的 降低幅度大于耐涝性稍强的脆禧；淹水胁迫后2 个品种中超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT） 活性总体呈升高趋势。因此，淹水胁迫使甜瓜幼苗有氧呼吸受到阻碍，同时促进了无氧呼吸代谢，最终导致根系生长受到抑 制，且世纪蜜受到抑制程度大于脆禧。

Effects of Waterlogging Stress and Stress Relieve on Respiration and Other Physiological Metabolisms of Melon Seedlings

Taking moderately stronger flood tolerant melon ‘Cuixi’ and relatively weaker flood tolerant melon‘ Shijimi’ as materials，this paper studied the effects of half submerged and total submerged（1，3 days） stress and stress relieve（1，3，5 days）on respiration and other physiological metabolism of melon seedlings． The results indicated that comparing with the contrast carrying out normal water management，waterlogging stress decreased the fresh weight，dry weight and activities of melon seedlings root system，and the inhibiting effect of total submerge treatment was more significant．Waterlogging stress increased the activities of lactate dehydrogenase（LDH）and alcohol dehydrogenase（ADH），reduced the activities of malate dehydrogenase （MDH）and succinate dehydrogenase（SDH）．The reducing scale of ‘Shijimi’ with relatively weaker flood tolerance was larger than that of ‘Cuixi’ with moderately stronger flood tolerance．The activities of superoxid dismutase（SOD），peroxidase（POD）and catalase（CAT）of these 2 varieties showed an increasing tendency after waterlogging stress．Therefore，waterlogging stress inhibited the aerobic respiration of melon seedlings， while accelerated the anaerobic respiration metabolism，eventually leading to restrain the root system growth． Moreover，the inhibition rate suffered by‘ Shijimi’ was larger than that of‘ Cuixi’．