嫁接对低氧胁迫下黄瓜生长和生理代谢的影响  

Effects of Grafting on Growth and Physiological Metabolism in Cucumber Seedlings under Hypoxia Stress

作　　者：樊怀福[1] 郭世荣[1] 张润花[1] 栗娜娜[1] 崔聪聪[1] 杜长霞[1] 

机构地区：[1]南京农业大学园艺学院,江苏南京210095

出　　处：《园艺学报》2006年第6期1225-1230,共6页Acta Horticulturae Sinica

基　　金：国家自然科学基金资助项目(30170645)

摘　　要：采用营养液水培,以丝瓜为砧木,研究了嫁接对黄瓜植株生长、生理代谢和低氧耐性的影响。结果表明,以丝瓜嫁接黄瓜可明显提高黄瓜植株的低氧耐性,在低氧胁迫8d后,嫁接苗的株高、茎粗、鲜样质量、干样质量、叶绿素含量、根系活力、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、净光合速率(Pn)、胞间CO2浓度(Ci)、气孔导度(Gs)、蒸腾速率(Tr)均显著高于自根苗,而根系和叶片中超氧阴离子(O.2)产生速率显著低于自根苗。表明嫁接可明显提高黄瓜植株的低氧耐性,耐低氧性的提高与嫁接苗植株较高的抗氧化能力和光合速率密切相关。Effects of grafting on growth, physiological metabolism and hypoxia tolerance were studied in cucumber （ Cucumis sativus L. ） grafted on smooth luffa （Luffa cylindrica Roem. ） and grown in nutrient solution. The results showed that grafting significantly increased hypoxia tolerance of grafted cucumber seedlings. Plant height, stem thickness, fresh mass, dry mass of grafted seedlings and the activity of SOD, POD, CAT and APX in both leaves and roots of grafted seedlings were markedly higher than those grown on own-roots after 8 days of hydroponic hypoxia stress. Similarly, mot activity, the content of chlorophyll, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate were significantly higher than those grown on own-roots under hypoxia stress. However, the rate of O2^- production of grafted seedlings was lower than that grown on own-roots after 8 days of hydroponic hypoxia stress. The higher levels of antioxidation and higher photosynthetic rate may be involved in higher hypoxia tolerance of grafted seedlings.

关 键 词：黄瓜 嫁接 低氧胁迫 活性氧 光合特性 

分 类 号：S642.2[农业科学—蔬菜学]