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甜瓜果实感病后呼吸强度和乙烯释放量均呈增加趋势,果腔内二氧化碳、乙烯、乙醛、乙醇和乙酸乙酯的浓度也随之升高,这些变化因病原物不同而有差异。呼吸强度和乙烯释放量以病斑部位和邻近病斑0.5cm处组织最高;同一病斑部位果皮的呼吸强度和乙烯释放量明显高于果肉。过氧化物酶的活性与甜瓜组织抗病性呈正相关,与各种病原菌对甜瓜果实的致病力呈负相关。在侵染部位过氧化物酶活性显著增加,感病组织中出现了新的过氧化物同工酶带。
Respiratory intensity and ethylene release of melon fruits showed an increasing trend after induction of illness, and the concentration of carbon dioxide, ethylene, acetaldehyde, ethanol and ethyl acetate in the fruit cavity also increased accordingly. These changes varied according to the pathogen. Breathing intensity and ethylene release were the highest at 0.5cm in lesion and adjacent lesion; respiration and ethylene emission in pericarp of the same lesion were significantly higher than that of pulp. Peroxidase activity was positively correlated with the disease resistance of melon tissue, and negatively correlated with the pathogenicity of various pathogens on the melon fruit. Peroxidase activity increased significantly in infected sites, and new peroxidase isozymes bands appeared in susceptible tissues.