黄瓜感染白粉病菌后的生理变化  

Physiological Changes of Cucumber after Being Infected by Sphaerotheca fuliginea

作　　者：王惠哲[1] 李淑菊[1] 霍振荣[1] 庞金安[1] 

机构地区：[1]天津科润黄瓜研究所,天津300192

出　　处：《华北农学报》2006年第1期105-109,共5页Acta Agriculturae Boreali-Sinica

摘　　要：抗性不同的黄瓜品种接种白粉病菌后，对与抗性有关的光合作用、呼吸强度及叶绿索、可溶性糖、可溶性蛋白质的含量进行了测定。结果表明：抗病品种呼吸强度比对照明显升高，感病品种则低于对照；抗、中抗品种光合速率先升高，5～6d后开始下降，而感病品种的光合速率基本上低于对照，这与呼吸强度的变化相一致；无论抗病品种还是感病品种叶绿素含量均有增加，抗病品种增加幅度更大，说明黄瓜抗白粉病的能力与叶绿素含量呈正相关；接种后各品种糖含量的变化趋势基本一致，即降低-升高-再降低-再提高，而且均在第5d出现第1个峰值，第7d则出现最大幅度下降，可溶性糖含量明显低于对照，说明病菌的侵染消耗植株体内的糖，但并不能说明糖含量的降低与品种的抗病性密切相关；各黄瓜品种叶片可溶性蛋白质含量均高于对照，但感病品种比抗、中抗品种的峰值出现的要早，说明感病品种对病菌的侵染更敏感，品种的抗病性与对病菌侵染的反应呈负相关。The changes of photosynthesis, respiratory intensity, chlorophyll, soluble sugar and soluble protein content of 4 cucumber cuhivars with different resistance to Sphaerotheca fuliginea after inoculation were studied. The resuhs showed that, respiratory intensity of resistant varieties was apparently higher than control, while the susceptible group was lower. Photosynthesis and respiratory intensity of resistant varieties increased after inoculation, and decreased 5 - 6 days later, in susceptible variety it was lower than control. The chlorophyll content were improved both in the resistant and susceptible, the former had larger increase, and this content was correlated with disease resistance of the tested cucumber varieties. Trend of soluble sugar of each cuhivar after inoculation was similar with ＂decrease-increase-decrease-increase＂, the first apex appeared at the 5^th day, and the most decrease was occurred in the 7^th day after inoculation. The soluble sugar content of inoculated varieties was markedly lower than the control experiment. This illustrated that sugar in the plant was depleted after inoculation, but the correlation of sugar content decrease and disease resistance of cucumber was not proved. The soluble protein content of each variety has increased after inoculation, where the peak value happened earlier in resistant than susceptible ones. This indicated that the susceptible cuhivars were more sensitive to the pathogen than the resistance. Negative relationship was found between disease resistance and Sphaerotheca fuliginea infection response.

关 键 词：黄瓜 白粉病菌 生理变化 

分 类 号：S436.421[农业科学—农业昆虫与害虫防治]