摘要
【背景】外来入侵恶性杂草——三裂叶豚草在我国迅速蔓延,并对我国经济、人民健康、生态等方面造成巨大影响。【方法】本文运用光合仪(CIRAS-1)测定豚草锈菌侵染后的三裂叶豚草叶片的光合效率、蒸腾速率、叶表面蒸汽压差、胞间CO2浓度、气孔导度等指标,以探讨豚草锈菌影响三裂叶豚草光合作用的机制。【结果】豚草锈菌侵染三裂叶豚草叶片后,对叶片水分代谢与光合代谢有明显影响,从而影响叶片有机物质的合成。豚草锈菌侵染显症1～4d后,受侵染叶片蒸腾速率与气孔导度下降,光合作用有所加强,导致胞间CO2浓度下降,进而使叶片细胞水分代谢与光合代谢加强。显症4d后,随着叶片发病程度增加(4～5级),胞间CO2浓度增加,蒸腾速率与气孔导度大幅降低,光合速率下降。【结论与意义】豚草锈菌能干扰三裂叶豚草叶片的光合生理活动。该结果可为防治三裂叶豚草提供参考。
[ Background] At present, the alien invasive weed--Ambrosa trifida L. is rapidly spreading in China, with grave conse- quences on economy, ecology, and human health. [ Method] In order to study the influence of the rust （Puccinia xanthii L sp. ambrosiae-trifidae） infection on photosynthetic characters of giant ragweed, photosynthesis rate （Pn）, transpiration rate （Tr）, vapor deficit at the leaf surface （Vpd）, intercellular CO2 concent rations （Ci）, and stomatal conductance （Gs） were measured on indi- viduals with photosynthesis measuring system of （CIRAS-1）. [ Result ] After infection with the rust, Pn increased, while Ci, Tr, Vpd, Gs decreased in the leaves from 1 to 4 days after the disease symptoms appeared. During this period, disease severity rised from one to three degree. From 5 to 9 days after the disease apparition, Pn, Tr, Vpd, Gs decreased, meanwhile, disease severity rised from grade four to grade five. [ Conclusion and significance ] We found Clear evidence that P. xanthii f. sp. ambrosiae-trifidae disturbs the photosynthetic ability of ragweed leaves. This agent merits further study as a potential biological control organism of the giant ragweed.
出处
《生物安全学报》
2011年第3期227-231,共5页
Journal of biosafety
基金
国家自然科学基金项目(30871651)
关键词
三裂叶豚草
豚草锈菌
光合生理特性
生物防治
病菌影响
生理学
Ambrosia trifida
Puccinia xanthii f. sp. ambrosiae-trifidae
photosynthetic characteristics
biological control
pathogen-ic effects
physiology
