灰霉病菌侵染对黄瓜叶片光合作用和PSII光化学活性的影响

Effect of Botrytis cinrea infection on photosynthetic activities and photosynthetic apparatus in leaves of cucumber infected by Botrytis cinrea were studied by measurements of gas exchange and analysis of the fast polyphasic chlorophyll a fluorescence transient. The photosynthetic rate and stomatal conductance decreased and intercellular CO2 concentration enhanced. So the decrease of the photosynthetic rate was because of the decrease of photosynthetic activities in mesophyllic cells. The electron transport of photosynthetic apparatus is blocked and oxygen evolving complexs are injured by the analysis of the fast polyphasic chlorophyll a fluorescence transient. The decline of PSⅡ photochemistry activities are mainly due to the blocked electron transport and injury of the oxygen evolving complexs. Also, the blocked electron transport and injury of the oxygen evolving complexs are one of the causes that induce the decrease of photodynthetic capacity in leaves of cucumber.