摘要
研究了盐碱地生长的马蔺叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和水分利用效率(WUE)以及环境因素的日变化。结果表明,马蔺叶片Pn和Tr均呈现双峰曲线,具有光合午休现象。这种现象出现的原因是由于较高的太阳辐射引起叶片温度的升高,叶片的羧化效率(CE)和表观量子产额(AQY)的下降造成的。
The experiment was conducted to determine diurnal changes of net photosynthetic rate （Pn）, transpiration rate （ Tr）, stomatal conductance （Gs）, water use efficiency （ WUE）, and environmental factors in Iris lactea Pall. var. chinensis （Fisch.） Koidz grown in salt-alkali soil. The data acquired in this study showed that diurnal changes of Pn and Tr were two-peak-type-curve and were marked by a midday depression of Pn, which could be fully accounted for by Gs changes. Carboxylic efficiency （CE）, photosynthetic rate at saturation for intercellular CO2 concentration （A350 ）, apparent quantum yield （AQY）, and photosynthetic rate at light saturation （Pmax） all decreased at midday. The results indicated that the midday depression could be attributed to the rising leaf temperature caused by increased strong solar radiation （PAR）.
出处
《植物研究》
CAS
CSCD
北大核心
2006年第1期74-78,共5页
Bulletin of Botanical Research
基金
黑龙江省重大项目(GA02B601)
黑龙江省重点项目(GB03B601)
哈尔滨市重点项目(2004AA6CN142)
关键词
马蔺
净光合速率
水分利用效率
羧化效率
表观量子产额
Iris lactea Pall. var. chinensis （Fisch.） Koidz
net photosynthetic rate
water use efficiency
carboxylic efficiency
apparent quantum yield
