%0 Journal Article
%A SUN Guang-Yu
%A CAI Shu-Yan
%A HU Yan-Bo
%A FAN Chuan-Hui
%T Physiological characteristics of photosynthesis in <em>Iris lactea</em> Pall. var. <em>chinensis</em> (Fisch.) Koidz grown in salt and alkali soil
%D 2006
%R 10.7525/j.issn.1673-5102.2006.01.017
%J Bulletin of Botanical Research
%P 74-78
%V 26
%N 1
%X The experiment was conducted to determine diurnal changes of net photosynthetic rate (<em>Pn</em>), transpiration rate (<em>Tr</em>), stomatal conductance (<em>Gs</em>), water use efficiency (<em>WUE</em>), and environmental factors in <em>Iris lactea</em> Pall. var. <em>chinensis</em> (Fisch.) Koidz grown in salt-alkali soil. The data acquired in this study showed that diurnal changes of <em>Pn</em> and <em>Tr</em> were two-peak-type-curve and were marked by a midday depression of <em>Pn</em>, which could be fully accounted for by <em>Gs</em> changes. Carboxylic efficiency (<em>CE</em>), photosynthetic rate at saturation for intercellular CO<sub>2</sub> concentration (A<sub>350</sub>)，apparent quantum yield (<em>AQY</em>), and photosynthetic rate at light saturation (<em>P</em><sub>max</sub>) 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 (<em>PAR</em>).
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2006.01.017