Welcome to Bulletin of Botanical Research! Today is Share:

Bulletin of Botanical Research ›› 2006, Vol. 26 ›› Issue (1): 74-78.doi: 10.7525/j.issn.1673-5102.2006.01.017

Previous Articles     Next Articles

Physiological characteristics of photosynthesis in Iris lactea Pall. var. chinensis (Fisch.) Koidz grown in salt and alkali soil

SUN Guang-Yu;CAI Shu-Yan;HU Yan-Bo;FAN Chuan-Hui   

  1. College of Life Science, Northeast Forest University, Harbin 150040
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-01-20 Published:2006-01-20
  • Contact: SUN Guang-Yu
  • Supported by:

Abstract: 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).

Key words: Iris lactea Pall. var. chinensis(Fisch.) Koidz, net photosynthetic rate, water use efficiency, carboxylic efficiency, apparent quantum yield

CLC Number: