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Radiation use and stomatal behaviour of three tropical forage legumes

  • Wang Li
  • , Yang Yunfei*
  • , Liu Jinxiang
  • , Ma Fang
  • *Corresponding author for this work
  • Northeast Normal University
  • Harbin Institute of Technology
  • Lingnan Normal University

Research output: Contribution to journalArticlepeer-review

Abstract

Three promising tropical forage legumes, Cratylia argentea, Flemingia macrophylla and Desmodium velutinum were evaluated in a tropical monsoon environment in Hainan Province, China. D. velutinum had higher net photosynthetic rate (PN) and water use efficiency (WUE) than the other two species, and photosynthetic performance was consistent with their stomatal conductance (gs). Responses in gs to increasing photosynthetically active radiation (PAR) showed two phases. Light was the main trigger for opening stomata at low light intensity (0-400 μmol quanta/m 2/s), as was a reduction in intercellular CO2 (C i). Indirect actions contributed more to stomatal behaviour than the direct effect of light at intermediate to intense light intensity (400-2000 μmol quanta/m2/s), with water status being the major factor that controlled stomatal behaviour. D. velutinum was more affected by vapour pressure deficit (VPD) feedback regulation in intense light, and less by Ci at low light intensity than were the other two species.

Original languageEnglish
Pages (from-to)231-236
Number of pages6
JournalTropical Grasslands
Volume40
Issue number4
StatePublished - Dec 2006

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