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Photosynthetica

, Volume 38, Issue 1, pp 155–157 | Cite as

Discrimination Against 13CO2 in Leaves, Pod Walls, and Seeds of Water-stressed Chickpea

  • M.H. Behboudian
  • Q. Ma
  • N.C. Turner
  • J.A. Palta
Article

Abstract

The rate of photosynthesis (P N) in leaves and pods as well as carbon isotope content in leaves, pod walls, and seeds was measured in well-watered (WW) and water-stressed (WS) chickpea plants. The P N, on an area basis, was negligible in pods compared to leaves and was reduced by water stress (by 26%) only in leaves. WS pod walls and seeds discriminated less against 13CO2 than did the controls. This response was not observed for leaves as is usually the case. Pod walls and seeds discriminated less against 13CO2 than did leaves in both WW and WS plants. Measurement of carbon isotope composition in pods may be a more sensitive tool for assessing the impact of water stress on long-term assimilation than is the instantaneous measurement of gas exchange rates.

Cicer arietinum gas exchange photosynthesis water potential δ13

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • M.H. Behboudian
    • 1
  • Q. Ma
    • 2
  • N.C. Turner
    • 1
  • J.A. Palta
    • 1
  1. 1.Institute of Natural Resources, College of SciencesMassey UniversityPalmerston NorthNew Zealand
  2. 2.Centre for Mediterranean Agricultural ResearchCSIRO Plant IndustryAustralia

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