Discrimination Against 13CO2 in Leaves, Pod Walls, and Seeds of Water-stressed Chickpea
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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.
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- Atkins, C.A., Pate, J.S.: An IRGA technique to measure CO2 content of small volumes of gas from internal atmospheres of plant organs.-Photosynthetica 11: 214-216, 1977.Google Scholar
- Ehleringer, J.R., Hall, A.E., Farquhar, G.D.: Stable Isotopes and Plant-Carbon Water Relations.-Academic Press, San Diego 1993.Google Scholar
- Sheoran, I.S., Singal, H.R., Singh, R.: Photosynthetic characteristics of chickpea (Cicer arietinum L.) pod wall during seed development.-Indian J. exp. Biol. 25: 843-847, 1987.Google Scholar
- Winter, K.: CO2 and water vapour exchange, malate content and δ13C value in Cicer arietinum grown under two water regimes.-Z. Pflanzenphysiol. 101: 421-430, 1981.Google Scholar