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Diurnal and seasonal trends in photosynthetic performance of Dalbergia sissoo Roxb. and Hardwickia binata Roxb. from a semi-arid ecosystem



Diurnal and seasonal trends in photosynthetic performance of Dalbergia sissoo Roxb. and Hardwickia binata Roxb. from a semi-arid ecosystem



Photosynthetica 46(2): 248-254



Diurnal and seasonal trends in net photosynthetic rate (P-N), stomatal conductance (g), transpiration rate (E), vapour pressure deficit, temperature, photosynthetic photon flux density, and water use efficiency (WUE) were compared in a two-year-old Dalbergia sissoo and Hardwickia binata plantation. Mean daily maximum P-N in D. sissoo ranged from 21.40 +/- 2.60 mu mol m(2) s(-1) in rainy season I to 13.21 +/- 2.64 mu mol m(-2) s(-1) in summer whereas in H. binata it was 20.04 +/- 1.20 mu mol m(-2) s(-1) in summer and 13.64 +/- 0.16 mu mol m(-2) s(-1) in winter. There was a linear relationship between daily maximum P-N and g(s) in D. sissoo but there was no strong linear relationship between P-N and g(s) in H. binata. In D. sissoo, the reduction in g(s) led to a reduction in both P-N and E enabling the maintenance of WUE during dry season thereby managing unfavourable environmental conditions efficiently whereas in H. binata, an increase in g(s) causes an increase of P-N and E with a significant moderate WUE.

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Accession: 022448091

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DOI: 10.1007/s11099-008-0041-9



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