MAINTENANCE OF TURGOR IN RESPONSE TO DROUGHT IN SCHIMA WALLICHII AND QUERCUS SEMECARPIFOLIA AT PHULCHOWKI HILL, KATHMANDU, NEPAL
Journal Title: Journal of Biological and Scientific Opinion - Year 2013, Vol 1, Issue 3
Abstract
In the central Himalaya, plants are subjected to a prolonged dry period, thus developing moisture stress. Maintenance of turgor, tissue water relations and response to drought were studied at Phulchowki Hill, Kathmandu, Nepal by pressure-volume curve analysis in two Himalayan tree species (Schima wallichii at 1400 m elevation, and Quercus semecarpifolia at 2130 m). Variations were found for turgor maintenance in these two species. Both osmotic potential at zero turgor (sz) and osmotic potential at full turgor (sf) declined in dry months and decline was greater in the summer months of 1999 when pre monsoon rain was negligible. Q. semecarpifolia showed high osmotic adjustment at sz, –2.45 MPa than S. wallichii (̶ 1.24 MPa). Similarly osmotic adjustment at sf was –1.89 MPa in Q. semecarpifolia, and –1.07 MPa in S. wallichii. Pressure potential at full turgor (pf) was also high in Q. semecarpifolia (2.18 MPa) in the dry month. Comparatively, S. wallichii showed elastic adjustment with high elasticity of cell walls while Q. semecarpifolia had rigid cell walls. Q. semecarpifolia lost turgor at 76 ̶ 95 % relative water content while S. wallichii at 66 – 89 %. Among these two species S. wallichii maintained turgor by both elastic and osmotic adjustments while Q. semecarpifolia showed osmotic adjustment for the maintenance of turgor during the dry months and showed high drought tolerance.
Authors and Affiliations
Kanta , Poudyal
Keywords
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- EP ID EP87853
- DOI 10.7897/2321-6328.01302
- Views 154
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