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Comparative Water Relations of Quercus acuta and Castanopsis cuspidata var. sieboldii in Early Winter

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2005, v.28 no.4, pp.231-235



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Abstract

Quercus acuta and Castanopsis cuspidata var. sieboldii wereanalyzed to assess their resistance to drought and low temperature stresses from early November to early December. As air temperature decreased both species showed an increased content of osmotically active solute concentraton per unit of dry weight (Ns/DW), leading to lower osmotic potential of both species at both full turgid state (OPsat) and turgor los point (OPtlp) in December than November. No major diference in the ability to adjust osmotically was noticed between the two. This finding suggests that both species must respond adaptively under water and low temperature stresses to maintain turgor pressure in winter season. In addition to osmotic adjustment, a low bulk modulus of elasticity (Emax) shown in Castanopsis cuspidata var. sieboldii must also play an important role in turgor maintenance during winter season being apt to happen water and low temperature stresses in plants.

keywords
Castanopsis cuspidata var. sieboldii, Drought resistance, Low temperature stress, Osmotic adjustment, Quercus acuta, Castanopsis cuspidata var. sieboldii, Drought resistance, Low temperature stress, Osmotic adjustment, Quercus acuta

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