Responses of four arid zone grass species from varying habitats to drought stress
1995
Ashraf, M. | Yasmin, N. (Bahauddin Zakariya Univ., Multan (Pakistan). Inst. of Pure and Applied Biology)
The effects of 4 or 8 drought cycles on four grass species, Cenchrus pennisetiformis, Leptochloa fusca, Panicum turgidum, and Pennisetum divisum were assessed in a pot experiment. There were significant differences between the species in biomass production under water stress. C. pennisetiformis and P. turgidum produced significantly greater fresh and dry matter than P. divisum and especially than L. fusca. L. fusca had the lowest and P. divisum highest osmotic potentials compared with the other species after the completion of 4 or 8 drought cycles. Osmotic adjustment (difference between osmotic potential of droughted/rehydrated plants and control plants) was highest in L. fusca. The stomatal conductance was significantly decreased with increased drought stress in C. pennisetiformis. The elasticity of C. pennisetiformis, P. turgidum and P. divisum increased with increase in number of drought cycles, whereas that of L. fusca remained unchanged.
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