
	Pakistan Journal of Biological Sciences
	Year: 2003 \| Volume: 6 \| Issue: 4 \| Page No.: 317-321 DOI: 10.3923/pjbs.2003.317.321

Water Logging Tolerance in Populations of Cynodon dactylon from Contrasting Habitats

Habib-ur-Rehman Athar, Seema Mahmood, Rubina Shaheen and Muhammad Ashraf

Abstract: Two populations of Cynodon dactylon (Linn.) Pers., from contrasting habitats, were assessed for waterlogging tolerance. Tillers from each population were subjected to 3 (control), 18, 36, 54, 72 and 90 mg l^-1 Fe as Fe-EDTA in Rorison's nutrient solution for 21 days under controlled conditions. The results showed that addition of Fe to the growth medium had caused a significant inhibitory effect on fresh and dry matter of both grass populations. However, population from non-waterlogged habitat produced slightly greater shoot biomass than the waterlogged population in supplemented nutrient medium containing iron. Shoot K⁺ contents were significantly lower in waterlogged population at all external Fe regimes whilst, the two populations were not different for Ca²⁺ or Mg²⁺ contents of shoots. The waterlogged population accumulated significantly greater concentration of Mn in shoots. Likewise, individual plants sampled from waterlogged site exhibited greater N contents in their shoots as compared to the normal population. However, shoot P contents showed a non- significant decline in both populations under varying concentrations of iron. The normal population appeared to be more susceptible with respect to amino acids accumulation at higher concentrations of Fe. On the other hand, protein contents in shoots increased significantly in the normal populations at varying Fe regimes. It was concluded that the lack of tolerance to the excessive amounts of Fe in the waterlogged population was probably due to the absence adaptive mechanism, lack of suitable selection pressure and insufficient time for sorting of genotypes into that habitat.

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How to cite this article:

Habib-ur-Rehman Athar, Seema Mahmood, Rubina Shaheen and Muhammad Ashraf, 2003. Water Logging Tolerance in Populations of Cynodon dactylon from Contrasting Habitats. Pakistan Journal of Biological Sciences, 6: 317-321.

DOI: 10.3923/pjbs.2003.317.321

URL: https://scialert.net/abstract/?doi=pjbs.2003.317.321

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