Differential growth behaviour of selected wheat genotypes for phosphorus deficiency stress tolerance I: Growth characteristics
2000
Yaseen, M. | Hussain, T. (University of Agriculture, Faisalabad (Pakistan). Dept. of Soil Science)
Response of genotypes was measured in terms of shoot (SDM) and root (RDM) dry matter weights, root-shoot ratio and relative SDM, P concentration. Relative reduction in SDM ranged from none to 54 per cent. Genotypes with none or little influence of P deficiency stress on SDM were Kohinoor-83, Pb.85, Parvaz-94 and 4770. Highly P responsive genotypes includes Faisalabad-83, Chakwal-86, Pasban-90, 4072, 4943, 5039, 6529-11 and 6544-6. Differences in SDM exhibited the presence of genetic variation among wheat genotypes under P deficient conditions. There was 29 per cent increase in SDM with increase in P supply. Phosphorus supply levels significantly affect the root dry matter. High RDM at rock-P level indicated adaptation to the P stress. This was also clear from high root-shoot ratio at this P level. Genotypes with high root-shoot ratio showed better adaptation to low P conditions. Except Pak.81 and Parvaz-94 all the other wheat genotypes had greater ratio at rock-P than at adequate P level.
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