PJB-2008-38
RESPONSE OF WHEAT GENOTYPES TO DEFICIENT AND ADEQUATE LEVELS OF PHOSPHORUS
MUHAMMAD YASEEN, SUMREEN SIDDIQ, NADIA MANZOOR AND MUHAMMAD SOHAIL
Abstract
Response of wheat genotypes to deficient and adequate levels of phosphorus was studied in solution culture. Substantial differences in growth parameters such as total plant dry matter (TDM), shoot dry matter (SDM), root dry matter (RDM), root: shoot ratio and some phosphorus related parameters were obvious at deficient and adequate P levels. TDM ranged from 0.89 to 1.51 and 1.56 to 2.25 g 2 plants-1 at deficient and adequate P levels, respectively. Genotype 91773 produced almost double the SDM of Pasban at deficient P level while 90640 produced the highest RDM at adequate P level. Differences in SDM indicate that more than 50 % of genotypes produced SDM less than the mean average shoot dry matter at both the P levels. Only three genotypes 89626, 90627 and 91773 showed a phosphorus stress factor (PSF) ≤ 30 %. However RDM was higher at deficient P level than that at adequate P level. It is also obvious from high root: shoot ratio of wheat genotype at deficient phosphorus level in the growth medium. Significant differences for P uptake, absorption rate and utilization rates were also in wheat genotypes at deficient and adequate P levels. A significantly positive correlation with root dry matter (r = 0.698**, p< 0.01) suggested greater P uptake due to greater root biomass at deficient P level. Specific absorption rate also varied significantly among genotypes at adequate level. Specific utilization rate (SUR) was reduced by increasing P supply in the growth medium. Maximum SUR was observed in Inqlab 91 and minimum in Pasban and line 88678. Results showed existence of genetic differences among wheat genotypes with regard to P absorption and utilization. This information may provide useful basis for their selection under field conditions.
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