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Articles by R. H. Qureshi
Total Records ( 3 ) for R. H. Qureshi
  M. A. Naeem , R. H. Qureshi , M. Aslam , R. Ahmad , N. Ahmad , A. Hussain , M. Saleem and K. Hussain
  In order to determine genetic diversity of NRI against NaCl salinity, a study in hydropnic system was carried out with 60 plants of NRI at 70 ml m-3 NaCl salinity. Plants were grown up to maturity and on the basis of growth and paddy yield, the plant population of NR-I was divided into five tolerance classes and corresponding values of K+, Na+, Cl-, K:Na and P:Zn ratio were averaged and relationships of these parameters with the salt-tolerance character was evaluated. The study revealed that salt tolerance of various population groups was correlated with the exclusion of Na+ and Cl-, better maintenance of K+, high K:Na and low P:Zn ratios in the leaves. The chemical composition of leaves depends upon the age of the leaf.
  M. A. Naeem , R. H. Qureshi , M. Aslam and R. Ahmad
  Salt tolerance is a complex phenomenon and external Zn:P ratio seems to be related to the salinity tolerance of rice. A study on two rice lines with varying salinity tolerance was conducted in solution culture with different enternal Zn:P ratios in the presence (70 mol m-3 NaCl) and absence of NaCl salinity. A high Zn concentration under saline conditions as compared to in the normal Yoshida nutrient solution was required for better yield. Better growth of rice under different external Zn:P ratios was apparently related to the ionic composition of the leaf sap: there was an inverse relationship with moderately high Zn concentration (Zn:P ratio of 2.1000) in the external medium and the concentration of Na+ and Cl, P and Ca2+, and a positive relationship with K+ and Zn concentrations. It also improved the K+:Na+ ratios in the leaf.
  Javaid Akhtar , A. Shahzad , R. H. Qureshi , A. Naseem and K. Mahmood
  A pot experiment was conducted to see the effect of salinity and waterlogging on five wheat genotypes. The experiment consisted of four treatments i.e., control (non-saline non-waterlogged), waterlogging, saline and salinity×waterlogging. NaCI salinity was developed prior to sowing and waterlogging was created two weeks after germination. At booting stage fully expanded second to flag leaf was collected for Na+, K+ and Cl– analysis. At harvesting grain and straw yield was recorded. The genotypes SARC-6 and Pasban-90 were found to be tolerant producing high grain and straw yield under all treatments. SARC-6 was able to manage the high concentration of Na+ and Cl– while Pasban-90 accumulated low Na+ and Cl– concentration possibly due to exclusion of these ions. The sensitive genotype SARC-5 produced low yield and could not manage the high concentration of Na+ and Cl–.
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