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Articles by M. Ahsan
Total Records ( 6 ) for M. Ahsan
  M. Ahsan and D. Wright
  The experiment was conducted to compare two systems (hydroponic and soil culture). Seven wheat varieties differing in salt tolerance were grown under saline conditions (100 mol m–3 NaCl) in these two systems. Ion contents (Na+, K+, CI‾, Ca2+ and Mg2+ ) in the fourth leaf were not correlated with ion contents in the flag leaf. There were few significant correlation coefficients between ion contents and grain weight per plant. Which suggests that ion contents in leaf sap may not be good indicators of salt tolerance in wheat. Linear correlation coefficients for grain yield, most of yield components and ion contents of seven wheat varieties between hydroponic and soil culture were non-significant. These results suggest that hydroponic culture system is independent from soil culture system.
  M. Ahsan
  The present work consisted of six elite, exotic and local maize inbred lines and their all possible as well as reciprocal cross combinations. This values of coefficients of variation were found to be lower for all agronomic traits except grain yield per plant (22.83%). Genotypic correlation coefficients had higher magnitude than the phenotypic correlation coefficients. Phenotypic correlation coefficients were found to significant and positive between leaf area, leaf angle, number of leaves per plant, plant height and grain yield. They were found negative and significant between days taken to tasseling, days taken to silking and grain yield. However, it is concluded from these results that grain yield can be improved by increasing leaf angle, leaf area, number of leaves per plant and plant height.
  M. Ahsan and D. Wright
  Heterotic effects in spring wheat was investigated using the six basic generations (P1, P2, F1, F2 and back crosses, BC1 and BC2) of cross between Alexandria (salt sensitive) and KRL1-4 (salt tolerant) varieties. Heterotic effects were greatly pronounced as F1, means fall outside the parental range for all physiological and most of the agronomic traits except number of spikes per plant and average grain weight. The significantly different estimates of the dominance components in F2 for Na+, K+, K+/Na+ ratio, number grains per spikes and grain weight per spike than that obtained from F1 indicate spurious overdominance exhibited by the F1 generation for these traits. Gene dispersion or non-allelic interaction or involvement of modifier are suggested from the transgressive segregation in the F2 population. It is also suggested from the F2 population frequency distributions for all traits that they were quantitatively inherited.
  M. Ahsan and D. Wright
  Three wheat varieties (Kharchia-65, KRL 1-4and Alexandria) were tested for their salt tolerance at 125 mol m3 NaCl salinity. Inter- and intra-varietal variations in these wheat varieties were also investigated for ion contents (Na+, K+, CI), K+ /Na+ ratio, yield and yield components under saline conditions. Although environmental conditions were uniform , but variability within varieties was found to higher than the variability between varieties. KRL1-4 was found salt tolerant than Kharchia-65 and Alexandria under saline conditions. These inter-and intra-varietal variations suggested that improvement for salt tolerance might be achieved through selection from within already existing varieties and, or by crossing salt tolerant and salt sensitive wheat genotypes.
  M. Ahsan and D. Wright
  Effects of leaf age on ion uptake (Na+, K+ and CI‾) and K+/Na+ ratio were investigated using the three S1 wheat selections Alex-1, KRL-24 and Khar-1. Na+ and CI‾ contents were found to be increasing in the older leaves, but K+ content and K+/Na+ ratio were found to be decreasing in the younger leaves. However, it is suggested from the results that sampling should be done when leaves are fully expanded. Khar-1 was found to be intermediate between Alex-1 and KRL-24 in ion uptake and K+/Na+ ratio at three out of the four sampling dates. The considerable variation in Na+, K+, Cl‾ uptake and K+/Na+ ratio between sampling dates suggests that these traits might be less useful as selection criteria.
  M. Ahsan and M. Khalid
  Twelve S, selection, four from each of the three wheat varieties (Alexandria, Kharchia-65 and KRL1-4) were made on the bases of high and low K+/Na+ ratio and yield. These were tested to know the effects of selecting for these traits. The S, lines A-1 and A-24 which were selected on the basis of high and low K+/Na+ ratio were found significantly different for IC K+/Na+ ratio. Similarly, Kh-1 (high K+/Na+ ratio) and Kh-5 (low K+/Na+ ratio) were also found significantly different for K+/Na+ ratio. On the other hand, S, lines which were selected on the basis of high and low grain yield showed non significant differences. However, it is concluded from the results that high K+/Na+ ratio may be used as selection criteria for salt tolerance in wheat. Grain yield per plant and its components, showed no significant differences between plants with and without fourth leaf. It is suggested from these results that sampling of fourth leaf have no effects on the grain yield per plant and these can be included with plant without fourth leaf in yield comparison.
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