TOPOGRAPHIC AND EDAPHIC CONTROL OF ARBOREAL VEGETATION AND THE DISTRIBUTION AND GROWTH OF TREE SPECIES IN MOIST TEMPERATE AREAS OF HIMALAYAN AND HINDUKUSH REGIONS OF PAKISTAN

摘要

To explore high biomass producing salt tolerant cultivars of a potential forage crop barley (Hordeum vulgare L.), 30-day old plants of 105 different accessions from different origin were subjected to saline and non-saline (control) conditionsfor 45 days. Salinity stress (150 mM NaCl) markedly suppressed plant growth (shoot and/or root fresh and dry weights),chlorophyll pigments (a and b), internal CO2 concentration, stomatal conductance, rate of transpiration and photosynthesis,while a considerable salt-induced increase was observed in all fluorescence related attributes including efficiency ofphotosystem-II (Fv/Fm), co-efficient of non-photochemical quenching (QN), photochemical quenching (QP), and nonphotochemicalquenching (NPQ) in all 105 accessions of barley. The response of all 105 barley accessions to salt stressvaried significantly for all the morpho-physiological attributes determined in the present study. Overall, on the basis of shootand root dry weights, accessions, 4050, 4053, 4056, 4163, 4228, 4229, 4244, 4245, 4290, 4414, 4415, 4427, 4452, Mahali,Jesto, 4165, 4229, 4249, 4405, 4409, 4426, 4456, and Giza 123 were found superior while accessions, 4245, 4158, 4166,4246, 4406, 4423, 4441, 4442 4447, 4453 and 4458 inferior under saline conditions.