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Changes in the antioxidant defense system and proline accumulation were examined at different growth stages (vegetative, boot and reproductive) in plants of two hexaploid spring wheat cultivars (S-24, salt tolerant; MH-97, salt sensitive), grown in hydroponics and salinity-affected with 0, 50, 100 and 150mM of NaCl. Salt stress provoked a marked decline in plant dry mass and ascorbic acid contents,...
To assess the role of selection pressure in plant adaptation to saline environment, a hydroponic experiment was conducted on six Panicum antidotale Retz. populations collected from a wide range of habitats with varying selection pressure in the form of soil salinity. The soil electrical conductivity of six different habitats ranged from 3.39 to 19.23dSm −1 and pH from 5.86 to 7.65. Plants...
To assess whether foliar application of K+S as potassium sulfate (K 2 SO 4 ) could alleviate the adverse effects of salt on sunflower (Helianthus annuus L. cv. SF-187) plants, a greenhouse experiment was conducted. There were two NaCl levels (0 and 150mM) applied to the growth medium and six levels of K+S as K 2 SO 4 (NS (no spray), WS (spray of water+0.1% Tween 20...
Naturally adapted salt tolerant populations provide a valuable material for exploring the adaptive components of salt tolerance. Under this aspect, two populations of Cynodon dactylon (L.) Pers. were subjected to salt stress in hydroponics. One was collected from a heavily salt-affected soil in the vicinity of a natural salt lake, Uchhali Lake, in the Salt Range of the Punjab province of Pakistan,...
Although water-limited environments are detrimental to cotton growth and productivity worldwide, identification of cotton (Gossypium hirsutum L.) genotypes that are less sensitive to drought may improve productivity in drought prone areas. The objective of the study was to assess genotypic variation for drought tolerance in cotton varieties using physiological attributes as selection criteria, and...
A greenhouse experiment was conducted to assess the effect of water stress on growth and metabolic changes in nodules and other plant parts of two leguminous species, Phaseolus vulgaris and Sesbania aculeata, with the major objective that nodules play a vital role in drought tolerance. Imposition of water deficit conditions for 45 days to 15-day-old plants of P. vulgaris and S. aculeata reduced shoot...
Undoubtedly, plant breeders have made a significant achievement in the past few years, improving salinity tolerance in a number of potential crops using artificial selection and conventional breeding approaches, although molecular biology approaches are currently being intensively pursued for achieving this goal. However, most of the selection procedures used so far, were based merely on differences...
Achenes of sunflower (cv Hi-Corn) were subjected for seven days to salinized solution culture containing 0, 50, 100 or 150 mol NaCl m −3 . Fresh weights of cotyledons and hypocotyl increased at all external salt regimes, although the increase was low at the highest salt level. Na + , Cl − and Ca 2+ concentrations in hypocotyls increased with time in all salt treatments...
A greenhouse experiment was conducted to assess the effect of salt stress on growth and metabolic changes in nodules and other plant parts of two leguminous species, Phaseolus vulgaris (salt sensitive) and Sesbania aculeata (salt tolerant) with the major objective if nodules play a vital role in salt tolerance. Plants of P. vulgaris subjected to 3.5 dS m −1 of NaCl and those of S. aculeata...
Nutrient relations in two spring wheat cultivars differing in salinity tolerance (Sarsabz, salt tolerant and Barani-83, salt sensitive) under sub-optimal and supra-optimal levels of nitrogen were examined in a glasshouse experiment. Twenty eight-day old plants of both the cultivars were subjected to five concentrations of 56, 112, 224, 336, and 448 mg N kg −1 soil for 42 days. Both cultivars...
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