The increase in salinity of the medium resulted in the decrease c~-amylase and protease activities in all cotton varieties tested, however it was more pronounced in NIAB-86. Decrease in concentration of reducing and non-reducing sugars, slower mobilization of reserve protein and reduced amino acidslevels were observed with increase in salinity levels. However, varieties K-115 showed better performance than others. The variety K-115 also had a capacity to mobilization and had higher levels of sugars, total free amino acids and reserve protein during germination and early seedling growth stages. However, varieties K-115 showed better performance than others. Variety K-115 showed highest germination followed by NIAB--Karishma and NIAB-86. The variety K-115 also had a capacity to mobilization and had higher levels of total free amino acids and less reserve protein during germination and early seedling growth stages.
Water culture experiments were conducted to study the response of ten wheat genotypes to external K application (10 mmol KCI dm _ 3 ) at seedling stage under saline condition (0 and 100 mmol NaCl dm _ 3 ). The data showed that there was an increase in the shoot and root length with the application of external K. The increase was more pronounced under control than under saline conditions. The better performing genotypes under two treatments were Bhitai, NIAB-41, NIAB-I076 and Khirman. The enhanced growth of these genotypes under saline condition might be due to the quick response to external K application, resulting in high K/Na ratio. The results indicated that the genotypes, which have the ability of enhanced K/Na discrimination, might perform better under saline conditions when sufficient potassium is applied in the rooting medium.
Acacia ampliceps Maslin and Eucalyptus camaldulensis Dehnh. were grown for one year in lysimeters at three soil moisture regimes: 100 % (well-watered), 75 % (medium-watered) and 50 % (low-watered) of total plant available water. Biomass yield of both species increased with increase in soil moisture. Water-use efficiency (WUE) of E. camaldulensis decreased and that of A. ampliceps increased markedly with decrease in available soil moisture. A. ampliceps showed 4 -5 times more biomass yield than E. camaldulensis grown at similar soil moisture. A. ampliceps showed almost 5, 9 and 12 times higher WUE than E. camaldulensis under low-, medium-and well-watered treatments, respectively. Significant negative correlation of δ 13 C with WUE (r = -0.99) was observed in A. ampliceps. In contrast, δ 13 C of E. camaldulensis showed a significant positive correlation with WUE (r = 0.82).Additional key words: biomass production, plant available soil water, transpiration efficiency.
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