Perspectives of using Potassium on Agronomic, Bio Chemical and Yield Parameters of selected Cotton Varieties under Combined Stress of Salinity and Boron
Muhammad Aftab1*, Aneela Riaz2, Ghulam Sarwar3, Muhammad Arif1, Qudsia Nazir1, Ifra Saleem1, Sarfraz Hussain1, Abid Ali4, Abid Niaz1, Fakhar Mujeeb4, Khalid Mahmood5 and Sarfraz Nawaz6
Salt stress interrelates with other stresses as boron toxicity. However, the mechanism involve in salinity-boron interaction is still not well known. This research was carried out to evaluate the plants tolerance under combined stress of B and salt. In combined stresses of (B and Salt) causes oxidative stress in plants due to increase in production of the reactive oxygen species (ROS) including hydroxyl radicals (OH-), hydrogen peroxide (H2O2) and superoxide (O2-). However, on their side, efficient antioxidant defense system developed in plants, which having lower molecular weight of antioxidants. It also reduces (ROS) enzymatic activities including catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD). Under combined stress conditions agronomic, bio-chemical, quality and over all yield reduces, which is an alarming situation for agriculture sector. To assess the K effect on bio-chemical and agronomic characteristics of selected cotton crop varieties, a lysimeter study was carried out under combined stresses(Salinity and B) conditions. There were two varieties of cotton crop used in this research, such as, 1) FH-114, which was tolerant, and 2) NIAB-846 was sensitive to B-salinity stress. Sodium Chloride (NaCl) and Boric acid (H3BO3) were used to produce salinity and boron toxicity alone or in combined form and potassium (K) was applied as (K2SO4). K has helpful role under combined stresses (B and salinity) to improve cotton yield. According to the results, the agronomic and growth parameters improved by the application of K. But the toxicity of salinity-boron badly affects the yield and growth parameters in stresses conditions.
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