PJB-2017-750
METHIONINE-INDUCED CHANGES IN GROWTH, GLYCINEBETAINE, ASCORBIC ACID, TOTAL SULUBLE PROTEINS AND ANTHOCYANIN CONTENTS OF TWO Zea mays L. VARIETIES UNDER SALT STRESS
Shagufta Perveen
Abstract
A pot experiment was conducted to explore the effect of foliar application of methionine on two maize (Zea mays L.) varieties DTC (hybrid) and Malika under salt (90 mM NaCl) stress. Salt treatment was applied in full strength Hoagland’s nutrient solution to 2-week-old maize plants, while foliar application of varying methionine levels (0, 25 and 50 mgL-1) was applied to 4-week-old plants. Data of 11-week-old maize plants showed that salt stress significantly decreased shoot and root fresh and dry weights, shoot and root lengths, total leaf area per plant, chlorophyll, relative water content (%), free amino acids and flavonoid contents, while increased membrane permeability (%), free proline, glycinebetaine (GB), total soluble proteins, ascorbic acid and anthocyanin contents of both maize varieties. Varieties showed significant difference as var. Malka was higher in root fresh weight, total leaf area per plant, total chlorophyll and total soluble protein contents, while DTC (hybrid) excelled in total soluble sugars, anthocyanin and flavonoid contents. Foliar application of methionine significantly increased shoot dry weight, root fresh weight, GB, total soluble protein, ascorbic acid and anthocyanin contents of both maize varieties under salt stress or non-stress conditions. Of the varying methionine levels, 50 mgL-1 proved better in reducing the adverse effect of salt stress of both maize varieties.
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