PJB-2018-1715
Enhancement in cotton growth and yield using novel growth promoting substances under water limited conditions
Mudassir Aziz, Muhammad Ashraf and Muhammad Mansoor Javaid
Abstract
To investigate the role of different growth promoting substances including glycine betaine, salicylic acid and ascorbic acid individually and in different combinations on the growth and yield of promising cotton cultivars viz. Lalazar and FH-142 under limited water supply, a pot study was conducted at research farm of University College of Agriculture, University of Sargodha, Sargodha. Two watering regimes viz. well watered (normal irrigation condition) and irrigation at 60 % field capacity level (drought condition) was maintained at appearance of first true leaf of the cotton plant. Exogenous application of different plant growth regulators (PGRs) on two cotton cultivars (Lalazar and FH-142) included: distilled water spray (control), distilled water spray + tween-20 (0.1%), glycine betaine @ 100 mg L-1 + tween-20 (0.1%), salicylic acid @ 100 mg L-1 + tween-20 (0.1%), ascorbic acid at 100 mg L-1 + tween-20 (0.1 %), glycine betaine and salicylic acid @ 50 mg L-1 each + tween-20 (0.1%), glycine betaine and ascorbic acid @ 50 mg L-1 each + tween-20 (0.1%), salicylic acid and ascorbic acid @ 50 mg L-1 each + tween-20 (0.1%), glycine betaine + salicylic acid + ascorbic acid @ 33 mg L-1 each + tween-20 (0.1%). Results indicated that different plant growth regulators significantly affected number of days to squaring, number of days to first boll splitting, number of monopodial and sympodial branches per plant, number of main stem nodes per plant, plant height, height to node ratio, membrane stability index, relative water contents, first fruiting branch node number, first fruiting branch node height, number of open bolls per plant, average boll weight, lint yield, cotton seed yield per plant and GOT (%). Yield attributes of cotton were enhanced with combined application of salicylic acid and ascorbic acid each at 50 mg L-1 each under drought conditions. However, above stated yield and yield attributes were enhanced with exogenous application of glycine betaine, salicylic acid and ascorbic acid each at 33 mg L-1 under normal irrigation conditions. FH-142 is suitable for good production under drought conditions with the tested PGRs
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