Abstract
The effectiveness of phosphorus (P), potassium (K), indole-3-acetic acid (IAA), gibberellic acid (GA3), zeatin (Z) and their combinations on chlorophyll a, b and total chlorophyll production was investigated in the hydroponic nutrient solution. The cotton plants were cropped without hormones application in different levels of P and K in the first cropping and with hormones application in the second cropping in high level of PK. In the first cropping, low K and high PK significantly influenced formation of chlorophyll a, b and ab from 83 to 91 days after planting (DAT) while the application of GA3, IAA, Z and IAA x GA3 x 2Z treatments significantly increased chlorophyll a, b and ab only at 80 DAT. However, two cotton varieties planted in two cropping seasons expressed different abilities in time to promote chlorophyll formation.
Highlights
Plant hormones have been known to regulate the physiological process in plant
Cytokinins is one of the plant hormones known to promote greening in plants using light as a final step catalyzed by nicotinamide adenine dinucleotide www.ccsenet.org/jas phosphate (NADPH) (Koski et al, 1951; Griffiths 1978; Apel et al, 1980; Yoshiki et al 2003)
Effect of phosphorus (P), potassium (K) and PK treatments on cotton chlorophyll a, b and ab production grown in hydroponics nutrients solution
Summary
Plant hormones have been known to regulate the physiological process in plant. It is well documented that cucumber plant (Cucumis sativus cv Brumex) pretreated in the dark with cytokinins promote chlorophyll formation during subsequent continuous illumination. Several workers have reported that cytokinin effect on chlorophyll formation in light depends on the length of time of dark preincubation with cytokinins (Fletcher and McCullagh, 1971; Ford et al, 1977; Uheda and Kuraishi, 1977; Dei and Tsuji, 1978). Cytokinins (zeatin) is one of the plant hormones known to promote greening (chlorophyll synthesis) in plants using light as a final step catalyzed by nicotinamide adenine dinucleotide www.ccsenet.org/jas phosphate (NADPH) (Koski et al, 1951; Griffiths 1978; Apel et al, 1980; Yoshiki et al 2003)
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