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Hormonal changes in response to paclobutrazol induced early flowering in mango cv. Totapuri

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Title Hormonal changes in response to paclobutrazol induced early flowering in mango cv. Totapuri
Not Available
 
Creator Kaushal K Upreti, YTN Reddy, SR Shivu Prasad, GV Bindu, HL Jayaram, Shailendra Rajan
 
Subject Abscisic acid, Cytokinins, Mango, Gibberellins, Paclobutrazol
 
Description Not Available
Paclobutrazol has been found predominantly effective in the induction of early flowering and thus finding scope for off-season production in mango. The precise physiological mechanism regulating early floral induction is meagerly understood. The objective of the study was to examine the hormonal relationships associated with floral induction in mango following paclobutrazol treatment. The paclobutrazol applied as soil drench, @ 3.0 ml/m canopy diameter during the 3rd week of August advanced fruit harvest period by 22 days as compared to untreated trees by promoting early flowering. The C:N ratio in shoots, leaf water potential (ψw) and ABA content in the paclobutrazol untreated and treated trees increased progressively as shoots approached bud break stage. There was increase in C:N ratio and leaf ψw, by the paclobutrazol with drastic increase at the bud break. C:N ratio in shoot was positively related to ABA content in buds. Cytokinins – zeatin (Z), zeatin riboside (ZR) and dihydrozeatin riboside (DHZR) in buds increased consistently from 30 days before bud break till floral bud initiation. In paclobutrazol treated trees, increase in ZR and DHZR contents in buds were positively related to leaf ψw. GA4, GA3, GA7 and GA1 were the prominent GAs in the leaves and buds. In buds, these gibberellins followed trends opposite to that of cytokinins. The paclobutrazol treatment declined GA4, GA3, GA7 and GA1 contents both in leaves and buds; with buds being more receptive to paclobutrazol treatment. These results implicated that paclobutrazol besides affecting gibberellins also increases ABA and cytokinin contents concomitant with C:N ratio and leaf ψw in mango buds to elicit flowering responses.
Not Available
 
Date 2017-10-16T05:25:43Z
2017-10-16T05:25:43Z
2013-01-01
 
Type Research Paper
 
Identifier 26
ISSN: 0304-4238
http://krishi.icar.gov.in/jspui/handle/123456789/5472
 
Language English
 
Relation Not Available;
 
Publisher Elsevier