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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, Y.T.N. Reddy, S.R. Shivu Prasad, G.V. Bindu, H.L. Jayaram and 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 ( w) 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 w, 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 w. 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 w in mango buds to elicit flowering responses.
Not Available
 
Date 2019-02-22T07:43:05Z
2019-02-22T07:43:05Z
2013-01-01
 
Type Journal
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/17039
 
Language English
 
Relation Not Available;
 
Publisher Not Available