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Title: Novel insights into biochemical and hormonal factors regulating floral transition in mango (Mangifera indica L.)
Authors: Bajpai, Y
Trivedi, M
Muthukumar, M
Bajpai, A
Keywords: Mangifera indica;alternate bearing;floral transition;biochemical factors;hormonal factors
Issue Date: Jan-2021
Publisher: NIScPR-CSIR, India
Abstract: Alternate or biennial bearing is an alternating pattern of large and small fruit yield occurring in consecutive years in mango, which is a major issue related to erratic productivity. This bearing behaviour is known to be regulated by internal physiological cues including biochemical and hormonal status of the adult shoots and accessibility to external stimulus that influences floral transition. This study aims to compile evidences to establish biochemical and hormonal patterning in floral transition utilizing standard protocols of colorimetric and transcriptomic studies. Floral tissues exhibited temporal pattern of higher accumulation of chlorophyll (0.40 to 0.99 mg gm-1 tissue in Chausa), total sugar (8.83 to 26.65 mg gm-1 tissue in Dashehari) and phenol content (0.21 to 0.83 mg gm-1 tissue in Dashehari), implying sufficient built-up of these in bud burst stage to be associated with floral morphogenesis. Furthermore higher accumulation of anthocyanins and auxin content with concomitant lower gibberellins in floral flush in all varieties validate the crosstalk among pathways to regulate the outcomes of floral transition. The genes sucrose synthase, sucrose phosphate synthase 1 (log 2 fold change value upto 4.98), ATP synthase, polyphenol oxidase and auxin response factor were found to be differentially expressed in the floral buds as observed by transcriptome data which corroborate the leads obtained by biochemical and hormonal assays. The study gives novel insights into the role of genes implicated in accumulation of carbohydrate reserves and establishment of hormonal gradients, that have decisive role in the flowering processes in mango.
Page(s): 54-64
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.20(1) [January 2021]

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