http://oar.icrisat.org/id/eprint/7398 2018-08-21T04:56:47Z info:eu-repo/semantics/descriptiveMetadata http://oar.icrisat.org/7398/ Complex and shifting interactions of phytochromes regulate fruit development in tomato Gupta, Suresh Kumar Sharma, S Santisree, P Kilambi, H V Appenroth, K Sreelakshmi, Y Sharma, R Agriculture-Farming, Production, Technology, Economics Tomato fruit ripening is a complex metabolic process regulated by a genetical hierarchy. A subset of this process is also modulated by light-signaling, as mutants encoding negative regulators of phytochrome signal transduction, show higher accumulation of carotenoids. In tomato phytochromes are encoded by a multi-gene family, namely PhyA, PhyB1, PhyB2, PhyE and PhyF, however, their contribution to fruit development and ripening has not been examined. Using single phytochrome mutants- phyA, phyB1 and phyB2 and multiple mutants- phyAB1, phyB1B2 and phyAB1B2, we compared the on-vine transitory phases of ripening till fruit abscission. The phyAB1B2 mutant showed accelerated transitions during ripening with shortest time to fruit abscission. Comparison of transition intervals in mutants indicated a phase-specific influence of different phytochrome species either singly or in combination on the ripening process. Examination of off-vine ripened fruits indicated that ripening specific carotenoid accumulation was not obligatorily dependent on light and even dark incubated fruits accumulated carotenoids. The accumulation of transcripts and carotenoids in off-vine and on-vine ripened mutant fruits indicated a complex and shifting phase-dependent modulation by phytochromes(s). Our results indicate that in addition to regulating carotenoid levels in tomato fruits, phytochrome(s) also regulate the time required for phase transitions during ripening. John Wiley & Sons 2013 Article PeerReviewed application/pdf en http://oar.icrisat.org/7398/1/Pre-print_Guptaetal_Complex%20_2013.pdf Gupta, Suresh Kumar and Sharma, S and Santisree, P and Kilambi, H V and Appenroth, K and Sreelakshmi, Y and Sharma, R (2013) Complex and shifting interactions of phytochromes regulate fruit development in tomato. Plant, Cell & Environment. pp. 1-57. ISSN 1365-3040 http://dx.doi.org/10.1111/pce.12279 10.1111/pce.12279 info:eu-repo/semantics/objectFile info:eu-repo/semantics/humanStartPage