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The Quest for Golden Bananas: Investigating Carotenoid Regulation in a Fe’i Group Musa Cultivar
journal contribution
posted on 2016-04-03, 00:00 authored by Stephen Buah, Bulukani Mlalazi, Harjeet Khanna, James
L Dale, Cara L MortimerThe
regulation of carotenoid biosynthesis in a high-carotenoid-accumulating
Fe’i group Musa cultivar, “Asupina”,
has been examined and compared to that of a low-carotenoid-accumulating
cultivar, “Cavendish”, to understand the molecular basis
underlying carotenogenesis during banana fruit development. Comparisons
in the accumulation of carotenoid species, expression of isoprenoid
genes, and product sequestration are reported. Key differences between
the cultivars include greater carotenoid cleavage dioxygenase 4 (CCD4) expression in “Cavendish” and the conversion
of amyloplasts to chromoplasts during fruit ripening in “Asupina”.
Chromoplast development coincided with a reduction in dry matter content
and fruit firmness. Chromoplasts were not observed in “Cavendish”
fruits. Such information should provide important insights for future
developments in the biofortification and breeding of banana.
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fruit firmnessproduct sequestrationCarotenoid Regulationisoprenoid genesGolden BananasMusaAsupinaFecarotenoid speciesCavendishSuch informationcarotenoid biosynthesiscultivarCCD 4Key differencesexpressionChromoplastbanana fruit developmentmatter contentcarotenoid cleavage dioxygenase 4future developments
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