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Expansion of banana ( Musa acuminata ) gene families involved in ethylene biosynthesis and signalling after lineage‐specific whole‐genome duplications
Author(s) -
Jourda Cyril,
Cardi Céline,
MbéguiéAMbéguié Didier,
Bocs Stéphanie,
Garsmeur Olivier,
D'Hont Angélique,
Yahiaoui Nabila
Publication year - 2014
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.12710
Subject(s) - genome , gene , biology , musa acuminata , gene duplication , lineage (genetic) , genetics , ethylene , gene family , botany , biochemistry , catalysis
Summary Whole‐genome duplications ( WGD s) are widespread in plants, and three lineage‐specific WGD s occurred in the banana ( Musa acuminata ) genome. Here, we analysed the impact of WGD s on the evolution of banana gene families involved in ethylene biosynthesis and signalling, a key pathway for banana fruit ripening. Banana ethylene pathway genes were identified using comparative genomics approaches and their duplication modes and expression profiles were analysed. Seven out of 10 banana ethylene gene families evolved through WGD and four of them (1‐aminocyclopropane‐1‐carboxylate synthase ( ACS ), ethylene‐insensitive 3‐like ( EIL ), ethylene‐insensitive 3‐binding F‐box ( EBF ) and ethylene response factor ( ERF )) were preferentially retained. Banana orthologues of At EIN 3 and At EIL 1 , two major genes for ethylene signalling in Arabidopsis, were particularly expanded. This expansion was paralleled by that of EBF genes which are responsible for control of EIL protein levels. Gene expression profiles in banana fruits suggested functional redundancy for several Ma EBF and Ma EIL genes derived from WGD and subfunctionalization for some of them. We propose that EIL and EBF genes were co‐retained after WGD in banana to maintain balanced control of EIL protein levels and thus avoid detrimental effects of constitutive ethylene signalling. In the course of evolution, subfunctionalization was favoured to promote finer control of ethylene signalling.