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Characterization of vegetative inflorescence (mc-vin) mutant provides new insight into the role of MACROCALYX in regulating inflorescence development of tomato.
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Characterization of vegetative inflorescence (mc-vin) mutant provides new insight into the role of MACROCALYX in regulating inflorescence development of tomato.
Yuste-Lisbona, Fernando
[Centro de investigacion en biotechnologica agroalimentaria, Universidad de Almeria]
Quinet, Muriel
[UCL]
Fernandez-Lozano, Antonia
[Centro de investigacion en biotechnologica agroalimentaria, Universidad de Almeria]
Pineda, Benito
[Instituto de biologica molecular y celular de plantas, Universidad politecnica de Valencia]
Moreno, Vincente
[Instituto de biologica molecular y celular de plantas, Universidad politecnica de Valencia]
Angosto, Trinidad
[Centro de investigacion en biotechnologica agroalimentaria, Universidad de Almeria]
Lozano, Rafael
[Centro de investigacion en biotechnologica agroalimentaria, Universidad de Almeria]
Inflorescence development is a key factor of plant productivity, as it determines flower number. Therefore, understanding the mechanisms that regulate inflorescence architecture is critical for reproductive success and crop yield. In this study, a new mutant, vegetative inflorescence (mc-vin), was isolated from the screening of a tomato (Solanum lycopersicum L.) T-DNA mutant collection. The mc-vin mutant developed inflorescences that reverted to vegetative growth after forming two to three flowers, indicating that the mutated gene is essential for the maintenance of inflorescence meristem identity. The T-DNA was inserted into the promoter region of the MACROCALYX (MC) gene; this result together with complementation test and expression analyses proved that mc-vin is a new knock-out allele of MC. Double combinations between mc-vin and jointless (j) and single flower truss (sft) inflorescence mutants showed that MC has pleiotropic effects on the reproductive phase, and that it interacts with SFT and J to control floral transition and inflorescence fate in tomato. In addition, MC expression was mis-regulated in j and sft mutants whereas J and SFT were significantly up-regulated in the mc-vin mutant. Together, these results provide new evidences about MC function as part of the genetic network regulating the development of tomato inflorescence meristem.
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Bibliographic reference
Yuste-Lisbona, Fernando ; Quinet, Muriel ; Fernandez-Lozano, Antonia ; Pineda, Benito ; Moreno, Vincente ; et. al. Characterization of vegetative inflorescence (mc-vin) mutant provides new insight into the role of MACROCALYX in regulating inflorescence development of tomato.. In: Scientific Reports, Vol. 6, p. 18796 (2016)