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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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Characterization of vegetative inflorescence (mc-vin) mutant provides new insight into the role of MACROCALYX in regulating inflorescence development of tomato