The roles of florigen and antiflorigen in physiology and development of tomato plants

• Ano de defesa: 2017
• Autor(a) principal: Moncaleano Robledo, kerly Jessenia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa
• Palavras-chave em Português: Tomate; Hormônios vegetais; Fisiologia vegetal; Fisiologia Vegetal
• Link de acesso: https://locus.ufv.br//handle/123456789/27552

The CETS gene family CENTRORADIALIS / TERMINAL FLOWER 1 / SELF- PRUNING, homologs in Antirrinum, Arabidopsis and tomato have been characterized by the control of the balance and regulation of the determined and indeterminate growth. Twelve paralogous genes were identified in tomatoes, classified into three clades: SELF-PRUNING (SP) –like floral development repressors, SINGLE FLOWER TRUSS (SFT) -like as flowering promoters and the third group MOTHER FLOWER TRUSS (MFT) involved in germination processes. The SP repressor gene of flowering or antiflorigenic is responsible for the growth determined in tomato, but the physiological basis is unknown. On the other hand, the FLOWERING LOCUS T (FT) orthologous SFT in Arabidopsis was described like promoter of flowering with fruit number regulation, growth habit and water use efficiency. However, the mechanism associated with the efficiency of water use has not been explained either. This work aimed at analyze the relationship of SP with auxin hormone associated with growth and development using allelic variations of SP in comparison with Diageotropica (DGT), mutant of auxin polar transport, and also to identify pleiotropic effects of SFT in leaves of tomato from allelic variations to SFT. We found that auxin free levels, auxin polar transport and gravitropic curvature of the shoot apex are all altered by SP. In addition, SP and DGT reciprocally affect AUX/IAA and ARF transcript accumulation in the sympodial meristem. Our results provide evidence of the relation SP and auxin and will allow to increase the understanding of the habit of growth. Subsequently, we show that SFT besides promoting changes in tomato growth and development, has pleiotropic effects on gas exchange and foliar anatomy. These results suggest a new function of the SFT gene and aid to the understanding of the role of SFT in leaf development