Control of water-use efficiency by florigen

Autor(es)

Robledo, Jessenia M. ^[1] ; Medeiros, David ^[1] ; Vicente, Mateus H. ^[2] ; Azevedo, Aristea A. ^[1] ; Thompson, Andrew J. ^[3] ; Peres, Lazaro E. P. ^[2] ; Ribeiro, Dimas M. ^[1] ; Araujo, Wagner L. ^[1] ; Zsogon, Agustin ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Vicosa, Dept Biol Vegetal, BR-36570900 Vicosa, MG - Brazil

^[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencias Biol LCB, Lab Hormonal Control Plant Dev, Piracicaba - Brazil

^[3] Cranfield Univ, Cranfield Soil & Agrifood Inst, Cranfield, Beds - England

• Tipo de documento: Artigo Científico
• Fonte: PLANT CELL AND ENVIRONMENT; v. 43, n. 1, p. 76-86, JAN 2020.
• Citações Web of Science: 0

Resumo

A major issue in modern agriculture is water loss through stomata during photosynthetic carbon assimilation. In water-limited ecosystems, annual plants have strategies to synchronize their growth and reproduction to the availability of water. Some species or ecotypes of flowers are early to ensure that their life cycles are completed before the onset of late season terminal drought ({''}drought escape{''}). This accelerated flowering correlates with low water-use efficiency (WUE). The molecular players and physiological mechanisms involved in this coordination are not fully understood. We analyzed WUE using gravimetry, gas exchange, and carbon isotope discrimination in florigen deficient (sft mutant), wild-type (Micro-Tom), and florigen over-expressing (SFT-ox) tomato lines. Increased florigen expression led to accelerated flowering time and reduced WUE. The low WUE of SFT-ox was driven by higher stomatal conductance and thinner leaf blades. This florigen-driven effect on WUE appears be independent of abscisic acid (ABA). Our results open a new avenue to increase WUE in crops in an ABA-independent manner. Manipulation of florigen levels could allow us to produce crops with a life cycle synchronized to water availability. (AU)

• Processo FAPESP: 16/05566-0 - Impacto da arquitetura vegetal do tomateiro (Solanum lycopersicum l.) sobre a produtividade, eficiência do uso da água e resistência aos estresses por seca e salinidade
• Beneficiário: Mateus Henrique Vicente
• Linha de fomento: Bolsas no Brasil - Doutorado