Enhanced transpiration rate in the high pigment 1 tomato mutant and its physiological significance

Autor(es)

Carvalho, R. F. ^[1] ; Aidar, S. T. ^[1] ; Azevedo, R. A. ^[2] ; Dodd, I. C. ^[3] ; Peres, L. E. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Ciencias Biol, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Dept Genet, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Lancaster, Lancaster Environm Ctr, Lancaster - England

• Tipo de documento: Artigo Científico
• Fonte: Plant Biology; v. 13, n. 3, p. 546-550, MAY 2011.
• Citações Web of Science: 11

Resumo

Tomato high pigment (hp) mutants represent an interesting horticultural resource due to their enhanced accumulation of carotenoids, flavonoids and vitamin C. Since hp mutants are known for their exaggerated light responses, the molecules accumulated are likely to be antioxidants, recruited to deal with light and others stresses. Further phenotypes displayed by hp mutations are reduced growth and an apparent disturbance in water loss. Here, we examined the impact of the hp1 mutation and its near isogenic line cv Micro-Tom (MT) on stomatal conductance (gs), transpiration (E), CO(2) assimilation (A) and water use efficiency (WUE). Detached hp1 leaves lost water more rapidly than control leaves, but this behaviour was reversed by exogenous abscisic acid (ABA), indicating the ability of hp1 to respond to this hormone. Although attached hp1 leaves had enhanced gs, E and A compared to control leaves, genotypic differences were lost when water was withheld. Both instantaneous leaf-level WUE and long-term whole plant WUE did not differ between hp1 and MT. Our results indicate a link between exaggerated light response and water loss in hp1, which has important implications for the use of this mutant in both basic and horticultural research. (AU)

• Processo FAPESP: 03/12416-5 - Estudo da interação entre fitocromo e hormônios vegetais no controle do desenvolvimento
• Beneficiário: Rogério Falleiros Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado