biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 57:749-757, 2013 | DOI: 10.1007/s10535-013-0333-1

Leaf senescence in tomato mutants as affected by irradiance and phytohormones

R. F. Carvalho1, C. C. Monteiro1, A. C. Caetano2, M. N. Dourado2, P. L. Gratão1, C. R. B. Haddad3, L. E. P. Peres2, R. A. Azevedo2,*
1 Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista "Júlio de Mesquita Filho", Jaboticabal, SP, Brazil
2 Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil
3 Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brazil

We explored the interaction between radiation of different wavelength and jasmonic acid (JA) or brassinosteroids (BR) on leaf senescence-induced oxidative stress. Three approaches were used: 1) jasmonic acid insensitive1-1 (jai1-1) and brassinosteroid-deficient [dumpy (dpy)] mutants were treated with red (R) or far-red (FR) radiation; 2) phytochromedeficient aurea (au) and high pigment-1 (hp-1) (radiation exaggerated response) mutants were treated with methyl jasmonate (MeJA) or epibrassinolide (epiBL); and 3) double mutants au jai1-1 and au dpy were produced. Leaf chlorophyll content, lipid peroxidation, and antioxidant enzyme activities were determined. After senescence induction in detached leaves, we verified that the patterns of chlorophyll degradation of hormonal and photomorphogenic mutants were not significantly different in comparison with original cv. Micro-Tom (MT). Moreover, there was no significant change in lipid peroxidation measured as malondialdehyde (MDA) production, as well as catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) activities in the hormonal mutants. Exogenous BR increased CAT and APX activities in MT, au, and hp-1. As concerns the double mutants, severe reduction in H2O2 production which was not accompanied by changes in MDA content, and CAT and APX activities was observed during senescence in au dpy. The results suggest that JA and BR do not participate in light signaling pathway during leaf senescence-induced oxidative stress.

Keywords: antioxidant enzymes; brassinosteroids; jasmonates; lipid peroxidation; oxidative stress; photomorphogenesis; Solanum lycopersicum
Subjects: senescence; mutants; irradiance; brassinosteroids; jasmonic acid; methyl jasmonate; ascorbate peroxidase; catalase; glutathione reductase; malondialdehyde; chlorophyll; superoxide dismutase; hydrogen peroxide; tomato

Received: November 22, 2012; Accepted: February 18, 2013; Published: December 1, 2013  Show citation

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Carvalho, R.F., Monteiro, C.C., Caetano, A.C., Dourado, M.N., Gratão, P.L., Haddad, C.R.B., Peres, L.E.P., & Azevedo, R.A. (2013). Leaf senescence in tomato mutants as affected by irradiance and phytohormones. Biologia plantarum, 57(4), 749-757. doi: 10.1007/s10535-013-0333-1
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