NDLI: Leaf senescence in tomato mutants as affected by irradiance and phytohormones

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Leaf senescence in tomato mutants as affected by irradiance and phytohormones

Content Provider	Semantic Scholar
Author	Carvalho, Rogério Falleiros Monteiro, Carolina Cristina Caetano, Antonio Cesar Dourado, Manuella Nóbrega Gratão, Priscila Lupino Haddad, Claudia Regina Baptista Peres, Lázaro Eustáquio Pereira Azevedo, Ricardo Antunes
Copyright Year	2013
Abstract	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.
Starting Page	749
Ending Page	757
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1007/s10535-013-0333-1
Volume Number	57
Alternate Webpage(s)	http://www.lcb.esalq.usp.br/publications/articles/2013/2013bpv57n4p749-757.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s10535-013-0333-1
Journal	Biologia Plantarum
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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