biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 43:387-391, 2000 | DOI: 10.1023/A:1026738225755

Acclimation Potential to High Irradiance of Two Cultivars of Watermelon

A. Calatayud1,*, V.I. Deltoro1, E. Alexandre2, E. Barreno1
1 Institut "Cavanilles" de Biodiversitat i Biología Evolutiva, Universitat de València, Facultat Ciències Biològiques, Burjassot (València), Spain e-mail
2 Estació Experimental Agraria de Carcaixent, Carcaixent (València), Spain

The acclimation potential to high irradiance of two cultivars of watermelon, Reina de Corazones and Toro, calculated as the ratio of sun vs. shade activities of O2- and H2O2 scavenging enzymes and non-radiative energy dissipation, was similar. However, Reina de Corazones exhibited a higher capacity in absolute terms for photoprotection (harmless dissipation of absorbed light energy at PS 2 and ascorbate and O2- and H2O2 scavenging enzymes) suggesting a larger resistance of this cultivar to high irradiance. This could be seen as smaller decreases in fruit productivity and in lower oxidative injury as probed by malondialdehyde content in sun plants of Reina de Corazones than in Toro plants. Additionally, the results show that shading might be beneficial to both cultivars, presumably because it reduces the susceptibility of high irradiance-induced stress.

Keywords: ascorbate; Citrullus lanatus; lipid peroxdation; non-photochemical quenching; productivity; scavenging enzymes
Subjects: acclimation to high irradiance, watermelon genotypes; chlorophyll fluorescence, non-photochemical quenching, acclimation to high irradiance; Citrullus lanatus; fluorescence, chlorophyll, non-photochemical quenching, acclimation to high irradiance; genotype differences, watermelon, acclimation to high irradiance; irradiance, high, acclimation; lipid peroxidation, acclimation to high irradiance; photoprotection, chlorophyll fluorescence; scavenging enzymes, acclimation to high irradiance; watermelon genotypes, acclimation to high irradiance

Published: September 1, 2000  Show citation

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Calatayud, A., Deltoro, V.I., Alexandre, E., & Barreno, E. (2000). Acclimation Potential to High Irradiance of Two Cultivars of Watermelon. Biologia plantarum, 43(3), 387-391. doi: 10.1023/A:1026738225755
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