PMID: 32515355Jun 10, 2020Paper

Contrasting the expression pattern change of polyamine oxidase genes and photosynthetic efficiency of maize (Zea mays L.) genotypes under drought stress.

Journal of Biosciences
Hadis PakdelFrancoise Bernard

Abstract

The aim of this study was to contrast the effects of drought stress on polyamine oxidases gene expression and activity as well as photosynthetic efficiency in relatively tolerant (Karoon) and sensitive (260) maize genotype. d Reduction in leaf relative water content as a result of drought led to increase in root growth, but diminished shoot growth indices. Under drought stress, activity of antioxidant enzyme, catalase, significantly increased in both genotypes, whereas significant higher activity of superoxide dismutase and peroxidase was only observed in Karoon genotype. Expression of polyamine oxidase (PAO) genes (zmPAO1, zmPAO2, zmPAO3, zmPAO4, zmPAO5, zmPAO6) and activity of enzymatic polyamine oxidation was increased in both genotypes under drought stress. The enhancement in PAO gene expression and enzyme activity was more prominent in Karoon cultivar compared to 260. Chlorophyll a fluorescence and fast induction kinetics were negatively influenced by drought stress. These parameters were more affected in 260 cultivar compared with Karoon. Our results suggest that under drought stress, higher activity of polyamine oxidase pathway in backconversion of Spermine and spermidine to putrescine (protectant of photosynthetic appar...Continue Reading

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