Melatonin alleviates low PS I‐limited carbon assimilation under elevated CO₂ and enhances the cold tolerance of offspring in chlorophyll b‐deficient mutant wheat

Abstract

Melatonin is involved in the regulation of carbohydrate metabolism and induction of cold tolerance in plants. The objective of this study was to investigate the roles of melatonin in modulation of carbon assimilation of wild-type wheat and the Chl b-deficient mutant ANK32B in response to elevated CO 2 concentration ([CO 2 ]) and the transgenerational effects of application of exogenous melatonin (hereafter identified as melatonin priming) on the cold tolerance in offspring. The results showed that the melatonin priming enhanced the carbon assimilation in ANK32B under elevated [CO 2 ], via boosting the activities of ATPase and sucrose synthesis and maintaining a relatively higher level of total chlorophyll concentration in leaves. In addition, melatonin priming in maternal plants at grain filling promoted the seed germination in offspring by accelerating the starch degradation and improved the cold tolerance of seedlings through activating the antioxidant enzymes and enhancing the photosynthetic electron transport efficiency. These findings suggest the important roles of melatonin in plant response to future climate change, indicating that the melatonin priming at grain filling in maternal plants could be an effective approach to improve cold tolerance of wheat offspring at seedling stage. K E Y W O R D Schlorina mutants, elevated CO 2 , low temperature, seed quality, transgenerational effect | INTRODUCTION

Exogenous melatonin enhances salt stress tolerance in maize seedlings by improving antioxidant and photosynthetic capacity

“…It has been shown that melatonin can preserve chlorophyll and improve the photosynthetic efficiency in plants under stressful conditions (Yin et al , Zhao et al , Jiang et al , Li et al ). Consistent with these findings, our results indicated that 100 μM melatonin application significantly improved the levels of qP and ΦPSII under NaCl stress (Fig.…”

PTEN inhibition attenuates endothelial cell apoptosis in coronary heart disease via modulating the AMPK–CREB–Mfn2‐mitophagy signaling pathway

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Melatonin‐deficient rice plants show a common semidwarf phenotype either dependent or independent of brassinosteroid biosynthesis

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