Samson B.M. Chimphango , Dunja MacAlister , John B.O. Ogola , A. Muthama Muasya
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引用次数: 0
Abstract
Non-structural carbohydrates (NSC) are major substrates for primary and secondary plant metabolism with various functions including growth, storage of carbon (C) and energy, osmotic adjustment and synthesis of antioxidants for defence against biotic and abiotic stresses. The allocation of C to growth and defence molecules is labelled antagonistic because it is perceived that limited photosynthates produced under stress is allocated preferentially to defence molecules at the expense of growth, leading to the development of the growth-defence trade-off concept. Several studies and literature reviews have provided evidence both in support and against the growth-defence trade-off. Therefore, it remains unclear whether the allocation of NSC to storage and defence molecules is at the expense of plant growth, especially in annual or short-lived flowering plants. This article reviews literature on sugar and antioxidant metabolism in tolerant/desi and sensitive/kabuli genotypes of chickpea under drought and heat stress conditions. The results show that some of the desi genotypes and drought and heat stress tolerant genotypes accumulated greater NSC, proline or antioxidant enzymes and produced higher biomass and seed yield than kabuli and sensitive genotypes under stress. This is new evidence to support the view that plants accumulate NSC and secondary metabolites and grow at the same time under drought and heat stress conditions which implies complementary allocation of C to growth and defence metabolism. Understanding the growth-defence trade-off and its application is important as it affects plant growth, seed yield, and plant fitness in both natural ecosystems and crop improvement programmes in agriculture.
期刊介绍:
The Journal of Plant Physiology is a broad-spectrum journal that welcomes high-quality submissions in all major areas of plant physiology, including plant biochemistry, functional biotechnology, computational and synthetic plant biology, growth and development, photosynthesis and respiration, transport and translocation, plant-microbe interactions, biotic and abiotic stress. Studies are welcome at all levels of integration ranging from molecules and cells to organisms and their environments and are expected to use state-of-the-art methodologies. Pure gene expression studies are not within the focus of our journal. To be considered for publication, papers must significantly contribute to the mechanistic understanding of physiological processes, and not be merely descriptive, or confirmatory of previous results. We encourage the submission of papers that explore the physiology of non-model as well as accepted model species and those that bridge basic and applied research. For instance, studies on agricultural plants that show new physiological mechanisms to improve agricultural efficiency are welcome. Studies performed under uncontrolled situations (e.g. field conditions) not providing mechanistic insight will not be considered for publication.
The Journal of Plant Physiology publishes several types of articles: Original Research Articles, Reviews, Perspectives Articles, and Short Communications. Reviews and Perspectives will be solicited by the Editors; unsolicited reviews are also welcome but only from authors with a strong track record in the field of the review. Original research papers comprise the majority of published contributions.