Seed Priming Mitigates the Salt Stress in Eggplant (Solanum Melongena) by Activating Antioxidative Defense Mechanisms

Jawaid, Muhammad Zaid; Khalid, Muhammad Fasih; Ahmed, Talaat

doi:10.2139/ssrn.4409509

Cited by 1 publication

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“…Collectively, these findings show severe unbalancing of ascorbate biosynthesis process under stress; its apparent decrease under heat, salt, and osmotic conditions seems to be a result of the slowdown of the L-galactose pathway and the excessive use of Asc for protecting plants from cellular injury, as proposed by Li and collaborators [61]. Since ascorbate biosynthesis is down-regulated by such stresses, which virtually may result in reduced endogenous Asc content, its exogenous application has been successfully employed to prevent oxidative stress and confer plant tolerance by restoring it and triggering crucial priming of adaptive responses [62,63]. In this sense, exogenous ascorbate improved cell turgidity, chlorophyll levels, and growth of strawberry plants subjected to heat [64].…”

Section: Discussionmentioning

confidence: 99%

Genome and Transcriptome Analyses of Genes Involved in Ascorbate Biosynthesis in Pepper Indicate Key Genes Related to Fruit Development, Stresses, and Phytohormone Exposures

Aguiar,

Dias,

Sousa

et al. 2023

Plants

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Pepper (Capsicum annuum L.) is a vegetable consumed worldwide, primarily used for vitamin C uptake and condiment purposes. Ascorbate (Asc) is a multifunctional metabolite, acting as an antioxidant and enzymatic cofactor involved in multiple cellular processes. Nevertheless, there is no evidence about the contribution of biosynthesis pathways and regulatory mechanisms responsible for Asc reserves in pepper plants. Here, we present a genome- and transcriptome-wide investigation of genes responsible for Asc biosynthesis in pepper during fruit development, stresses, and phytohormone exposures. A total of 21 genes, scattered in ten of twelve pepper chromosomes were annotated. Gene expression analyses of nine transcriptomic experiments supported the primary role of the L-galactose pathway in the Asc-biosynthesizing process, given its constitutive, ubiquitous, and high expression profile observed in all studied conditions. However, genes from alternative pathways generally exhibited low expression or were unexpressed and appeared to play some secondary role under specific stress conditions and phytohormone treatments. Taken together, our findings provide a deeper spatio-temporal understanding of expression levels of genes involved in Asc biosynthesis, and they highlight GGP2, GME1 and 2, and GalLDH members from L-galactose pathway as promising candidates for future wet experimentation, addressing the attainment of increase in ascorbate content of peppers and other crops.

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