AI Article Synopsis
- The 'Aurea' mutant, a yellow-green leaf variant of an ornamental woody species, was created through Co-γ irradiation, but its molecular mechanisms are still unclear.
- By conducting RNA sequencing, researchers identified 3,372 differentially expressed genes (DEGs) between the mutant and its normal green counterpart, with significant changes in several biological processes linked to pigment biosynthesis and chloroplast function.
- The study suggests that the altered pigment production in the mutant is a result of imbalanced chlorophyll and carotenoid levels, prompting the activation of alternative metabolic pathways to mitigate photodamage from disrupted chloroplasts.
Article Abstract
'Aurea' is a yellow-green leaf () mutant and originated from Schrenk by Co-γ irradiation, which is an important ornamental woody species. However, the molecular mechanism of the mutant remains unknown. Herein, comparative transcriptome profiling was performed between the type and normal green color type (WT) by RNA sequencing. A total of 3,372 significantly differentially expressed genes (DEGs) were identified, consisting of 1,585 upregulated genes and 1,787 downregulated genes. Genes that took part in metabolic of biological process (1,090), membrane of cellular component (728), catalytic (1,114), and binding of molecular function (840) were significantly different in transcription level. DEGs involved in chlorophyll biosynthesis, carotenoids biosynthesis, cutin, suberine, wax biosynthesis, photosynthesis, chloroplast development, photosynthesis-antenna proteins, photosystem I (PSI) and photosystem II (PSII) components, CO fixation, ribosomal structure, and biogenesis related genes were downregulated. Meanwhile, linoleic acid metabolism, siroheme biosynthesis, and carbon source of pigments biosynthesis through methylerythritol 4-phosphate (MEP) pathways were upregulated. Moreover, a total of 147 putative transcription factors were signification different expression, involving NAC, WRKY, bHLH, MYB and AP2/ERF, C2H2, GRAS, and bZIP family gene. Our results showed that the disturbed pigments biosynthesis result in color by altering the ratio of chlorophylls and carotenoids in mutants. The mutants may evoke other metabolic pathways to compensate for the photodamage caused by the insufficient structure and function of chloroplasts, such as enhanced MEP pathways and linoleic acid metabolism against oxidative stress. This research can provide a reference for the application of leaf color mutants in the future.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8987444 | PMC |
| http://dx.doi.org/10.3389/fpls.2022.845662 | DOI Listing |
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