ArticlePlanta2024
Comparative transcriptomic analysis unveils candidate genes associated with sugarcane growth rate.
Article in Planta, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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9 authors.
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Abstract
Sugarcane (Saccharum spp.) growth is regulated by intricate gene networks and hormone secretions, positively correlating with sugarcane yield. There is a rising interest in exploring how the candidate genes found in sugarcane respond to plant growth. In this study, we simulated a typical growth environment to obtain accurate phenotypic data and screened for potential genes associated with plant growth through transcriptomics. Compared to Saccharum GuiTang 42, the other variety Saccharum GuiTang 44 exhibited earlier germination, a higher emergence rate, thicker pseudostems, taller plants, and a more extensive root system. The middle buds formed the greatest number of roots, followed by the lower and upper buds. Indole-3-acetic acid (IAA) and jasmonic acid effectively promoted bud development, while abscisic acid and trans-zeatin exhibited negative correlations with sugarcane bud growth. Transcriptome data from the upper, middle, and lower buds revealed 24,158 differentially expressed genes in all three comparisons, with MAPK signaling emerging as a critical pathway. The photosynthesis-antenna protein pathway is vital for middle and lower bud development during root germination. Lastly, key gene modules related to differences in hormone content between the two varieties were defined through weighted correlation network analysis and identified. The module significantly associated with IAA was enriched in pathways such as Proteasome and Protein processing in the endoplasmic reticulum, and the upregulation of key genes involved in this gene module had a highly significant positive correlation with bud outgrowth combined with IAA secretion. In conclusion, we have elucidated the pathways of hormones during sugarcane growth and the interactions between IAA and critical genes. These in-depth findings may guide modern sugarcane breeding.
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