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Transcriptome changes in the developing sugarcane culm associated with high yield and early-season high sugar content
Thursday, 2022/05/26 | 08:15:55

Virginie PerloGabriel R. A. MargaridoFrederik C. BothaAgnelo FurtadoKatrina Hodgson-KratkyFernando H. Correr & Robert J. Henry

Theoretical and Applied Genetics May 2022; Vol. 135: 1619–1636

Abstract

Sugarcane, with its exceptional carbon dioxide assimilation, biomass and sugar yield, has a high potential for the production of bio-energy, bio-plastics and high-value products in the food and pharmaceutical industries. A crucial challenge for long-term economic viability and environmental sustainability is also to optimize the production of biomass composition and carbon sequestration. Sugarcane varieties such as KQ228 and Q253 are highly utilized in the industry. These varieties are characterized by a high early-season sugar content associated with high yield. In order to investigate these correlations, 1,440 internodes were collected and combined to generate a set of 120 samples in triplicate across 24 sugarcane cultivars at five different development stages. Weighted gene co-expression network analysis (WGCNA) was used and revealed for the first time two sets of co-expressed genes with a distinct and opposite correlation between fibre and sugar content. Gene identification and metabolism pathways analysis was used to define these two sets of genes. Correlation analysis identified a large number of interconnected metabolic pathways linked to sugar content and fibre content. Unsupervised hierarchical clustering of gene expression revealed a stronger level of segregation associated with the genotypes than the stage of development, suggesting a dominant genetic influence on biomass composition and facilitating breeding selection. Characterization of these two groups of co-expressed key genes can help to improve breeding program for high fibre, high sugar species or plant synthetic biology.

 

See: https://link.springer.com/article/10.1007/s00122-022-04058-3

 

Fig. 2: Differentially expressed genes between different development stages, with stage 1: internode 5, first collection, stage 2: internode 5, first collection, stage 3: internode 5, second collection, stage 4: internode 8, second collection and stage 5: internode Ex-5, second collection. A First collection (19 weeks), B second collection (37 weeks). C Differentially expressed genes comparison between different stages of development. Reference conditions are displayed with a dot

 

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