Proteomic analysis of heterosis in the leaves of sorghum-sudangrass hybrids

Acta Biochimica Et Biophysica Sinica
Pingan HanXiaoyu Zhang

Abstract

Sorghum-sudangrass hybrids are widely used for forage and silage in the animal husbandry industry due to their hardiness. The heterozygous first generation of sorghum-sudangrass hybrids displays performance superior to their homozygous, parental inbred lines. In order to study the molecular details underlying its heterosis, the leaves of sorghum-sudangrass hybrids and their parents were compared using mass spectrometry-based proteomics. Results showed that among the 996 proteins that were identified, 32 proteins showed 'additive accumulation expression patterns', indicating that the protein abundance in sorghum-sudangrass hybrids showed no significant difference from the average of their parents. Additionally, 74 proteins showed 'nonadditive accumulation expression patterns' (the proteins abundance in the hybrids showed significant difference from the average of their parents). Both additive and nonadditive proteins were mainly involved in photosynthesis and carbohydrate metabolism. More upregulated additive and nonadditive proteins were in the hybrids than in their parents, suggesting that additive and nonadditive proteins are essential to the vigor of sorghum-sudangrass hybrids. The nonadditive proteins were enriched in photo...Continue Reading

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