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Comparative transcriptome profiling of freezing stress responses in loquat (Eriobotrya japonica) fruitlets

文献类型: 外文期刊

作者: Xu, Hong-xia 1 ; Li, Xiao-ying 1 ; Chen, Jun-wei 1 ;

作者机构: 1.Zhejiang Acad Agr Sci, Inst Hort, Hangzhou 310021, Zhejiang, Peoples R China

关键词: Differentially expressed gene;Freezing stress;Fruitlet;Loquat;Transcriptome

期刊名称:JOURNAL OF PLANT RESEARCH ( 影响因子:2.629; 五年影响因子:2.926 )

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收录情况: SCI

摘要: Loquat (Eriobotrya japonica Lindl.) is an important subtropical, commercial fruit in China. It blossoms during autumn and winter in most areas of China and its fruitlets usually suffer from freezing stress. However, studies about the mechanisms underlying freezing stress in loquat are very limited. The gene expression profiles of loquat fruitlets subjected to freezing (G2 library) versus non-treated ones (G1 library) were investigated using Illumina sequencing technology to elucidate the molecular mechanisms and identify the genes that play vital roles in the freezing stress response. The results showed that approximately 157.63 million reads in total were obtained from freeze-treated and non-treated loquat fruitlets. These reads were assembled into 87,379 unigenes with an average length of 710 bp and an N50 of 1,200 bp. After comparing the profiles obtained from the G1 and G2 libraries, 2,892 differentially expressed genes were identified, of which 1,883 were up-regulated and 1,009 were down-regulated in the treated samples compared to non-treated ones. These unigenes showed significant differences in expression for carbohydrate transport and metabolism, amino acid metabolism, energy metabolism, and lipid metabolism, which are involved in defense against freezing stress. Glycolysis/gluconeogenesis was one of the most significantly regulated pathways. Freezing also significantly damaged the membrane system of loquat fruitlets, and several defense mechanisms were induced. Some selected genes related to low temperature resistance were validated by quantitative real-time PCR (qRT-PCR). The results revealed many genes and pathways that are part of freezing resistance processes and expand our understanding of the complex molecular events involved in freezing stress.

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