Genome-wide analyses of the bHLH gene family reveals structural and functional characteristics in the aquatic plant Nelumbo nucifera

PeerJ

article

Tian-Yu Mao¹  Yao-Yao Liu¹  Huan-Huan Zhu¹  Jie Zhang¹  Ju-Xiang Yang¹  Qiang Fu¹  Nian Wang¹  Ze Wang¹ 

[1] Key Laboratory of Horticultural Plant Biology, College of Horticulture and Forestry Sciences, Huazhong Agriculture University;Key Laboratory of Urban Agriculture in Central China, Ministry of Agriculture and Rural Affairs

关键词: Lotus;    bHLH gene family;    Structural and evolutional analyses;    Functional prediction;    Stress;   

DOI  :  10.7717/peerj.7153

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Lotus (Nelumbo nucifera Gaertn.) is an economically important aquatic plant with multiple applications, but water salinity and cold stress seriously affect lotus yield and distribution. The basic helix-loop-helix (bHLH) transcription factors (TFs) play a vital role in plant growth and development, metabolic regulation processes and responses to environmental changes. However, systematic analyses of the bHLH TF family in lotus has not yet been reported. Here, we report the identification and description of bHLH genes in lotus (NnbHLHs) with a focus on functional prediction, particularly for those involved in stress resistance. In all, 115 NnbHLHs were identified in the lotus genome and classified into 19 subfamilies. The chromosomal distribution, physicochemical properties, bHLH domain, conserved motif compositions and evolution of these 115 NnbHLHs were further analyzed. To better understand the functions of the lotus bHLH family, gene ontology, cis-element, and phylogenetic analyses were conducted. NnbHLHs were predicted to be involved in plant development, metabolic regulation and responses to stress, in accordance with previous findings. Overall, 15 NnbHLHs were further investigated with functional prediction via quantitative real-time PCR analyses. Meanwhile, expression profiles of NnbHLHs in four tissues indicated that many NnbHLHs showed tissue preference in their expression. This study is supposed to provide a good foundation for further research into the functions and evolution of NnbHLHs, and identifies candidate genes for stress resistance in lotus.

【 授权许可】

CC BY