Genome-Wide Analysis Elucidates the Roles of Genes in Different Abiotic Stresses and Growth and Development Stages in the Peanut ( L.).

The lateral organ boundaries domain () genes, as the plant-specific transcription factor family, play a crucial role in controlling plant architecture and stress tolerance. However, the functions of genes in the peanut plant ( L.) remain unclear. In this study, 73 were identified in the peanut plant and divided into three groups by phylogenetic tree analysis. Gene structure and conserved protein motif analysis supported the evolutionary conservation of . Tandem and segment duplications contributed to the expansion of . The evolutionary relationship analysis of gene family between and four other species indicated that the peanut plant had a close relationship with the soybean plant. played a very important role in response to growth and development as well as abiotic stress. Furthermore, gene expression profiling and real-time quantitative qRT-PCR analysis showed that , , , and were candidate genes for salt stress, while , , , , , and were candidate genes for drought stress. Our subcellular localization experiment revealed that , , , and were located in the nucleus. Heterologous overexpression of and in significantly enhanced tolerance to salt stress. Our results provide a theoretical basis and candidate genes for studying the molecular mechanism for abiotic stress in the peanut plant.