关键词:花生; 转录因子; NAC; 等位变异 Allelic Variation of Transcription Factor Genes NAC4 in Arachis Species LI Wen, WAN Qian, LIU Feng-Zhen*, ZHANG Kun, ZHANG Xiu-Rong, LI Guang-Hui, WAN Yong-Shan State Key Laboratory of Crop Biology / Shandong Key Laboratory of Crop Biology / College of Agronomic Sciences, Shandong Agricultural University, Tai’an 271018, China
AbstractNAC transcription factors play an important role in response to abiotic stress of plant. In this paper, bioinformatic analysis indicated that transcription factor gene AhNAC4(accession number HM776131.1) can response to drought signal. The comparison of cDNAs ( ShrNAC4-a and ShrNAC4-b) and genomic DNAs ( ShNAC4-a and ShNAC4-b) from Shanhua 11 showed that AhNAC4 has a full length of 1244 bp and an ORF of 1050 bp, containing two introns at 182-279 bp and 547-642 bp, and encoding 349 amino acids. Four kinds of AhNAC4 genes, named as AhNAC4-a1, AhNAC4-a2, AhNAC4-b1, and AhNAC4-b2(abbreviations: a1, a2, b1, and b2), were cloned from 32 cultivars with different drought resistances. Among them a1 and a2 were alleles, with only one locus different between the two genes, leading to the difference of corresponding amino acids at site 174; b1 and b2 were alleles, with 14 SNPs, of which two SNPs led to differences of the corresponding amino acids at sites 174 and 244. There were four genotypes of AhNAC4 in the 32 cultivars, containing 10 a1a1b1b1, 5 a1a1b2b2, 15 a2a2b1b1, and 2 a2a2b2b2. Meanwhile, 11 NAC4 genes ( Aw1NAC4- Aw11NAC4) were isolated from 19 wild peanut accessions in Arachis. Aw2NAC4 had the highest homology of nucleotide sequence with a1 or a2, and b1 or b2 had the highest homology of nucleotide sequence with Aw1NAC4. It is speculated that the protein encoding a1 plays a key role in responding drought stress, and the function of the proteins encoding a1 and b1 genes is closer with that of wild species.
图7 AtNAC3亚族氨基酸序列比对黑框代表AhNAC4蛋白的氨基酸差异位点。Fig. 7 Comparison of amino acid sequence of AtNAC3 subfamilyThe different sites of amino acid are shown by black frame.
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