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Genome-wide analysis indicates diverse physiological roles of the turnip (Brassica rapa var. rapa) oligopeptide transporters gene family

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Plant Diversity 2018年第2期40卷 57-67页

作者： Yanan Pu Danni Yang Xin Yin Qiuli Wang Qian Chen Yunqiang Yang Yongping Yang Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Science Kunming 650204 China Plant Germplasm and Genomics Center Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China Institute of Tibetan Plateau Research at Kunming Kunming Institute of Botany Chinese Academy of Sdences Kunming 650201 China University of Chinese Academy of Sciences Beijing 100049 China Yunnan University Kunming 650091 China

Oligopeptide transporters(OPTs) encode integral membrane-localized proteins and have a broad range of substrate transport capabilities. Here, 28 BrrOPT genes were identified in the turnip. Phylogenetic analyses revealed two well-supported clades in the OPT family, containing 15 brropts and 13 *** exon/intron structure of OPT clade are conserved but the yellow stripe-like(YSL) clade was *** exon/intron of the YSL clade possesses structural differences, whereas the YSL class motifs structure are conserved. The OPT genes are distributed unevenly among the chromosomes of the turnip *** and chromosomal distribution analyses revealed that the expansion of the OPT gene family is mainly attributable to segmental duplication. For the expression profiles at different developmental stages, a comprehensive analysis provided insights into the possible functional divergence among members of the paralog OPT gene family. Different expression levels under a variety of ion deficiencies also indicated that the OPT family underwent functional divergence during long-term ***. BrrOPT8.1, BrrYSL1.2, BrrYSL1.3, BrrYSL6 and BrrYSL9 responded to Fe(Ⅱ) treatments and BrrYSL7 responded to calcium treatments, BrrYSL6 responded to multiple treatments in root, suggesting that turnip OPTs may be involved in mediating cross-talk among different ion deficiencies. Our data provide important information for further functional dissection of brropts, especially in transporting metal ions and nutrient deficiency stress adaptation.

关键词： brropts Segmental duplication Functional differentiation Turnip

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