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Genome-Wide Analysis of the Five Phosphate Transporter Families in <i>Camelina sativa</i> and Their Expressions in Response to Low-P
oleh: Dhondup Lhamo, Qiaolin Shao, Renjie Tang, Sheng Luan
Format: | Article |
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Diterbitkan: | MDPI AG 2020-11-01 |
Deskripsi
Phosphate transporters (PHTs) play pivotal roles in phosphate (Pi) acquisition from the soil and distribution throughout a plant. However, there is no comprehensive genomic analysis of the PHT families in <i>Camelina sativa</i>, an emerging oilseed crop. In this study, we identified 73 CsPHT members belonging to the five major PHT families. A whole-genome triplication event was the major driving force for CsPHT expansion, with three homoeologs for each <i>Arabidopsis</i> ortholog. In addition, tandem gene duplications on chromosome 11, 18 and 20 further enlarged the CsPHT1 family beyond the ploidy norm. Phylogenetic analysis showed clustering of the CsPHT1 and CsPHT4 family members into four distinct groups, while CsPHT3s and CsPHT5s were clustered into two distinct groups. Promoter analysis revealed widespread <i>cis</i>-elements for low-P response (P1BS) specifically in <i>CsPHT1s</i>, consistent with their function in Pi acquisition and translocation. In silico RNA-seq analysis revealed more ubiquitous expression of several <i>CsPHT1</i> genes in various tissues, whereas <i>CsPHT2s</i> and <i>CsPHT4s</i> displayed preferential expression in leaves. While several <i>CsPHT3s</i> were expressed in germinating seeds, most <i>CsPHT5s</i> were expressed in floral and seed organs. Suneson, a popular <i>Camelina</i> variety, displayed better tolerance to low-P than another variety, CS-CROO, which could be attributed to the higher expression of several <i>CsPHT1/3/4/5</i> family genes in shoots and roots. This study represents the first effort in characterizing CsPHT transporters in <i>Camelina</i>, a promising polyploid oilseed crop that is highly tolerant to abiotic stress and low-nutrient status, and may populate marginal soils for biofuel production.