논문 (학술지)
The pepper dehydration-responsive homeobox 1, CaDRHB1, plays a positive role in the dehydration response
| 등록번호 | RPMS-2018-0190693724 | SCI 구분
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※구분 : SCI(SCIE포함), 비SCI |
SCI |
|---|---|---|---|
| 저자명 (주·공동저자) | Lim Chae Woo; Hong Eunji; Bae Youngil; Lee Sung Chul | ||
| 논문구분 | 국외전문학술지 | 학술지명 | ENVIRONMENTAL AND EXPERIMENTAL BOTANY |
| ISSN | 0098-8472 | 학술지 출판일자 | 2018-03-01 |
| 학술지 볼륨번호 | 147 | 논문페이지 | 104 ~ 115 |
| 학술지 임팩트팩터 | 4.369 | 기여율 | 100 % |
| 초록 | Abstract Homeobox (HB) genes encode transcription factors that play important regulatory roles in plant growth, development, and plant responses to abiotic stresses, including water deficit. In pepper plant, little is known about HB genes and their functions. Here, we identified 95 putative HB genes within the pepper genome that were classified into 14 classes using phylogenetic analysis. Of the genes responsive to abiotic stresses and ABA treatment, we selected HD ZIP I gene CA08g08650 as a dehydration-responsive homeobox 1 (DRHB1) gene. CaDRHB1 -silenced pepper plants exhibited a dehydration-sensitive phenotype, characterized by decreased stomatal closure and high levels of transpirational water loss. CaDRHB1 -overexpressing transgenic Arabidopsis plants showed a contrasting opposite phenotype to that of CaDRHB1 -silenced pepper plants. Outside of the HD-ZIP domain, CaDRHB1 has a serine-rich region (amino acids 8–32) and an AHA motif (amino acids 216–243) which negatively and positively regulate transactivation activity in yeast, respectively. In addition, amino acids 139–190 interact with pepper type 2C protein phosphatases which act as a negative regulator of ABA signaling. Taken together, our findings suggest that CaDRHB1 acts as a positive factor for dehydration tolerance via regulation of ABA-mediated stomatal closure. Moreover, conserved domains may be involved in regulating CaDRHB1 function. Highlights We found 95 homeobox-containing genes in pepper genome. HD-ZIPI gene CaDRHB1 shows the highest induction in response to dehydration. CaDRHB1 regulates dehydration tolerance via ABA-mediated stomatal movement. Serine-rich region and AHA motif in CaDRHB1 control its transcriptional activity. | ||
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