논문 (학술지)
Newly Identified Wild Rice Accessions Conferring High Salt Tolerance Might Use a Tissue Tolerance Mechanism in Leaf
| 등록번호 | RPMS-2018-0190690603 | SCI 구분
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※구분 : SCI(SCIE포함), 비SCI |
SCI |
|---|---|---|---|
| 저자명 (주·공동저자) | Prusty Manas R.; Kim Sung-Ryul; Vinarao Ricky; Entila Frederickson; Egdane James; Diaz Maria G. Q.; Jena Kshirod K. | ||
| 논문구분 | 국외전문학술지 | 학술지명 | FRONTIERS IN PLANT SCIENCE |
| ISSN | 1664-462X | 학술지 출판일자 | 2018-04-23 |
| 학술지 볼륨번호 | 9 | 논문페이지 | 417 ~ - |
| 학술지 임팩트팩터 | 4.291 | 기여율 | 100 % |
| DOI | 10.3389/fpls.2018.00417 | ||
| 초록 | Cultivated rice (Oryza sativa L.) is very sensitive to salt stress. So far a few rice landraces have been identified as a source of salt tolerance and utilized in rice improvement. These tolerant lines primarily use NaC exclusion mechanism in root which removes NaC from the xylem stream by membrane NaC and KC transporters, and resulted in low NaC accumulation in shoot. Identification of a new donor source conferring high salt tolerance is imperative. Wild relatives of rice having wide genetic diversity are regarded as a potential source for crop improvement. However, they have been less exploited against salt stress. Here, we simultaneously evaluated all 22 wild Oryza species along with the cultivated tolerant lines including Pokkali, Nona Bokra, and FL478, and sensitive check varieties under high salinity (240 mM NaCl). Based on the visual salt injury score, three species (O. alta, O. latifolia, and O. coarctata) and four species (O. rhizomatis, O. eichingeri, O. minuta, and O. grandiglumis) showed higher and similar level of tolerance compared to the tolerant checks, respectively. All three CCDD genome species exhibited salt tolerance, suggesting that the CCDD genome might possess the common genetic factors for salt tolerance. Physiological and biochemical experiments were conducted using the newly isolated tolerant species together with checks under 180 mM NaCl. Interestingly, all wild species showed high NaC concentration in shoot and low concentration in root unlike the tolerant checks. In addition, the wild-tolerant accessions showed a tendency of a high tissue tolerance in leaf, low malondialdehyde level in shoot, and high retention of chlorophyll in the young leaves. These results suggest that the wild species employ tissue tolerance mechanism to manage salt stress. Gene expression analyses of the key salt tolerancerelated genes suggested that high NaC in leaf of wild species might be affected by OsHKT1;4-mediated NaC exclusion in leaf and the following NaC sequestration in leaf might be occurring independent of tonoplast-localized OsNHX1. The newly isolated wild rice accessions will be valuable materials for both rice improvement to salinity stress and the study of salt tolerance mechanism in plants. | ||
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