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| 著者 | Piao W., Suk-Hwan Kim, Byoung-Doo Lee, An G., Sakuraba Y., Nam-Chon Paek | |
| タイトル | Rice transcription factor OsMYB102 delays leaf senescence by down-regulating abscisic acid accumulation and signaling. | |
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Abstract: MYB-type transcription factors (TFs) play important roles in plant growth and development, and in the responses to several abiotic stresses. In rice (Oryza sativa), the roles of MYB-related TFs in leaf senescence are not well documented. Here, we examined rice MYB TF gene OsMYB102 and found that an OsMYB102 T-DNA activation-tagged line (termed OsMYB102-D), which constitutively expresses OsMYB102 under the control of four tandem repeats of the 35S promoter, and OsMYB102-overexpressing transgenic lines (35S:OsMYB102 and 35S:GFP-OsMYB102) maintain green leaves much longer than the wild-type under natural, dark-induced, and abscisic acid (ABA)-induced senescence conditions. Moreover, an OsMYB102 knockout mutant showed an accelerated senescence phenotype under dark-induced and ABA-induced leaf senescence conditions. Microarray analysis showed that a variety of senescence-associated genes (SAGs) were down-regulated in the OsMYB102-D line. Further studies demonstrated that overexpression of OsMYB102 controls the expression of SAGs, including genes associated with ABA degradation and ABA signaling (OsABF4, OsNAP, and OsCYP707A6), under dark-induced senescence conditions. OsMYB102 inhibits ABA accumulation by directly activating the transcription of OsCYP707A6, which encodes the ABA catabolic enzyme ABSCISIC ACID 8'-HYDROXYLASE. OsMYB102 also indirectly represses ABA-responsive genes, such as OsABF4 and OsNAP. Collectively, these results demonstrate that OsMYB102 plays a critical role in leaf senescence by down-regulating ABA accumulation and ABA signaling responses. |
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| 掲載誌 | J. Exp. Bot. | |
| Country | South Korea | |
| 刊数 | 70(10) | |
| ページ | 2699-2715 | |
| 発刊年 | 2019 | |
| PubMed ID | 30825376 | |
| PubMed Central ID | 6506775 | |
| DOI | 10.1093/jxb/erz095 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | ABA8OX2 BZIP72 MYB102 NAC58 NYC1 SGR | |
| INSD | - | |
| 系統 |
野生イネ コアコレクション |
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| 突然変異系統(遺伝研 Collection) | - | |
| 種子不稔系統 | - | |
| 致死変異体系統 | - | |
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組織別発生段階 - 突然変異系統(遺伝子) |
- | |
| 栽培イネ品種(遺伝研 Collection) | - | |
| 組織別発生段階 | - | |
