Key Laboratory of Sweet Potato Biology and Biotechnology, Ministry of Agriculture and Rural Affairs/Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis & Utilization and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Agronomy & Biotechnology, China Agricultural University, Beijing 100193, China.
Cereal Crops Research Institute, Henan Academy of Agricultural Sciences, Postgraduate T&R Base of Zhengzhou University, Zhengzhou 450000, China.
Int J Mol Sci. 2022 Jan 8;23(2):686. doi: 10.3390/ijms23020686.
WRKY transcription factors are one of the important families in plants, and have important roles in plant growth, abiotic stress responses, and defense regulation. In this study, we isolated a WRKY gene, , from the wild relative of sweet potato (H.B.K.) G. Don. This gene was highly expressed in leaf tissue and strongly induced by 20% PEG6000 and 100 μM abscisic acid (ABA). Subcellar localization analyses indicated that ItfWRKY70 was localized in the nucleus. Overexpression of significantly increased drought tolerance in transgenic sweet potato plants. The content of ABA and proline, and the activity of SOD and POD were significantly increased, whereas the content of malondialdehyde (MDA) and HO were decreased in transgenic plants under drought stress. Overexpression of up-regulated the genes involved in ABA biosynthesis, stress-response, ROS-scavenging system, and stomatal aperture in transgenic plants under drought stress. Taken together, these results demonstrated that plays a positive role in drought tolerance by accumulating the content of ABA, regulating stomatal aperture and activating the ROS scavenging system in sweet potato.
WRKY 转录因子是植物中重要的家族之一,在植物生长、非生物胁迫响应和防御调节中具有重要作用。本研究从甘薯野生近缘种(H.B.K.)G. Don 中分离得到一个 WRKY 基因 。该基因在叶片组织中高度表达,并强烈诱导 20%PEG6000 和 100μM 脱落酸(ABA)。亚细胞定位分析表明 ItfWRKY70 定位于细胞核。过表达 显著提高了转基因甘薯植株的耐旱性。在干旱胁迫下,转基因植株中 ABA 和脯氨酸的含量以及 SOD 和 POD 的活性显著增加,而 MDA 和 HO 的含量降低。在干旱胁迫下,过表达 上调了参与 ABA 生物合成、胁迫响应、ROS 清除系统和气孔开度的基因在转基因植株中的表达。综上所述,这些结果表明, 在甘薯中通过积累 ABA 的含量、调节气孔开度和激活 ROS 清除系统来积极参与耐旱性。