Constitutive expression of a group 3 LEA protein from Medicago falcata (MfLEA3) increases cold and drought tolerance in transgenic tobacco.

Shi, Haifan; He, Xueying; Zhao, Yujuan; Lu, Shaoyun; Guo, Zhenfei

Shi, Haifan; He, Xueying; Zhao, Yujuan; Lu, Shaoyun; Guo, Zhenfei.

Afiliación

Shi H; College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China.
He X; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Engineering Research Center for Grassland Science, College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China.
Zhao Y; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Engineering Research Center for Grassland Science, College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China.
Lu S; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Engineering Research Center for Grassland Science, College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China.
Guo Z; College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China. zfguo@njau.edu.cn.

Plant Cell Rep ; 39(7): 851-860, 2020 Jul.

Article en En | MEDLINE | ID: mdl-32240329

RESUMEN

KEY MESSAGE: MfLEA3 is involved in protection of catalase activity and confers multiple abiotic stress tolerance. Late embryogenesis abundant (LEA) proteins are involved in plant growth, development and abiotic stress tolerance. A member of group 3 LEA proteins from Medicago sativa subsp. falcata (L.) Arcang, MfLEA3, was investigated in the study. MfLEA3 transcript was induced in response to cold, dehydration, and abscisic acid (ABA), while the cold-induced transcript of MfLEA3 was blocked by pretreatment with inhibitor of ABA synthesis. Constitutive expression of MfLEA3 led to enhanced tolerance to cold, drought, and high-light stress in transgenic tobacco plants. Compared to accumulated reactive oxygen species (ROS) in the wild-type in response to treatments with low temperature, drought, and high light, ROS were not accumulated in transgenic plants. Superoxide dismutase, catalase (CAT), and ascorbate-peroxidase activities were increased in all plants after treatments with the above stresses, while higher CAT activity was maintained in transgenic plants compared with wild-type. However, transcript level of CAT-encoding genes including CAT1, CAT2, and CAT3 showed no significant difference between transgenic plants and wild-type, indicating that the higher CAT activity was not associated with its gene expression. ABA sensitivity and transcripts of several ABA and stress-responsive genes showed no difference between transgenic plant and wild-type, indicating that ABA signaling was not affected by constitutive expression of MfLEA3. The results suggest that MfLEA3 may be involved in the protection of CAT activity and confers multiple abiotic stress tolerance.

Asunto(s)

Adaptación Fisiológica; Frío; Sequías; Regulación de la Expresión Génica de las Plantas; Medicago/genética; Nicotiana/genética; Nicotiana/fisiología; Proteínas de Plantas/genética; Ácido Abscísico/farmacología; Adaptación Fisiológica/efectos de los fármacos; Adaptación Fisiológica/efectos de la radiación; Secuencia de Aminoácidos; Catalasa/genética; Catalasa/metabolismo; Clonación Molecular; Deshidratación; Regulación de la Expresión Génica de las Plantas/efectos de los fármacos; Regulación de la Expresión Génica de las Plantas/efectos de la radiación; Peróxido de Hidrógeno/metabolismo; Luz; Estrés Oxidativo/efectos de los fármacos; Estrés Oxidativo/efectos de la radiación; Proteínas de Plantas/química; Proteínas de Plantas/metabolismo; Plantas Modificadas Genéticamente; ARN Mensajero/genética; ARN Mensajero/metabolismo; Nicotiana/efectos de los fármacos; Nicotiana/efectos de la radiación

Palabras clave

Abiotic stress; Antioxidant enzymes; LEA proteins; Medicago falcata; Reactive oxygen species

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Proteínas de Plantas / Nicotiana / Adaptación Fisiológica / Frío / Regulación de la Expresión Génica de las Plantas / Medicago / Sequías Idioma: En Revista: Plant Cell Rep Asunto de la revista: BOTANICA Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania

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