Your browser doesn't support javascript.
loading
Heme is involved in the exogenous ALA-promoted growth and antioxidant defense system of cucumber seedlings under salt stress.
Wu, Yue; Li, Jing; Wang, Junwen; Dawuda, Mohammed Mujitaba; Liao, Weibiao; Meng, Xin; Yuan, Hong; Xie, Jianming; Tang, Zhongqi; Lyu, Jian; Yu, Jihua.
Afiliación
  • Wu Y; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Li J; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Wang J; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Dawuda MM; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Liao W; Department of Horticulture, University for Development Studies, Tamale, Ghana.
  • Meng X; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Yuan H; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Xie J; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Tang Z; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Lyu J; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
  • Yu J; College of Horticulture, Gansu Agricultural University, Lanzhou, 730070, China.
BMC Plant Biol ; 22(1): 329, 2022 Jul 08.
Article en En | MEDLINE | ID: mdl-35804328
A biosynthetic precursor of tetrapyrrol, 5-aminolevulinic acid (ALA), is widely used in agricultural production, as an exogenous regulatory substance that effectively regulates plant growth. Previous studies have shown that heme and chlorophyll accumulate in plants under salt stress, when treated with exogenous ALA. In this study, we explored the regulatory role of heme in plants, by spraying 25 mg L-1 ALA onto the leaves of cucumber seedlings treated with heme synthesis inhibitor (2,2'-dipyridyl, DPD) and heme scavenger (hemopexin, Hx), under 50 mmol L-1 NaCl stress. The results showed that NaCl alone and DPD + Hx treatments to cucumber seedlings subjected to salt stress adversely affected their growth, by decreasing biomass accumulation, root activity, and root morphology. In addition, these treatments induced an increase in membrane lipid oxidation, as well as enhancement of anti-oxidase activities, proline content, and glutamate betaine. However, exogenous ALA application increased the plant growth and root architecture indices under NaCl stress, owing to a lack of heme in the seedlings. In addition, cucumber seedlings treated with DPD and Hx showed inhibition of growth under salt stress, but exogenous ALA effectively improved cucumber seedling growth as well as the physiological characteristics; moreover, the regulation of ALA in plants was weakened when heme synthesis was inhibited. Heme biosynthesis and metabolism genes, HEMH and HO1, which are involved in the ALA metabolic pathway, were upregulated under salinity conditions, when ferrochelatase activity was inhibited. Application of exogenous ALA increased the heme content in the leaves. Thus, exogenous ALA may supplement the substrates for heme synthesis. These results indicated that heme plays a vital role in the response of plants to salinity stress. In conclusion, heme is involved in ALA-mediated alleviation of damage caused to cucumber seedlings and acts as a positive regulator of plant adaption.
Asunto(s)
Palabras clave

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cucumis sativus / Plantones Idioma: En Revista: BMC Plant Biol Asunto de la revista: BOTANICA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cucumis sativus / Plantones Idioma: En Revista: BMC Plant Biol Asunto de la revista: BOTANICA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido