Cloning and overexpression of the ascorbate peroxidase gene from the yam (Dioscorea alata) enhances chilling and flood tolerance in transgenic Arabidopsis.

Autor: Chen Z; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., Lu HH; Institute of Plant Biology, National Taiwan University, Taipei, 11110, Taiwan., Hua S; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., Lin KH; Department of Horticulture and Biotechnology, Chinese Culture University, Taipei, 11114, Taiwan., Chen N; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., Zhang Y; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., You Z; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., Kuo YW; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China., Chen SP; Institute of Dryland Crops, Sanming Academy of Agricultural Sciences, Sanming, 365000, Fujian, China. tw00058329@gmail.com.
Jazyk: angličtina
Zdroj: Journal of plant research [J Plant Res] 2019 Nov; Vol. 132 (6), pp. 857-866. Date of Electronic Publication: 2019 Sep 06.
DOI: 10.1007/s10265-019-01136-4
Abstrakt: Minghuai 1 (MH1) is a yam (Dioscorea alata) cultivar with high tolerance to flooding but sensitivity to chilling. MH1 responded differently to chilling and flooding according to various physiological parameters and antioxidant enzymes. Flooding led to an increase in ascorbate peroxidase (APX) activity in both roots and leaves, while chilling did not affect APX activity. The full length DaAPX ORF sequence from MH1 (750 bp) was then cloned. Phylogenetic analysis showed that plant cytosolic APXs into four major clusters and DaAPX was closely related to Oncidium. The DaAPX gene driven by a 35S promoter was transferred into Arabidopsis. The gene expression and enzyme activity of APX in the DaAPX transgenic lines 1-3 were significantly higher than in wild type (WT) plants. Compared to WT plants, seedling growth characteristics were significantly better in all transgenic lines under chilling, flooding, and oxidative stresses, indicating that the overexpression of DaAPX in Arabidopsis enhanced tolerance to several abiotic stresses. MH1 plants supplied with H 2 O 2 presented an increase in the activity of APX leading to enhanced tolerance to chilling. Functional characterization of the APX gene should improve our understanding of the chilling- and flood-response mechanism in the yam.
Databáze: MEDLINE
Externí odkaz: