NDLI: Responses of growth and antioxidant system to root-zone hypoxia stress in two Malus species

Content Provider	Springer Nature Link
Author	Bai, Tuanhui Li, Cuiying Ma, Fengwang Feng, Fengjuan Shu, Huairui
Copyright Year	2009
Abstract	Responses of growth and antioxidant system to root-zone hypoxia stress were comparatively studied in two Malus species (M. hupenensis and M. toringoides) differing in hypoxia tolerance. 50-day-old seedlings were hydroponically grown for 20 days in normoxic and hypoxic nutrient solutions. Hypoxia stress inhibited the growth of both species. Compared with M. hupenensis, M. toringoides was more responsive to hypoxia stress, resulting in larger decreases in leaf number, root length, plant height, and biomass production. The contents of superoxide radicals $$ \left( {{\text{O}}_2 \bar{ \cdot }} \right) $$ and hydrogen peroxide (H$_{2}$O$_{2}$) significantly increased in roots of both species exposed to hypoxia stress, and resulted in lipid peroxidation, which was indicated by accumulated concentration of malonaldehyde (MDA). In addition, a significant increase in $$ {\text{O}}_2 \bar{ \cdot } $$ , H$_{2}$O$_{2}$ and MDA contents was found in M. toringoides under hypoxia stress. In responses to hypoxia stress, peroxidse (POD), superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) activities increased during the early part of the hypoxia stress, but decreased in the late period; the activities of SOD, POD and APX were more increased in M. hupenensis than in M. toringoides. Ascorbic acid (AsA) and glutathione (GSH) accumulation was also higher in M. hupenensis than in M. toringoides in the early period under hypoxia stress. These results suggest that the hypoxia-tolerant M. hupenensis has a larger protective capacity against oxidative damage by maintaining higher induced activities of antioxidant system than the hypoxia-sensitive M. toringoides.
Starting Page	95
Ending Page	105
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	327
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-06-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hypoxia stress Malus Oxidative stress Antioxidants Antioxidant enzymes Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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