NDLI: Role of heme oxygenase-1 in spermidine-induced alleviation of salt toxicity during alfalfa seed germination

Content Provider	Springer Nature Link
Author	Zhu, Kaikai Zhang, Jing Cui, Weiti Jin, Qijiang Samma, Muhammad Kaleem Shen, Wenbiao
Copyright Year	2013
Abstract	This study investigated molecular mechanism of spermidine (Spd)-mediated enhancement of tolerance against salinity during alfalfa seed germination.A combination of histochemical, physiological and molecular approaches was used to study the effect of Spd on the alleviation of salt toxicity.Exogenously applied Spd (100 μM) and a heme oxygenase-1 (HO-1) inducer hemin (10 μM) not only up-regulated alfalfa HO-1 gene expression and increased its protein level and activity, but also significantly alleviated the inhibitory effects of 100 mM NaCl on seed germination and seedling growth. K$^{+}$ to Na$^{+}$ ratio was also increased. Further results revealed that total, isozymatic activities or corresponding transcripts of antioxidant enzymes, including superoxide dismutase (SOD), ascorbate peroxidase (APX) and guaiacol peroxidase (POD), were induced differentially. These antioxidant behaviors were confirmed by histochemical staining for the detection of lipid peroxidation and the loss of plasma membrane integrity. Above cytoprotective role of Spd is specific for HO-1 because the inhibitor of HO-1 significantly suppressed above responses, and some of the inhibitory effects were reversed when 10 % carbon monoxide (CO)-saturated aqueous solution was added.Together, our results suggested that Spd-mediated alleviation of NaCl toxicity during alfalfa seed germination acts, at least partially, in a HO-1-dependent pathway.
Starting Page	275
Ending Page	287
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	375
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2013-11-12
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heme oxygenase-1 Ion homeostasis Medicago sativa Oxidative damage Salinity Seed germination Spermidine Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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