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Heme oxygenase-1 is involved in the cytokinin-induced alleviation of senescence in detached wheat leaves during dark incubation

Citation

Huang, J and Han, B and Xu, S and Zhou, M and Shen, W, Heme oxygenase-1 is involved in the cytokinin-induced alleviation of senescence in detached wheat leaves during dark incubation, Journal of Plant Physiology: Biochemistry, Physiology, Molecular Biology and Functional Biotechnology of Plants, 168, (8) pp. 768-775. ISSN 0176-1617 (2011) [Refereed Article]


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DOI: doi:10.1016/j.jplph.2010.10.010

Abstract

This study tested whether an inducible isoform of heme oxygenase (HO, EC 1.14.99.3), HO-1, is involved in the cytokinin (CTK)-induced alleviation of senescence in detached wheat (Triticum aestivum L.) leaves during dark incubation. We discovered that exogenous supplement of 6-benzylaminopurine (6-BA) at 10M for 48 h not only delayed the dark-induced loss of chlorophyll and protein contents in detached wheat leaves, but also significantly increased HO activity in a time-dependent manner. This induction reached a maximum within 3 h of 6-BA supply, which was further confirmed by using semi-quantitative RT-PCR and protein gel blot analysis. Furthermore, the decreases in intracellular thiobarbituric acid reactive substances (TBARS) content, and the increases in the transcript level, total and isozymatic activities of some important antioxidant enzymes, such as catalase (CAT, EC 1.11.1.6), peroxidase (POD, EC 1.11.1.7), superoxide dismutase (SOD, EC 1.15.1.1), and ascorbate peroxidase (APX, EC 1.11.1.11), were observed. Reversed responses of chlorophyll, protein and TBARS contents, HO activity, and the expression of above antioxidant enzymes were observed when zinc protoporphyrin-IX (ZnPPIX), a potent HO-1 inhibitor, was added together with 6-BA. In contrast, HO-1 inducer hemin could partially mimic the effects of 6-BA. Together, the results suggest that HO-1 might be involved in the CTK-induced alleviation of senescence and lipid peroxidation in detached wheat leaves.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Zhou, M (Professor Meixue Zhou)
ID Code:65919
Year Published:2011
Web of Science® Times Cited:14
Deposited By:Agricultural Science
Deposited On:2010-12-09
Last Modified:2012-05-23
Downloads:0

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