Effects of selenium and sulfur on antioxidants and physiological parameters of garlic plants during senescence

Autor: Bo CHENG, Hai-feng LIAN, Ying-ying LIU, Xin-hui YU, Ya-li SUN, Xiu-dong SUN, Qing-hua SHI, Shi-qi LIU
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Journal of Integrative Agriculture, Vol 15, Iss 3, Pp 566-572 (2016)
Druh dokumentu: article
ISSN: 2095-3119
65805232
DOI: 10.1016/S2095-3119(15)61201-1
Popis: A hydroponic study was conducted to determine the effects of selenium (Se: 0, 3, 6 μmol L–1) on senescence-related oxidative stress in garlic plants grown under two sulfur (S) levels. We evaluated the yields of plants harvested at 160 and 200 days after sowing. Plants grown under a low Se dose (0.3 μmol L–1) at low S level showed higher yields (12.0% increase in fresh weight yield, 13.7% increase in dry weight yield) than the controls, despite a decrease in chlorophyll concentration. Compared with control plants, the Se-treated plants showed lower levels of lipid peroxidation. The Se-treated plants also showed higher activities of glutathione peroxidase and catalase, but lower superoxide dismutase activities. Changes in Fv/Fm values and proline contents were affected more strongly by S than by Se. On the basis of our results, we can conclude that Se plays a key role in the antioxidant systems in garlic seedlings. It delays senescence by alleviating the peroxide stress, but it can be toxic at high levels. A high S level may increase tolerance to high Se concentrations through reducing Se accumulation in plants.
Databáze: Directory of Open Access Journals
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