An alginate-derived oligosaccharide enhanced wheat tolerance to cadmium stress |
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Authors: | L J Ma X M Li N Bu N Li |
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Institution: | (1) College of Chemistry and Life Science, Shenyang Normal University, 253, huanghe Street, 110034 Shenyang, China |
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Abstract: | Hydroponic experiments were carried out to study the role of alginate-derived oligosaccharides (ADO) in enhancing wheat (Triticum aestivum L.) tolerance to cadmium stress. Data were collected on plant biomass, chlorophyll content, photosynthetic rate, antioxidant
enzyme activity and malondialdehyde (MDA) content. Under 100 μM Cd stress, plant growth was significantly inhibited. Shoot
length, root length, fresh and dry weight were sharply reduced by 24.21, 34.59, 22.1 and 14.7%, respectively of the control
after 10 day of Cd exposure. Superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities were increased and
MDA content increased. Wheat seeds were soaked for 5 h in 1,000 mg L−1 ADO solution before cadmium stress. ADO pretreatment alleviated cadmium toxicity symptoms, which were reflected by increasing
root and shoot lengths, fresh and dry weight, chlorophyll content and photosynthetic rate (P
n
). Furthermore, ADO pretreatment significantly increased antioxidant enzyme (SOD, CAT and POD) activities and reduced MDA
content in leaves and roots. The results indicated that ADO pretreatment partially protected the seedlings from cadmium toxicity
during the following growth period. |
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Keywords: | |
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