NDLI: Cadmium Accumulation and Tolerance of Two Safflower Cultivars in Relation to Photosynthesis and Antioxidantive Enzymes

Content Provider	Springer Nature Link
Author	Shi, Gangrong Liu, Caifeng Cai, Qingsheng Liu, Qingqing Hou, Cuiping
Copyright Year	2010
Abstract	To investigate the effects of cadmium (Cd) on photosynthetic and antioxidant activities of safflower (Carthamus tinctorius L.) plants, two cultivars (Yuming and New safflower No. 4) were used for long-term pot experiment, under 0, 25, 50 or 100 mg Cd kg−1 (DW) soil conditions. The results showed that there is a large amount of Cd (148.6–277.2 mg kg−1) accumulated in the shoot of safflower, indicating this species might be a potential Cd accumulator. Exposure to 25–100 mg Cd kg−1 soil decreased the net photosynthetic rate by 25.6%–48.9% for New safflower No. 4, and 16.7%–57.3% for Yuming, respectively. The inhibition of photosynthesis might result from the limitation of stomatal conductance, reduction in photosynthetic pigment, and destruction of photosynthetic apparatus caused by Cd stress. Cd caused an enhancement of malondialdehyde (MDA), an increase in activity of superoxide dismutase (SOD) and ascorbate peroxidase (APX), and a decrease in catalase (CAT) activity for both cultivars. It seems that SOD and APX accounted for the scavenging of oxidant stress in safflower cultivars. The physiological response of safflower plants to Cd stress was cultivar- and dose- dependent. New safflower No. 4 exhibited high photosynthetic performance at high Cd stress, which may be contributed by high intercellular CO2 concentration, APX activity and Car/Chl ratio. In contrast, Yuming is more tolerant to Cd toxicity at low Cd level, in which an efficient antioxidant system is involved.
Starting Page	256
Ending Page	263
Page Count	8
File Format	PDF
ISSN	00074861
Journal	Bulletin of Environmental Contamination and Toxicology
Volume Number	85
Issue Number	3
e-ISSN	14320800
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-07-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antioxidant activity Cadmium Photosynthesis Safflower Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Environmental Chemistry Soil Science & Conservation Ecotoxicology Environmental Health Pollution
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Pollution Medicine Toxicology

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