NDLI: Physiological and biochemical responses induced by lead stress in Spirodela polyrhiza

Content Provider	Springer Nature Link
Author	Qiao, Xuqiang Shi, Guoxin Jia, Rong Chen, Lin Tian, Xiuli Xu, Jun
Copyright Year	2012
Abstract	The effects of increasing lead concentration on the activities of superoxide dismutase (SOD), peroxides (POD) and catalase (CAT), levels of ascorbate (AsA), reduced glutathione (GSH), Pb accumulation and its influence on nutrient elements, polyamines (PAs) content, as well as activities of polyamine oxidase (PAO) and ornithine decarboxylase (ODC), were investigated in Spirodela polyrhiza. POD and CAT activities increased progressively followed by a decline, while SOD activity gradually fell. The effect of Pb application on AsA content was similar to that seen for POD and CAT activities. GSH content initially rose but then declined. A significant enhancement in Pb accumulation was observed, except in the 25 μM Pb treatments. Nutrient elements were also affected. Moreover, Pb stress induced a considerable decrease in total spermidine (Spd), while the levels of total putrescine (Put) and spermine (Spm) initially increased at 25 μM Pb but then declined. Free and perchloric acid soluble conjugated (PS-conjugated) PAs contents changed in a similar way to total PAs. In addition, Pb stress induced a continuous accumulation of perchloric acid insoluble bound (PIS-bound) Spm and an initial accumulation of PIS-bound Put and Spd. The ratio of free (Spd + Spm)/Put significantly declined whereas the ratio of total (Spd + Spm)/Put rose at low Pb concentrations (25 and 50 μM). PAO activity rose gradually with an increase in Pb concentration, reaching peak values at 100 μM, while ODC activity first increased at 25 μM Pb and then declined. The results indicated that the tolerance of S. polyrhiza to Pb stress was enhanced by activating the antioxidant system, preventing the entry of the Pb ion and altering the content of polyamines.
Starting Page	217
Ending Page	225
Page Count	9
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	67
Issue Number	3
e-ISSN	15735087
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-04-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lemna minor Lead Polyamines Antioxidant system Nutrient elements Agriculture Plant Physiology Plant Anatomy/Development Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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