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Effects of cadmium on growth


Effects of cadmium on growth and photosynthetic activities in pakchoi and mustard.

موضوع: اثر کادمیوم بر روی رشد و فتوسنتز در فعالیت های چوی پاک و خردل

زبان: انگلیسی

فرمت فایل: pdf

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Xin CHEN1, *, J. WANG1, 2, Y. SHI1, M.Q. ZHAO1, 2, and G.Y. CHI1' 2
1Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, People's Republic of China
2Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China

(Received December 18, 2008; Accepted June 8, 2010)

ABSTRACT. In this study, we determined the effects of different concentrations of soil cadmium (0-24 mg-kg-1) on growth and photosynthetic activities in leaves of pakchoi and mustard using pot experiments un der greenhouse conditions. Both shoot and root weight decreased progressively with increasing Cd concentra tion for pakchoi and mustard. Negative linear relationships were observed between total Chlorophyll contents and Cd concentrations in soils in pakchoi (r2=-0.681, P<0.01) and mustard (r2=-0.463, P<0.05). In comparison to the controls (Cd=0 mg-kg-1), significant reductions of chlorophyll-a and chlorophyll-b were both observed at 24 mg Cd kg-1soil. The increase in cadmium concentration also caused a decline in the net rate of photo synthesis (Pn) and stomatal conductance (Gs). At lower concentrations of Cd (e.g. 6 mg-kg-1), a retarded de velopment was observed only in mustard. However, a significant decrease of Gs for both plants was observed at concentrations above 12 mg Cd kg-1 soil. From this study, we found the photosynthetic activity of pakchoi more sensitive to Cd stress than that of mustard.

Keywords: Cadmium; Growth; Photosynthetic activities; Pigments.

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نویسنده:داود نبی زاده

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