Effect of arsenic on photosynthesis, growth and yield of five widely cultivated rice ( Oryza sativa L.) varieties in Bangladesh

A glass house experiment was conducted to investigate the effect of soil arsenic on photosynthetic pigments, chlorophyll-a and -b, and their correlations with rice yield and growth. The experiment was designed with three replications of six arsenic treatments viz. control, 10, 20, 30, 60, 90 mg of A...

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Bibliographic Details
Published in:	Chemosphere (Oxford) 2007-04, Vol.67 (6), p.1072-1079
Main Authors:	Azizur Rahman, M., Hasegawa, H., Mahfuzur Rahman, M., Nazrul Islam, M., Majid Miah, M.A., Tasmen, A.
Format:	Article
Language:	eng
Subjects:	Animal, plant and microbial ecology Applied ecology Arsenic Arsenic - toxicity Bangladesh Biological and medical sciences chemical concentration chemical constituents of plants Chlorophyll Chlorophyll - analysis Crops, Agricultural Ecotoxicology, biological effects of pollution Effects of pollution and side effects of pesticides on plants and fungi Fundamental and applied biological sciences. Psychology grain yield Growth leaves Oryza - drug effects Oryza - growth & development Oryza - metabolism Oryza sativa Photosynthesis Photosynthesis - drug effects phytotoxicity plant growth Plant Leaves - chemistry Rice Soil Pollutants - adverse effects soil pollution varieties Water Pollutants, Chemical - adverse effects Yield
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Summary:	A glass house experiment was conducted to investigate the effect of soil arsenic on photosynthetic pigments, chlorophyll-a and -b, and their correlations with rice yield and growth. The experiment was designed with three replications of six arsenic treatments viz. control, 10, 20, 30, 60, 90 mg of As kg −1 soil. Arsenic concentration in initial soil, to which the above mentioned concentrations of arsenic were added, was 6.44 ± 0.24 mg kg −1. Both chlorophyll-a and -b contents in rice leaf decreased significantly ( p < 0.05) with the increase of soil arsenic concentrations. No rice plant survived up to maturity stage in soil treated with 60 and 90 mg of As kg −1. The highest chlorophyll-a and -b contents were observed in control treatment (2.62 ± 0.24 and 2.07 ± 0.14 mg g −1 were the average values of chlorophyll-a and -b, respectively of the five rice varieties) while 1.50 ± 0.20 and 1.04 ± 0.08 mg g −1 (average of five rice varieties) of chlorophyll-a and -b, respectively were the lowest. The content of photosynthetic pigments in these five rice varieties did not differ significantly ( p > 0.05) from each other in control treatment though they differed significantly ( p < 0.05) from each other in 30 mg of As kg −1 soil treatment. Among the five rice varieties, chlorophyll content in BRRI dhan 35 was found to be mostly affected with the increase of soil arsenic concentration while BRRI hybrid dhan 1 was least affected. Well correlations were observed between chlorophyll content and rice growth and yield suggesting that arsenic toxicity affects the photosynthesis which ultimately results in the reduction of rice growth and yield.
ISSN:	0045-6535 1879-1298