Effect of arsenic on photosynthesis, growth and yield of five widely cultivated rice (Oryza sativa L.) varieties in Bangladesh
Effect of arsenic on photosynthesis, growth and yield of five widely cultivated rice (Oryza sativa L.) varieties in Bangladesh
复制标题
DOI：
10.1016/j.chemosphere.2006.11.061
复制
发表时间：
2007-04-01
期刊：
影响因子：
8.8
通讯作者：
Tasmen, A.
中科院分区：
文献类型：
--
作者：
Rahman, M. Azizur;Hasegawa, H.;Tasmen, A.
采用温室试验研究了土壤砷对水稻光合色素叶绿素a和叶绿素B的影响及其与水稻产量和生长的关系。试验设对照、10、20、30、60、90 mg·kg ~（-1）土壤砷处理3个重复。初始土壤中的砷浓度为6.44 +/- 0.24 mg kg（-1）。水稻叶片叶绿素a和叶绿素B含量均随土壤砷浓度的增加而显著降低（p < 0.05）。在60和90 mg·kg ~（-1）处理的土壤中，水稻没有一株存活到成熟期。叶绿素a和叶绿素B含量以对照处理最高（2.62 +/- 0.24和2.07 +/- 0.14 mg g（-1）为叶绿素-a和-B的平均值，5个水稻品种的平均含量分别为1.50 +/- 0.20和1.04 +/- 0.08 mg g（-1）叶绿素a和叶绿素B含量（5个品种的平均值）最低。在土壤砷浓度为30 mg·kg ~（-1）时，各品种间光合色素含量差异显著（p <0.05），但在对照处理中，各品种间差异不显著（p> 0.05）。在5个水稻品种中，随着土壤砷浓度的增加，BRRI丹35的叶绿素含量受到的影响最大，而BRRI杂交丹1号的叶绿素含量受到的影响最小。叶绿素含量与水稻生长发育和产量呈良好的相关性，表明砷毒害影响了水稻的光合作用，最终导致水稻生长发育和产量下降。(c)2006爱思唯尔有限公司版权所有。
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. (c) 2006 Elsevier Ltd. All rights reserved.