Abstract
Excessive amounts of heavy metals adversely affect plant growth and development. Whereas some regions naturally contain high levels of heavy metals, anthropogenic release of heavy metals into the environment continuously increases soil contamination. Preliminary studies have shown that Chenopodium botrys can grow in some heavy metal contaminated soils and is a high accumulator plant species for Cu and moderately accumulator plant species for Fe, Mn, and Zn, thus, was considered as an important species in this study. Based on that, in this species, we studied the individual effects of heavy metals on the formation, development, and structure of anther and pollen. To achieve this purpose, surrounding area of Hame-Kasi iron and copper mine (Hamedan, Iran) was chosen as a polluted area where the amount of some heavy metals was several times higher than the natural soils. Flowers and young pods were removed from non-polluted and polluted plants, fixed in FAA 70, and subjected to developmental studies. Analysis of anther development in plants from contaminated sites showed general similarities in the pattern of pollen formation with those from non-polluted ones, but also deviation from typical form of major stages of anther and pollen development was seen in plants from polluted ones. Stabilizing of tapetum layer, increasing in tapetum layer numbers, thickening callose wall in the microspore mother cell stage, changing the anther shape, and decreasing the size of anther were the effects of heavy metals. Reduction of pollen number was also seen in the plants collected from polluted area.
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Acknowledgement
The authors would like to express their appreciation to Bu-Ali Sina University and Islamic Azad University (Hamedan, Iran) for their facilities and kind support.
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Yousefi, N., Chehregani, A., Malayeri, B. et al. Investigating the Effect of Heavy Metals on Developmental Stages of Anther and Pollen in Chenopodium botrys L. (Chenopodiaceae). Biol Trace Elem Res 140, 368–376 (2011). https://doi.org/10.1007/s12011-010-8701-6
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DOI: https://doi.org/10.1007/s12011-010-8701-6