文献类型： 外文期刊

作者： Su, W. C. ¹ ; Sun, L. L. ¹ ; Wu, R. H. ¹ ; Ma, Y. H. ¹ ; Wang, H. L. ¹ ; Xu, H. L. ¹ ; Yan, Z. L. ² ; Lu, C. T. ¹ ;

作者机构： 1.Minist Agr, Inst Plant Protect, Henan Acad Agr Sci, Henan Key Lab Crop Pest Control,IPM Key Lab South, Zhengzhou 45002, Peoples R China

2.Henan Acad Agr Sci, Inst Agr Econ & Informat, Zhengzhou, Henan, P

关键词： chlorophyll fluorescence;gas exchange;growth characteristics;photosystem II

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

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收录情况： SCI

摘要： The influence of various concentrations of imazapic residues (0-800 mu g kg(-1)) on the growth, chlorophyll content, and photosynthetic characteristics of maize seedlings was studied in a greenhouse pot experiment. Plant height, root length, shoot dry mass, root dry mass, and total dry mass of maize declined with the increase of imazapic residue concentrations. The root/shoot ratio initially decreased and then increased in presence of imazapic, which indicated that the effects of imazapic residues on plant height and root length might differ in maize seedlings. Lowered chlorophyll content and net photosynthetic rate were observed in leaves of maize seedlings in all treatments and indicated a dose-response relationship to imazapic concentrations. Intercellular carbon dioxide concentration, transpiration rate, and stomatal conductance also declined to varying extents, but the chlorophyll a/b ratio increased gradually together with the increase of imazapic residue concentrations. Generally, the maize seedlings were negatively affected by the imazapic residues in soil. Response of root length and biomass to imazapic residues could be the important index for maize variety selection.