钙营养对甜菜幼苗生长和表观光合作用的影响  

Effects of calcium nutrition on growth and apparent photosynthesis of sugar beet seedlings

作　　者：何敏敏 王堽 耿贵 HE Minmin;WANG Gang;GENG Gui(College of Life Science,Heilongjiang University,Harbin 150080,China;College of Modern Agriculture and Ecological Environment,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学生命科学学院,哈尔滨150080 [2]黑龙江大学现代农业与生态环境学院,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2023年第3期325-331,F0003,共8页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金(31701487);国家糖料产业技术体系资助项目(CARS-170209)。

摘　　要：通过设置不同的Ca^(2+)浓度,探究钙营养对甜菜幼苗形态特性和光合作用的影响。结果表明,在0.50、0.75、1.50和3.50 mmol·L^(-1)Ca^(2+)浓度处理下,植株根面积、叶面积、株高和叶绿素含量均随Ca^(2+)浓度的升高而增加,在3.50 mmol·L^(-1)时达到最大值;随着Ca^(2+)浓度进一步提升至7.50 mmol·L^(-1)时,各项指标开始出现递减趋势;参数净光合速率、蒸腾速率、气孔导度和胞间CO_(2)浓度均随Ca^(2+)浓度的增加呈先上升后下降的趋势,在3.50 mmol·L^(-1)时达到最大值。相关性分析和主成分分析表明,4项表观光合作用指标间均存在显著相关性(P<0.005),株高、干重和Tr在衡量不同Ca^(2+)浓度对甜菜幼苗生长及光合作用影响中占主要成分。综上所述,适宜的钙营养能促进甜菜幼苗生长,提高光合生理代谢,且在Ca^(2+)浓度为3.50 mmol·L^(-1)时效果最佳。Different concentrations of Ca^(2+)were set to explore the effects of calcium nutrition on the morphological characte-ristics and photosynthesis of beet seedlings.The results showed that when the Ca^(2+)concentrations were 0.5,0.75,1.50 and 3.50 mmol·L^(-1),the root area,leaf area,plant height and chlorophyll content of the plants all increased with the Ca^(2+)concentration increasing,and reached the maximum value at 3.50 mmol·L^(-1).With the further increase of Ca^(2+)concentration to 7.5 mmol·L^(-1),the indexes began to show a decreasing trend.The net photosynthetic rate,transpiration rate,stomatal conductance and intercellular CO_(2) concentration showed a trend of first increasing and then decreasing with the increase of Ca^(2+)concentration,and reached the maximum value when the concentration of Ca^(2+)was 3.50 mmol·L^(-1).Correlation analysis and principal component analysis showed that there were significant correlations(P<0.005)among all the four apparent photosynthesis indexes.Plant height,dry weight and Tr were the main components in measuring the effects of different Ca^(2+)concentrations on the growth and photosynthesis of sugar beet seedlings.In conclusion,appropriate calcium nutrition could promote the growth of beet seedlings and improve photosynthetic physiological metabolism,and the effect was the best when the concentration of Ca^(2+)was 3.50 mmol·L^(-1).

关 键 词：Ca^(2+)浓度 甜菜幼苗 生长形态 光合作用 

分 类 号：S566.3[农业科学—作物学]