Stimulatory effect of lanthanum nitrate on the root tuber yield of Pseudostellaria heterophylla via improved photosynthetic characteristics  

作　　者：MA Yingli ZOU Huichao GU Hui SHI Dawei GAO Wenxiang ZHANG Yufeng XIE Yinfeng 马迎莉;邹慧超;谷慧;施大伟;高文翔;张雨峰;谢寅峰(Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the Environment Nanjing Forestry University)

机构地区：Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University Nanjing 210037, China

出　　处：《Journal of Rare Earths》2017年第6期610-620,共11页稀土学报（英文版）

基　　金：Project supported by Postgraduate Research&Practice Innovation Program of Jiangsu Provice,Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);the Doctorate Fellowship Foundation of Nanjing Forestry University,National Training Programs of Innovation and Entrepreneurship for Undergraduates(201410298001Z);Training Programs of Innovation and Entrepreneurship for Undergraduates of Nanjing Forestry University(2015sjcx190)

摘　　要：The stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristics, were investigated. Field experiments were conducted and the foliage was sprayed with varying concentrations of lanthanum nitrate. The results indicated that growth indexes, chlorophyll and carotenoid contents initially increased, and then decreased in a dose-dependent manner with increasing concentrations of lanthanum nitrate. The fresh and dry weights of root tuber yield per unit area significantly increased by 58.34% and 56.87% with a lanthanum nitrate concentration of 100 mg/L, respectively, compared with the control. Appropriate concentrations of lanthanum nitrate were found to alleviate photosynthetic depression at midday, as well as improve the mean values of photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（Tr） associated with the diurnal variation in photosynthetic parameters, while reducing intercellular CO2 concentration（Ci）. During the experiment, the chlorophyll fluorescence parameters Fv/Fm, Fv＇/Fm＇, ΦPSII and qP increased initially and then decreased along with the increasing concentration of lanthanum nitrate, while NPQ followed the opposite trend. Correlation analysis revealed that Pn had a significantly positive relationship with seedling height, ground diameter, chlorophyll and carotenoid contents, Gs and ΦPSII, while a negative relationship was observed with Ci and NPQ. Grey relational analysis（GRA） indicated that photosynthetic pigments, ΦPSII and qP were the primary factors impacting photosynthesis. These results suggested that the application of an appropriate concentration of lanthanum nitrate（100 mg/L） was effective in improving growth, root tuber yield and photosynthetic characteristics of Psendoste llaria（P） heterophylla. The regulatory effect of lanthanum nitrate on photosynthesis was related to the promotion of lThe stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristics, were investigated. Field experiments were conducted and the foliage was sprayed with varying concentrations of lanthanum nitrate. The results indicated that growth indexes, chlorophyll and carotenoid contents initially increased, and then decreased in a dose-dependent manner with increasing concentrations of lanthanum nitrate. The fresh and dry weights of root tuber yield per unit area significantly increased by 58.34% and 56.87% with a lanthanum nitrate concentration of 100 mg/L, respectively, compared with the control. Appropriate concentrations of lanthanum nitrate were found to alleviate photosynthetic depression at midday, as well as improve the mean values of photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（Tr） associated with the diurnal variation in photosynthetic parameters, while reducing intercellular CO2 concentration（Ci）. During the experiment, the chlorophyll fluorescence parameters Fv/Fm, Fv＇/Fm＇, ΦPSII and qP increased initially and then decreased along with the increasing concentration of lanthanum nitrate, while NPQ followed the opposite trend. Correlation analysis revealed that Pn had a significantly positive relationship with seedling height, ground diameter, chlorophyll and carotenoid contents, Gs and ΦPSII, while a negative relationship was observed with Ci and NPQ. Grey relational analysis（GRA） indicated that photosynthetic pigments, ΦPSII and qP were the primary factors impacting photosynthesis. These results suggested that the application of an appropriate concentration of lanthanum nitrate（100 mg/L） was effective in improving growth, root tuber yield and photosynthetic characteristics of Psendoste llaria（P） heterophylla. The regulatory effect of lanthanum nitrate on photosynthesis was related to the promotion of l

关 键 词：photosynthetic lanthanum nitrate chlorophyll tuber stomatal photosynthesis transpiration PSII seedling 

分 类 号：S567.53[农业科学—中草药栽培]