不同产地半夏农艺性状及光合生理特性研究OA北大核心CSTPCD

To analyze the differences of agronomic characters and photosynthetic physiological characteristics of Pinellia ternata from different habitats in the same experimental field,the biennial Pinellia ternata germplasms from 20 producing areas were used as experimental materials.The agronomic traits,photosynthetic physiology and chlorophyll fluorescence were measured.The results showed that there were significant differences in the agronomic traits of Pinellia ternata germplasms from different producing areas,among them,Pinellia ternata from Shangluo of Shaanxi had the tallest plants and bulbs,Pinellia ternata from Guiyang,Guizhou had the largest leaf area,but Pinellia ternata from Baoding of Hebei had the lowest agronomic traits.The photosynthetic parameters of Pinellia ternata germplasms from different producing areas were significantly differences,and it was speculated that their photosynthetic characteristics and light energy utilization rate were quite different.Pinellia ternata germplasms from Sichuan and Guizhou were provenances with higher photosynthetic growth potential.Correlation analysis showed that net photosynthetic rate(Pn)was very significantly positively(P<0.01)correlated with stomatal conductance(Gs),water use rate(WUE),maximal fluorescence(Fm),electron transport rate(ETR)and chlorophyll a(Chl a),and was significantly positively(P<0.05)correlated with chlorophyll b(Chl b).Principal component analysis showed that seed ball diameter,mesoflobed leaf length,plant height,transpiration rate(Tr),photochemical quenching(qP)and intercellular CO2 concentration(Ci)were the main indexes affecting Pinellia ternata growth.Cluster analysis found that Pinellia ternata germplasms from Sichuan,Guizhou,Gansu,Henan,Hunan and Shaanxi with relatively high agronomic traits and strong photosynthetic potential were clustered into class I,and Pinellia ternata germplasms from Baoding,Xingtai,Zhangjiakou and Wenshan with lower agronomic traits and photosynthetic potential were clustered into class Ⅱ.In conclusion,Pinellia ternata germplasms from Sichuan,Guizhou,Gansu,Henan,Hunan and Shaanxi had obvious advantages and good cultivation prospects.Above results provided theoretical basis for breeding of Pinellia ternata.