Correlativity between photosynthetic physiological characteristics and biological yield of sweet sorghum strain
[Objective] Contrastive analysis of the differences between photosynthetic physiological indexes of different sweet sorghum strains at filling stage,and their correlations between biological yield,brix and physiology index were conducted. [Method] Nine sweet sorghum strains were chosen as the experiment material. Photosynthetic parameters such as net photosynthetic rate (Pn) , transpiration rate (Tr), cond(Gs), intercellular CO2 concentration(Ci) , were recorded, physiological indexes such as chlorophyll content(Chl) ,PEPCase activity(PEP) were determined, and agronomic traits such as plant weight, stembrix,yield,leaf area index (LAI) and their relationship were measured. [Result] There were differences in Pn, transpiration rate (Tr) ,cond (Gs) intercellular CO2 concentration (CO ,Chlorophyll A (Chla) Chlorophyll B (Chlb),Chi, nitrogen content (LNCa), total protein content (TP), soluble sugar (SS),PEP,LAI of nine sweet sorghum strains. The strains with higher Pn were "LT05","LT02","Xingaoliang No. 3","BA-BUSH","UT84",and "MN-94", with corresponding values of 16. 01,14. 60,14.57,14. 24,12. 83, and 12.56 Mmol/(m2 o s). The strains with higher Chi were "Xingaoliang No. 3", "LT02", "MN-94", and "LT05" with corresponding values of 4. 63,4. 36,3. 98,and 3. 91 mg/g. The strains with higher PEP were "LT05","UT84","LT02",and "Xingaoliang No. 3" with corresponding values of 23. 06 ,21. 78,18. 50,and 17.75 U/min. The strains with higher LAI were "BABUSH", "LT05", "LT02", "UT84", and "MN-94" with corresponding values of 3. 46,3. 30,2. 93,2. 41 ,and 2. 41. The strains with higher biological yield were "LT05VLT02","Xingaoliang No. 3",and "MN-94" with corresponding values of 46 669. 5,45 835. 5, 45 336. l,and 44 169. 2 kg/hm2. The strains with higher stem brix were "Xingaoliang No. 3","LT05", "UT84",and "BABUSH" with corresponding values of 19. 6°, 17. 6°, 16. 5°,and 16. 3°. Correlation analysis indicated that biological yield was highly significant correlated with Pn (R = 0. 933) ,and significant correlated with PEP and LAI (R = 0. 775 and 0. 743),and was highly correlated with Chl a,Chl b,Chl,G.v. Brix was significant correlated with Pn,Tr,PEP and LAI (R = 0. 685,0. 679,0. 747,and 0. 691). [Conclusion] "LT05VLT02","Xingaoliang No. 3",and "MN-94" had high biological yield,high brix and high photo-synthetic efficiency. The net photosynthetic rate could be effectively used as a selection index for breeding of high photosynthetic efficiency sweet sorghum.
NETL
NSTL
万方数据
维普
