A comparative study on photosynthetic characteristics of different types of bamboos
Photosynthesis is the basis of plant growth and biomass accumulation. Photosynthetic characteristics is regarded as an important physiological index for high light efficiency in bamboo species breeding. The photosynthetic performance of different bamboo species and their capacities to synthesize organic assimilate are key issues to be understood in order to explore and utilize the rich bamboo resources in China. This research aims at providing theoretical basis for different types of bamboo species selection and management through measuring and analyzing the photosynthetic parameters and light response curve of six bamboo species with different rhizome types, and further exploring the physiological basis of these differences with Li-6400. The results showed that different bamboo species’ net photosynthetic rates (Pn) differed significantly. Bambusa wenchouensis has the highest Pn with an average value reaching 8.379μmol?m-2?s-1 . Phyllostachys heterocycla cv. pubescens and P. praecox cv.prevernalis took the second place. Arundinaria oleosa and Pleioblastus amarus came the last. In general, it showed a trend of sympodial bamboo>monopodial bamboo> amphipodial bamboos. And Pn of 1-2 year old bamboos is higher than 3-4 year old bamboos, but the difference is not significant. An integrated analysis on stomata conductance (Cond), intercellular C02 concentration (Ci) and transpiration rate (Tr) verified that sympodial bamboo has the strongest photosynthetic carbon sequestration capacity. Being the two dominant factors, Transpiration rate and stomata conductance are most correlated with net photosynthetic rate. Light response curve showed that Pn differences among bamboo species were not significant at the beginning stage, but they raced up with light intensity increase, among which, Dendrocalamus.oldhami bears the highest potential photosynthetic capacity and is far higher than other bamboo species. In general, It also showed a trend of sympodial bamboo> monopodial bamboo > amphipodial bamboo, which further verified that sympodial bamboo bears a stronger photosynthetic carbon sequestration capacity. The findings provided a theoretical basis of screening, breeding and utilizing for different bamboo species, particularly for excellent sympodial bamboo species in the future.
国家科技期刊平台
NSTL
万方数据
维普
