Photosynthesis of Autotetraploid Betula platyphylla Seedling Responding to NaHCO3 Stress
To evaluate the impact of intraspecies genome duplication on NaHCO3 stress, a series of Betula platyphylla autotetraploids and diploids were generated from the same family. The light response curve, CO2 response curve and chlorophyll fluorescence of these autotetraploid individuals were compared with those diploid trees. There were significant variations in light saturation point ( LSP ) , apparent quantum yield ( AQY ) , CO2 saturation point (CSP) and carboxylation efficiency (CE) between autotetraploids and diploids after NaHCO3 irrigated. The LSP,AQY,CSP and CE of autotetraploids were 19. 25%,26. 92%,13. 14% and 92. 09% greater than those of diploids,respectively. Chlorophyll fluorescence data revealed autotetraploids were significant higher in PSII maximal photochemical efficiency ( Fv/Fm ) , PSII actual photochemical efficiency (ФPSII ) and photochemical quenching (qP). After NaHCO3 irrigated,Fv/Fm,ФPSII and qP of autotetraploids were 7. 92%, 20. 05% and 24. 63% greater than those of diploids, respectively. These results demonstrate that the photosynthesis of B. platyphylla autotetraploids is more active than that of diploid individuals in NaHCO3 stress.
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