Comparison of photosynthetic characteristics of newly introduced wine grape varieties at the eastern foothills of the Helan Mountains in Ningxia
[Objective]To study the photosynthetic physiological characteristics of the wine grape vari-eties Marselan,Malbec,Petit Manseng and Viognier planted in the eastern foothills of the Helan Mountain in Ningxia,and the wine grape varieties Cabernet Sauvignon(CK1)and Chardonnay(CK2),which are widely planted in the production area,and to screen new varieties suitable for planting in this area.[Method]The photoresponse curve,the CO2 response curve and the characteristics of the diurnal variation of photosynthe-sis of mature leaves of different cultivars were determined.[Result]Among the characteristic parameters of the photoresponse curve,the maximum net photosynthetic rate(Pm)and the light saturation point(LSP)of Marselan were significantly higher than those of other varieties,and the photocompensation point(CCP)and the dark respiration rate(Rd)of CK2 were the largest and the apparent quantum efficiency(AQY)was lower than those of other varieties.From the characteristic parameters of the CO2 response curve,it can be seen that the carboxylation efficiency(CE),maximum photosynthetic capacity(Amax)and photorespiration rate(Rq)of Viognier are significantly higher than other varieties,and the CO2 saturation point(CSP)of each variety varies between 1 109.98～1 318.83 μmol/(m2·s),CK2 has the highest CO2 compensation point(CCP)of 77.74 μmol/(m2·s),followed by Malbec,and Viognier is the lowest.It is 60.18 μmol/(m2·s).Among the daily variations of the photosynthetic varieties,the daily Pn of Marselan and Malbec showed a bi-modal curve and an obvious"photosynthetic lunch break"phenomenon,while the daily Pn of the other four varieties showed a unimodal curve,among which the net photosynthetic rate Viognier of had the highest daily mean and that of Malbec the lowest.[Conclusion]The photosynthetic adaptability of the four newly introduced varieties in the eastern foothills of the Helan Mountain was good,and the photosynthetic capacity was Viognier>Petit Manseng>CK2>Malbec>Marselan>CK1.
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