摘要
Abstract
[Objective]Photosynthesis is the primary pathway for organic matter accumulation in plants,directly influen-cing both growth and fruit set in fruit trees,and can serve as an indicator of potential yield.This study investigated the photo-synthetic characteristics of three grape cultivars('Cabernet Sauvignon','Merlot',and'Chardonnay')to provide a theoreti-cal basis for the introduction,selection,and cultivation of wine grape varieties in the Taigu region and other ecologically similar areas.[Methods]Using'Cabernet Sauvignon','Merlot',and'Chardonnay'as test materials,we compared the photosyn-thetic parameters among cultivars,shoot types(fruit-bearing vs.vegetative shoots),and leaf positions.[Results]In all three grape cultivars,net photosynthetic rates(Pn),transpiration rates(Tr),and stomatal conductances(Gs)were consistently higher on fruit-bearing shoots than on vegetative shoots.Across leaf positions,Pn,Tr,and Gs followed the same trend,with middle leaves exhibiting the highest values,followed by lower and upper leaves.In contrast,intercellular CO2 concentration(Ci)was lower in middle leaves than in both upper and lower leaves.The photosynthetic physiological parameters among the middle leaves on fruit-bearing shoots of three cultivars,'Chardonnay'showed the highest Pn with an intermediate Tr;'Caber-net Sauvignon'exhibited a moderate Pn and the lowest Tr;and'Merlot'had the lowest Pn but the highest Tr.[Conclusion]The middle leaves on fruit-bearing shoots of wine grapes are the core functional leaves for photosynthetic performance.In the Taigu region,'Chardonnay'(with the highest Pn)and'Cabernet Sauvignon'(with the lowest Tr)demonstrate physiological advantages and are therefore recommended as priority cultivars for introduction and cultivation.关键词
酿酒葡萄/净光合速率/气孔导度/蒸腾速率/胞间CO2浓度Key words
wine grape/net photosynthetic rate/stomatal conductance/transpiration rate/intercellular CO2 concentration分类
农业科技
