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用椰糠与砖红壤土配成的6种不同基质栽培巴西香蕉组培苗,进行生长效果的比较;采用Li-6400便携式光合测定仪测定组培苗的净光合速率(pn)、蒸腾速率Tr等的日变化,通过相关性分析不同光合参数对净光合速率(pn)日变化的影响。结果表明:以椰糠∶壤土=1∶2配方对组培苗的生长效果最好;组培苗在不同基质下的净光合速率(pn)、蒸腾速率、气孔导度等变化趋势相似,其中以椰糠∶壤土=1∶2处理的数值最高,椰糠∶壤土=4∶1最低,胞间CO2浓度的数值则相反。6种基质栽培的香蕉组培苗以T2,即椰糠∶壤土=1∶2配制最适合香蕉组培苗生长。
Six different culture mediums of Brazilian banana were cocultivated with coco peat and brick red loam so as to compare their growth effects. The net photosynthetic rate (pn), transpiration rate Tr The diurnal variation of net photosynthetic rate (pn) under different photosynthetic parameters was analyzed by correlation. The results showed that the growth of tissue culture seedling was the best with the coconut bran: loam = 1: 2 formula. The net photosynthetic rate (pn), transpiration rate and stomatal conductance of tissue culture seedling under different substrates were similar The highest values were obtained with coco peat: loam = 1: 2, with coco peat: loam = 4: 1 the lowest, and the intercellular CO2 concentration was the opposite. The growth of banana tissue culture seedlings of six kinds of substrates was best suited for the preparation of banana plantlets with T2, namely coconut bran: loam = 1: 2.