试管苗木薯的光合作用及水分关系特性

引进种试管苗木薯188比本地栽培种面包木薯具有相对高的光合速率、光合产物输出率、光合色素含量、叶片气孔传导性、良好的水分关系参数和较低的乙醇酸氢化酶活性。表明引进种试管苗比本地栽培种对干旱逆境的适应性强,生产性能高。

THE PROPERTIES OF PHOTOSYNTHESIS AND WATER RELATION OF CASSAVA (MANIHOT ESCULENTA) FROM TISSUE CULTURE SEEDLINGSTHE PROPERTIES OF PHOTOSYNTHESIS AND WATER RELATION OF CASSAVA (MANIHOT ESCULENTA) FROM TISSUE CULTURE SEEDLINGS

The higher photosynthesis rate,translocation rate of assimilate,content of photosynthetic pigments,leaf conductance and lower activity of glycolate oxidase were observed in leaves of cassava No.188 plants from tissue culture seedlings introduced from Columbia in comparation with local cultivar.The daily course and season changes of water potential were the same pattern in both cul-tivars,but plants of No.188 showed higher water potential in the morning and lower water potential at noon than that of local cultivar.The osmotic potential at zero turger was also lower in cultivar No.188 than that in local cultivar.These results are in agreement with the apparent higher yield and adaptation to water stress of cultivar No.188.It indicates that cultivar 188 will become valuable in the near future.The higher photosynthesis rate,translocation rate of assimilate,content of photosynthetic pigments,leaf conductance and lower activity of glycolate oxidase were observed in leaves of cassava No.188 plants from tissue culture seedlings introduced from Columbia in comparation with local cultivar.The daily course and season changes of water potential were the same pattern in both cul-tivars,but plants of No.188 showed higher water potential in the morning and lower water potential at noon than that of local cultivar.The osmotic potential at zero turger was also lower in cultivar No.188 than that in local cultivar.These results are in agreement with the apparent higher yield and adaptation to water stress of cultivar No.188.It indicates that cultivar 188 will become valuable in the near future.