高低淀粉木薯品种光合特性研究

为了探讨高低淀粉木薯品种不同生育期内光合特性的变化，以SC124和‘辐选01’两个块根淀粉含量不同的木薯品种为材料，利用LI-6400光合作用测定仪，研究高、低淀粉木薯品种的光合特性。结果表明：在整个生育期，高低淀粉木薯品种净光合速率呈先上升后下降的趋势，在木薯的苗期，‘辐选01’的净光合速率明显低于SC124；在块根膨大期，‘辐选01’的净光合速率明显高于SC124；在块根形成期、块根成熟期，差异不明显。在整个生育期，高低淀粉木薯品种蒸腾速率呈先上升后下降的趋势，在木薯的苗期、块根形成期、块根成熟期，‘辐选01’的蒸腾速率明显低于SC124；而在块根膨大期，‘辐选01’的蒸腾速率高于SC124，但差异不明显。在整个生育期，高低淀粉木薯品种气孔导度呈先上升后下降的趋势，在木薯的整个生长时期，‘辐选01’的气孔导度都低于SC124。在整个生育期，高低淀粉木薯品种胞间CO2浓度呈先上升后下降的趋势，在木薯的苗期、块根形成期，‘辐选01’的胞间CO2浓度都低于SC124，但差异不明显；在块根膨大期，‘辐选01’的胞间CO2浓度明显高于SC124；在块根成熟期，‘辐选01’的胞间CO2浓度明显低于SC124。

Studies on Photosynthetic Characteristics of High and Low Starch Cassava Variety

The photosynthetic characteristics of high and low starch cassava variety were studied with LI-6400 portable photosynthesis-fluorescence measurement instrument in this experiment. The results showed that, in the whole growth period, the high and low cassava starch varieties net photosynthetic rate rise was first after a downward trend. In seedling stage of cassava, ‘Fuxuan01’ solar net photosynthetic rate was significantly lower than SC124. In the root of swollen, ‘Fuxuan01’ of solar net photosynthetic rate was significantly higher than SC124. In root formation, root at maturity, no obvious difference. In the whole growth period, the high and low cassava starch varieties transpiration rate rise was first after a downward trend. Cassava in seedling stage, the root formation, root at maturity, the transpiration rate of ‘Fuxuan01’ was obviously lower than SC124. And in the root of swollen, ‘Fuxuan01’ the transpiration rate was higher than SC124, but no obvious difference. In the whole growth period, the high and low cassava starch varieties stomatal conductance was first after the rise of the decline of the trend. In the whole growth period of cassava, ‘Fuxuan01’ solar stomatal conductance were lower than SC124. In the whole growth period, the high and low cassava starch varieties intercellular CO2 concentration was first falling trend after rising. In seedling stage, the formation of the root of cassava, ‘Fuxuan01’ solar intercellular CO2 concentration was lower than SC124, but no obvious difference. In the root of swollen, ‘Fuxuan01’ solar intercellular CO2 concentration was significantly higher than SC124. In root at maturity, ‘Fuxuan01’ solar intercellular CO2 concentration was significantly lower than SC124.