桃树不同方位叶片光合能力与果实质地关系的研究

Relationship between Leaf Photosynthetic Characteristics and Fruit Texture from Different Positions in Peach Tree

研究桃树主干形和开心形冠内不同方位叶片光合特性与果实质地的关系。以7a生‘大久保’为试材,以树干为中心,划分为不同的方位,在生长时期测量每个方位叶片净光合速率(Pn)和叶绿素质量分数,果实采摘时测量不同部位果实的质构参数。结果表明:主干形桃树不同方位叶片Pn、叶绿素质量分数和质地特性差异显著,而开心形差异不显著。2种树形都表现为东北上层Pn、叶绿素和果实胶着性、咀嚼性高于其他方位,以西北下层最低,开心形桃树果实质地参数较为一致,且各部位果实的咀嚼性较高,果实成熟度一致性好。由相关性分析可以得出,叶绿素a、Pn与果实质地参数的相关性显著,初步认为,二者可以作为桃树果实质地优劣的评价指标之一。

To study the relationship between the leaf photosynthetic characteristics in different positions and fruit texture in the central leader form （CLF） and the open central form （OCF） of peach tree,seven year old ‘ Okubo ’ were used as material in this study.Trunk of peach trees in different positions as the center,the leaf net photosynthetic rate and chlorophyll mass fraction in different growing stages and fruit texture parameters in the commercial maturity were measured.The results showed that net photosynthetic rate of different positions，chlorophyll mass fraction and texture property showed a significant difference in CLF,but without significant difference to OCF.Net photosynthetic rate in upper northeast of the tree，chlorophyll mass fraction，fruit gumminess and chewiness were higher than in the other directions.And the position of northwest was the lowest in CLF and OCF.Fruit texture was better in OCF,and the chewiness of fruit in each direction was higher than that without mature inconsistency problem.Correlation analysis showed a high correlation among chlorophyll a，net photosynthetic rate and fruit texture.These two parameters may be considered and could be used to evaluate peach fruit texture.