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对苹果幼树新梢生长期~(14)C同化物的种类和运转特性研究结果表明:(1)苹果叶片~(14)C同化物主要是糖,以山梨醇含量最高,蔗糖次之,葡萄糖和果糖很少;叶合成的氨基酸主要有天冬氨酸、丝氨酸、丙氨酸和天冬酰胺。(2)山梨醇输出叶片速度大于蔗糖,向所在新梢以上发育部位短途输送以山梨醇为主,向其它器官长距离供应,蔗糖占优势。(3)叶片同化物在一昼夜内即完成地上地下部循环。根系上运物质主要是氨基酸,以谷酰氨,天冬酰胺和天冬氨酸为主。它们在地上部各器官的分配受代谢强度调节,无严格对应关系。
The results showed that: (1) The (14) C assimilate of apple leaves was mainly sugars, with the highest content of sorbitol, followed by sucrose, Glucose and fructose seldom; leaf synthesis of amino acids are mainly aspartic acid, serine, alanine and asparagine. (2) The output of sorbitol was faster than that of sucrose, sorbitol was mainly delivered to the development sites above the shoots, and the long-distance supply to other organs was the most important. (3) leaf blade assimilate in a day and night to complete the ground above ground circulation. The root transport material is mainly amino acids to glutamine, asparagine and aspartic acid-based. Their distribution in the aboveground organs is regulated by the metabolic intensity and there is no strict corresponding relationship.