不同苗龄楸树叶片营养成分的季节性变化

以楸树优良无性系杂楸1号和杂楸3号的1年生、 2年生和3年生苗龄的幼苗作为供试对象,测定不同季节叶片含水率、维生素C、可溶性糖、可溶性蛋白、粗脂肪、粗纤维、粗灰分、氨基酸以及次生代谢物黄酮、蒽醌类化合物的含量,对不同苗龄楸树在不同季节叶片营养成分进行综合评价.结果表明:8月的2年生和3年生杂楸1号、 8月的3年生杂楸3号和10月的2年生杂楸3号具有高产量、高含糖量、富含维生素C等优点,综合评价最高,可进行饲用营养研究.建议采摘2年生和3年生苗龄的楸树叶片,采摘时间为8月前后.

Seasonal Variation in Leaf Nutrient Components of Catalpa bungei Plants of Different Ages

In order to understand the seasonal variation in feeding value of the leaves of manchurian catalpa (Catalpa bungei), leaf samples on the 1-, 2-and 3-year-old plants of the good clones No 1 and No 3 were taken at different seasons, and moisture content, vitamin C, soluble sugars, soluble protein, crude fat, crude fiber, crude ash, amino acids and secondary metabolites of flavonoids and anthraquinone compounds in them were analyzed. Their nutrient compositions were comprehensively studied with principal component analysis. The results showed that the 2-and 3-year-old catalpa clone 1 and clone 3 in August and 2-year-old clone 3 in October had the advantage of high yield and high sugar content, and were rich in minerals and in vitamin C. It is recommended that leaves of 2-and 3-year-old C. bungei trees be harvested around August.