The Influence of Altitude and Harvesting Period on the Quality of Gastrodia elata
To explore the effect of altitude and harvesting period on the quality of Gastrodia elata,the growing areas of G.elata were divided into 3 altitude levels(high:1 800-2 000 m,medium:1 500-1 700 m,low:1 200-1 300 m).The effects of altitude on the accumulation of gastrodin,p-hydroxybenzyl alcohol were studied.The results showed that the quality of G.elata harvested in January of the next year was better than that harvested in October of the same year,and the contents of gastrodin,free amino acids and extracts increased significantly with the increase of altitude.Correlation analysis of quality indexes showed that gastrodin content was positively correlated with free amino acid and extract content,and negatively correlated with total polyphenol content.The content of p-hydroxybenzyl alcohol was positively correlated with the content of total polyphenols,and negatively correlated with the content of extractives.There was a significant positive correlation between extract content and free amino acid content.The correlation analysis between altitude and quality index showed that altitude was positively correlated with gastrodin,free amino acids and extracts,and negatively correlated with p-hydroxybenzyl alcohol and total polyphenols.The principal component analysis showed that the selected quality index was scientific and reasonable,and the factor analysis method was suitable.The comprehensive evaluation score showed that high altitude＞medium altitude＞low altitude.In summary,the altitude and harvesting period had a certain impact on the quality of G.elata,and the quality of G.elataplanted at high altitude was the best,providing basic support for high-quality and efficient cultivation of G.elata.
万方数据
维普
