沙棘果实生长期间维生素含量变化研究

STUDIES ON CHANGES IN VITAMIN CONTENTS OF SEABUCKTHON FRUIT DURING FRUIT GROWTH AND RIPENING PERIOD

本文对乌鞘岭地区天然分布的中国沙棘和西藏沙棘果实生长与成熟期间维生素C,PP,E等含量的动态变化进行了系统的调查和分析测定。结果表明:V_C主要存在于果肉中,且随果实发育而增加,果实变色期(花后107—110天)达到最高值,随后急速下降。但完熟后果肉中V_C减少时种子内V_C却有所增加。中国沙棘V_C水平远较西藏沙棘为高(5倍以上)。果实发育前期果肉中V_(PP)含量很高,以后逐渐下降,完熟期中国沙棘果实内V_(PP)再度升高,其变化与呼吸速率的变化表现出相同的消长规律。V_E主要存在于种子里,总趋势是随成熟而增加。种子变色期V_E上升至第一高峰值,随后下降,果实完熟后达到第二高峰值。西藏沙棘V_E含量高于中国沙棘。本文对不同维生素可能起的生理作用也进行了讨论。

The changes in contents of Vitamin C, Vpp, V_E in fruits of seabuckthon (Hippophae rhmnoides L. subsp, sinensis Rousi and H. thibetana Schlechted) which are naturally distributed in Wushaoling area have been investigated and analyzed systematically during fruit growing and ripening period. The main results are as follows. Ascorbic acid (V_C) mainly exists in fruit flesh, which increases with fruit development, and reaches maximum value at fruit color change phase (about 107—110 days after anthesis)and thn drops rapidly. While it in fruit flesh diminishes it contained in seeds increases. The Vitamin pp (V_(PP)) contact is very high in fruit flesh at the early stage of fruit development, and then gets lower gradually. It increases again during the ripening period. These show the same growth and decline pattern with the changes in respiratory rate. The Vitamin E (V_E) exists mainly in seeds, which has on upword tendeney with fruit growth. It reaches its first peak value at the phase of seed color change, then drops to its second peak value when fruits are ripe.The V_E. content in H. thibetana is higher than that in H. sinensis. The possible physiological functious of these vitamins are also discussed in this paper.