Changes in the limonoate A-ring lactone and limonin 17-beta-D-glucopyranoside content of navel oranges during fruit growth and maturation
1991
Hasegawa, S. | Ou, P. | Fong, C.H. | Herman, Z. | Coggins, C.W. Jr | Atkin, D.R.
The amounts of limonoate A-ring lactone (LARL) and limonin 17-beta-D-glucopyranoside (LG) in navel oranges were measured during fruit growth and maturation. The LARL content (grams/fruit) increased sharply from June to August, reached a maximal level at the end of August, and then decreased gradually thereafter. LG began to appear in the flesh portion in September and in the peel 1 month later. Its content increased sharply from September to November and then slowly thereafter. The decrease in LARL and the increase in LG content occurred simultaneously at late stages of fruit growth and maturation, suggesting that LG is a metabolite of LARL. The amounts of total limonin (LARL + LG) continued to increase until the end of November and then remained fairly constant thereafter. This showed that the biosynthesis of LARL and its further conversion to LG appeared to continue in the fruit until the end of November.
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