New Zealand Journal of Crop and Horticultural Science abstracts

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Changes in biotin levels in the leaves of two apple cultivars during the season

JOHN T. CHRISTELLER
MARGARET M. PHUNG

Insect Science Group
The Horticulture and Food Research
  Institute of New Zealand Ltd
Private Bag 11 030
Palmerston North, New Zealand

Abstract  The total biotin level (free plus protein-bound biotin) was measured in apple (Malus domestica Borkh.) leaves of both an early maturing `Gala' and a late maturing variety `Braeburn'. The biotin concentration increased linearly in apple leaves over the duration of the season, with both the final concentration and the rate of increase significantly greater in `Braeburn'. The concentrations ranged from 200-300 ng biotin/g (fresh leaf) during the leaf expansion phase to 600-800 ng biotin/g (fresh leaf) at senescence 10 months later. The calculated seasonal rates were 1.22 and 2.75 ng biotin/g (fresh leaf) per day for `Gala' and `Braeburn' respectively.

Keywords  biotin; biosynthesis; apple; seasonal variation

H97-6

Received 5 March 1997; accepted 22 November 1997

Short communication

PDF file of entire paper: medium quality (391K); (scanned from paper original: notes about this process)

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