Author:
Wang Z.,Yuan Z.,Quebedeaux B.
Abstract
The experiment was designed to determine how photoperiod duration affected the
partitioning of newly-fixed 14C and reserve carbon into
sorbitol, sucrose, and starch in apple source leaves, young sink leaves,
stems, and roots. Apple plants (Malus domestica Borkh.
cv. Gala), 1-year-old, were grown in environmental growth chambers and
received five different photoperiod treatments of 1, 4, 7, 10 and 14 h for 8
d. On the eighth day of the light treatments, plants were exposed to
14CO2 for 15 min and harvested at
0, 2, 6, 12 and 24 h after labelling for carbohydrate and
14C-carbohydrate analyses. Sorbitol and starch
concentrations in leaves, stems, and roots increased as photoperiod increased,
and peaked near 10-h photoperiod. Sucrose concentrations, however, either did
not change in mature leaves or decreased slightly in stems as photoperiod
increased from 1 to 14 h. At 24 h after 14
CO2 labelling, plants grown in longer photoperiods had
less [14C]sucrose,
[14C]sorbitol and
14C-total soluble fraction remaining in mature leaves,
but more 14C activities in stems and roots than those
grown in shorter photoperiods. We suggest that the increases in
14C-carbohydrates in stems and roots under longer
photoperiods are due to increased carbon export from mature source leaves.
Subject
Plant Science,Agronomy and Crop Science
Cited by
5 articles.
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