New Zealand Journal of Botany abstracts
B00007Received 5 April 2000; accepted 19 October 2000
Short communication
New Zealand mistletoes have equal or lower capacities for electron
transport than their hosts
GRAHAM L. STRONG
PETER BANNISTER
DAVID J. BURRITT
Botany Department
University of Otago
P.O. Box 56
Dunedin, New Zealand
Abstract Previous work on the New Zealand mistletoes
Ileostylus micranthus and
Tupeia antarctica indicates that these
mistletoes have lower maximum electron transport rates (ETRmax) than their
hosts. We extend this research by testing seven of the eight extant endemic New
Zealand mistletoes using chlorophyll fluorescence measurements. In addition, we
examined whether loranthaceous (
Alepis flavida,
Ileostylus
micranthus,
Peraxilla colensoi,
P. tetrapetala,
Tupeia
antarctica) and viscaceous mistletoes (
Korthalsella lindsayi,
K.
salicornioides) differed in their capacities for electron transport.
Electron transport rates were significantly related to photosynthetically
active photon flux densities (PPFD). Overall, mistletoes had significantly
lower (110 ± 18 mol m
-2 s
-1) ETRmax than their
hosts (219 ± 43 mol m
-2 s
-1), but some specific
host-mistletoes pairs showed no significant difference in ETRmax. There was no
clear distinction in ETRmax between mistletoe families. We conclude that New
Zealand mistletoes generally have lower electron transport rates at the same
PPFD and, usually, lower photosynthetic capacities than their hosts.
Keywords Loranthaceae; Viscaceae; New Zealand; mistletoe;
chlorophyll florescence; electron transport rate; photon flux density; PAR; CO2
assimilation
New Zealand Journal of Botany, 2001, Vol. 39: 171-174
0028-825X/00/3901-0171 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (309K); (scanned from paper original: notes about this process)
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