Date: Fri, 04 Feb 2000 14:44:43 +0100 From: Fabien ZUNINO <zunino@campus.univ-poitiers.fr> To: cp@opus.hpl.hp.com Message-Id: <aabcdefg357$foo@default> Subject: I want to become a member
Hi all!
Two references about CP:
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Costs and benefits of carnivory in plants: Insights from the photosynthetic
performance of four carnivorous plants in a subarctic environment
Mendez M.; Karlsson P.S.
Oikos, Volume 86, Issue 1, 1999, Pages 105-112
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Abstract
We measured photosynthetic performance in four subarctic carnivorous
plants, Pinguicula alpina, P. villosa, P. vulgaris and Drosera
rotundifolia, in order to test if there is a cost of combining
photosynthetic and trapping devices into the same organ (leaves). We
compared these data with published results on photosynthetic rates in
subarctic non-carnivorous plants. In P. vulgaris, an experiment of prey
addition and removal further tested the existence of a short-term benefit
of increased nutrient gain from prey in terms of photosynthetic efficiency.
Leaf area-based photosynthetic rates (P(a)) ranged 2.0-3.0 mol CO2 m-2 s-1,
dry mass-based photosynthetic rates (P(w)) 42-69 nmol CO2 g-1 s-1 and
photosynthetic nitrogen use efficiency (PNUE) 29-45 mol CO2 mol N-1 s-1. In
general, P(a) and P(w) of carnivorous plants increased with leaf nitrogen
content. When each species was analysed separately, those relationships
were weak (P. alpina and P. villosa) or non-significant (P. vulgaris and D.
rotundifolia). The photosynthetic rate of carnivorous plants was lower than
that of other subarctic growth forms. In addition, P(w) for a given leaf
nitrogen content was significantly lower in carnivorous plants than in
non-carnivorous ones. No change in P(a), P(w) or PNUE occurred as a result
of prey capture manipulation, but treatments differed only slightly in
nutrient content. P(w) and PNUE showed a trend to be higher in reproductive
P. alpina
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and
Identification of sarracenin in four species of Sarracenia
(Sarraceniaceae), Biochemical Systematics and Ecology, Volume 28, Issue 2,
March 2000, Pages 193-195
Tyree Newman, Sayed Ibrahim, James W. Wheeler, W. B. McLaughlin, Raymond L.
Petersen and Richard M. Duffield
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Bonne lecture, sorry good reading !
Fabien ZUNINO
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