在不同湿地环境中，食肉猪笼草紫瓶子草的养分限制与形态可塑性

Nutrient limitation and morphological plasticity of the carnivorous pitcher plant Sarracenia purpurea in contrasting wetland environments.

作者信息

Bott Terry, Meyer Gretchen A, Young Erica B

机构信息

Department of Biological Sciences, University of Wisconsin - Milwaukee, PO Box 413, Milwaukee, WI 53201, USA.

Field Station, University of Wisconsin - Milwaukee, 3095 Blue Goose Road, Saukville, WI 53080, USA.

出版信息

New Phytol. 2008;180(3):631-641. doi: 10.1111/j.1469-8137.2008.02575.x. Epub 2008 Jul 17.

DOI:10.1111/j.1469-8137.2008.02575.x

Abstract

Plasticity of leaf nutrient content and morphology, and macronutrient limitation were examined in the northern pitcher plant, Sarracenia purpurea subsp. purpurea, in relation to soil nutrient availability in an open, neutral pH fen and a shady, acidic ombrotrophic bog, over 2 yr following reciprocal transplantation of S. purpurea between the wetlands. * In both wetlands, plants were limited by nitrogen (N) but not phosphorus (P) (N content < 2% DW(-1), N : P < 14) but photosynthetic quantum yields were high (F(V)/F(M) > 0.79). Despite carnivory, leaf N content correlated with dissolved N availability to plant roots (leaf N vs , r(2) = 0.344, P < 0.0001); carnivorous N acquisition did not apparently overcome N limitation. * Following transplantation, N content and leaf morphological traits changed in new leaves to become more similar to plants in the new environment, reflecting wetland nutrient availability. Changes in leaf morphology were faster when plants were transplanted from fen to bog than from bog to fen, possibly reflecting a more stressful environment in the bog. * Morphological plasticity observed in response to changes in nutrient supply to the roots in natural habitats complements previous observations of morphological changes with experimental nutrient addition to pitchers.

摘要

在将紫瓶子草（Sarracenia purpurea subsp. purpurea）在两个湿地之间进行相互移栽后的两年里，研究了其叶片养分含量和形态的可塑性以及大量养分限制，这与开阔、中性pH值的富营养湿地和阴暗、酸性的雨养泥炭沼泽中的土壤养分有效性有关。在这两个湿地中，植物都受到氮（N）的限制，但不受磷（P）的限制（N含量<2%干重-1，N:P<14），但光合量子产量很高（F(V)/F(M)>0.79）。尽管存在食肉性，但叶片N含量与植物根系可利用的溶解N相关（叶片N与，r(2)=0.344，P<0.0001）；食肉性N获取显然没有克服N限制。移栽后，新叶中的N含量和叶片形态特征发生变化，变得更类似于新环境中的植物，这反映了湿地养分的有效性。当植物从富营养湿地移栽到泥炭沼泽时，叶片形态的变化比从泥炭沼泽移栽到富营养湿地时更快，这可能反映了泥炭沼泽中压力更大的环境。在自然栖息地中观察到的响应根系养分供应变化的形态可塑性补充了先前通过向捕虫器添加实验性养分观察到的形态变化。