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門派: 殺豬拔毛派(萌主)
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註冊: 2001/12/06
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 Message  查看  搜尋  通訊錄  複製  引用  回覆 | [第 17 樓] |
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The roots of carnivorous plants
abstract
Carnivorous plants may benefit from animal-derived nutrients to supplement minerals from the soil. Therefore, the role and importance of their roots is a matter of debate. Aquatic carnivorous species lack roots completely, and many hygrophytic and epiphytic carnivorous species only have a weakly developed root system. In xerophytes, however, large, extended and/or deep-reaching roots and sub-soil shoots develop. Roots develop also in carnivorous plants in other habitats that are hostile, due to flooding, salinity or heavy metal occurance. Information about the structure and functioning of roots of carnivorous plants is limited, but this knowledge is essential for a sound understanding of the plants' physiology and ecology. Here we compile and summarise available information on:
(1) The morphology of the roots.
(2) The root functions that are taken over by stems and leaves in species without roots or with poorly developed root systems; anchoring and storage occur by specialized chlorophyll-less stems; water and nutrients are taken up by the trap leaves.
(3) The contribution of the roots to the nutrient supply of the plants; this varies considerably amongst the few investigated species. We compare nutrient uptake by the roots with the acquisition of nutrients via the traps.
(4) The ability of the roots of some carnivorous species to tolerate stressful conditions in their habitats; e.g., lack of oxygen, saline conditions, heavy metals in the soil, heat during bushfires, drought, and flooding.
source
Adlassnig, W., Peroutka, M., Lambers, H., and Lichtscheidl, I. K. Plant and Soil, 2005, 274: 127-140.
link
http://springerlink.metapress.com/(dzplfibyp3xnyz55ghy2fy45)/app/home/contribution.asp?referrer=parent&backto=issue,7,15;journal,5,485;linkingpublicationresults,1:100326,1
標題
食蟲植物的根
摘要
食蟲植物能夠從動物身上的養份來獲得土壞裡的礦物質。因此，它們根部的作用及重要性就成為爭論的焦點。水生的食蟲植物完全缺乏根部，溼生及著生的食蟲植物則擁有發育不良的根系。不過，旱生食蟲植物則發展出大型、伸展的或是深根，或是半埋在土裡的莖。另外，因為生長環境遭遇到水災、鹽份或重金屬時，則不利於食蟲植物的根部發育。關於食蟲植物根部的結構及功能方面的資料很有限，然而這個知識對於完整的植物生理學及植物生態學是不可或缺的。在此我們收集並總結可得的資料於下列幾點：
(1) 根部的型態。
(2) 無根及根系發育不良者其根部的功能；針對莖部不含葉綠素的種類其根部固定能力及養份儲藏能力；從捕蟲葉上獲得水及養份的能力。
(3) 根部對植物養份的供應上之貢獻；在少數被研究的對象之中，根部的功能差異相當大，我們比較養份的獲得在經由根部及捕蟲葉上之間的差異。
(4) 一些食蟲植物的根部在其棲地中對環境壓力的忍受能力；例如：缺氧、有鹽份的環境、土壤裡的重金屬、野火帶來的熱、乾旱及淹水。
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 2006/01/21 02:30pm  IP: 已設定保密 | [本文共 2848 位元組]  |
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