Effects of elevated pO3 on carbon cycle between above and belowground organs of trees.

Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Research Abstract Details 

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Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Abstract Text:

Xi-ping Liu,Rennenberg Heinz,Matyssek Rainer,

Translocation of carbohydrate from leaves to roots via phloem and reallocation from roots to leaves via xylem regulate the allocation of carbon (C) between above and belowground organs of trees. To quantitatively analyze effects of elevated ozone concentrations pO3 on the internal cycle of C, juvenile beech and spruce were grown in phytotrons and exposed to ambient and elevated pO3 (i.e. twice-ambient O3 levels, restricted to < 150 ppb) for two growing seasons. The translocation of C in the phloem and xylem was quantitatively studied by investigating the phloem/xylem-loading of sugars, the differentiation of stem conductive tissue and the hourly water flow through the stem. Results in the present study shown, elevated pO3 significantly decreased C translocation from shoot to roots in beech by reducing both sugar concentration in the phloem and conductive phloem area. Elevated pO3 also significantly decreased C reallocation from the roots to the shoot in beech by reducing both of sugar concentration in the xylem and transpiration rate. The adverse effects of elevated pO3 on C translocation in the phloem and xylem, however, were small in spruce. Contrasting to beech, spruce is less sensitive to elevated pO3, regarding to phloem differentiation and sugar concentrations in the phloem and xylem.

Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Publishing Authors By Initials

XP Liu,R Heinz,M Rainer,

For similar plants: trees research abstracts see: plants: trees research

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Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of environmental sciences (China)

VOLUME: 18

Page Numbers: 932-6

Journal Abbreviation: J Environ Sci (China)

ISSN: 1001-0742

DAY: 8

MONTH: 02

YEAR: 2006

Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 100967627

Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Keywords Mesh Terms:

KEYWORDS: Trees

MESH TERMS: metabolism

Chemical & Substance for Abstract: Effects of elevated pO3 on carbon cycle between above and belowground organs of trees. Information

Substance Name: Carbon

Registry Number: 7440-44-0

Grant and Affiliation Information for Effects of elevated pO3 on carbon cycle between above and belowground organs of trees.

AFFILIATION: College of Life Sciences, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China. xpliuderen@sohu.com

Country: Netherlands

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MEDLINETA: J Environ Sci (China)

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