EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Carbohydrate sources and sinks in woody plants


Botanical Review. 58(2): 107-222
Carbohydrate sources and sinks in woody plants
Each perennial woody plant is a highly integrated system of competing carbohydrate sinks (utilization sites). Internal competition for carbohydrates is shown by changes in rates of carbohydrate movement from sources to sinks and reversals in direction of carbohydrate transport as the relative sink strengths of various organs change. Most carbohydrates are produced in foliage leaves but some are synthesized in cotyledons, hypocotyls, buds, twigs, stems, flowers, fruits, and strobili. Although the bulk of the carbohydrate pool moves to sinks through the phloem, some carbohydrates are obtained by sinks from the xylem sap. Sugars are actively accumulated in the phloem and move passively to sinks along a concentration gradient. The dry weight of a mature woody plant represents only a small proportion of the photosynthate it produced. This discrepancy results not only from consumption of plant tissues by herbivores and shedding of plant parts, but also from depletion of carbohydrates by respiration, leaching, exudation, secretion, translocation to other plants through root grafts and mycorrhizae and losses to parasites. Large spatial and temporal variations occur in the use of reserve- and currently produced carbohydrates in metabolism and growth of shoots, stems, roots, and reproductive structures. A portion of the carbohydrate pool is diverted for production of chemicals involved in defense against fungi, herbivores, and competing plants. Woody plants accumulate carbohydrates during periods of excess production and deplete carbohydrates when the rate of utilization exceeds the rate of production. Stored carbohydrates play an important role in metabolism, growth, defense, cold hardiness, and postponement or prevention of plant mortality.

Accession: 002042929

DOI: 10.1007/bf02858600

Download PDF Full Text: Carbohydrate sources and sinks in woody plants



Related references

Remote sensing estimates of boreal and temperate forest woody biomass: Carbon pools, sources, and sinks. Remote Sensing of Environment 84(3): 393-410, March, 2003

Regulation of sources and sinks in crop plants. Monograph, British Plant Growth Regulator Group (12): 295, 1985

Regulation of sources and sinks in crop plants (book review). Journal of Experimental Botany 37: 5, 1986

Sources fluxes and sinks of nitrogen during the reproductive growth phase of maize zea mays plants. Plant Physiology (Rockville) 65(6 SUPPL): 60, 1980

Short-chain oxygenated VOCs: Emission and uptake by plants and atmospheric sources, sinks, and concentrations. Atmospheric Environment 41(12): 2477-2499, 2007

Sources, sinks and pseudo-sinks. Journal of Animal Ecology 64(1): 126-130, 1995

Polycyclic aromatic hydrocarbons in the atmosphere: monitoring, sources, sinks and fate. II: Sinks and fate. Annali di Chimica 94(4): 257-268, 2004

Carbohydrate and nitrogen changes during spring growth of woody plants. Plant Physiol, 44: Suppl, 4, 1969

Sources and collections of woody forest plants. CRC Handbook of biosolar resources Volume I Part 1 Basic principles: 597-598, 1982

Calcium and magnesium sources for woody plants. American Nurseryman 167(7): 123, 1988