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AOBPreview originally published online on April 18, 2005
Annals of Botany 2005 96(1):81-89; doi:10.1093/aob/mci152
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Respiration and Reproductive Effort in Xanthium canadense

TOSHIHIKO KINUGASA*, KOUKI HIKOSAKA and TADAKI HIROSE

Graduate School of Life Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan

* For correspondence. E-mail kinugasa{at}mail.tains.tohoku.ac.jp

Received: 2 December 2004    Returned for revision: 25 January 2005    Accepted: 1 March 2005    Published electronically: 18 April 2005

• Background and Aims The proportion of resources devoted to reproduction in the plant is called the reproductive effort (RE), which is most commonly expressed as the proportion of reproductive biomass to total plant biomass production (REW). Reproductive yield is the outcome of photosynthates allocated to reproductive structures minus subsequent respiratory consumption for construction and maintenance of reproductive structures. Thus, REW can differ from RE in terms of photosynthates allocated to reproductive structures (REP).

• Methods Dry mass growth and respiration of vegetative and reproductive organs were measured in Xanthium canadense and the amount of photosynthates and its partitioning to dry mass growth and respiratory consumption were determined. Differences between REW and REP were analysed in terms of growth and maintenance respiration.

• Key Results The fraction of allocated photosynthates that was consumed by respiration was smaller in the reproductive organ than in the vegetative organs. Consequently, REP was smaller than REW. The smaller respiratory consumption in the reproductive organ resulted from its shorter period of existence and a seasonal decline in temperature, as well as a slower rate of maintenance respiration, although the fraction of photosynthates consumed by growth respiration was larger than in the vegetative organs.

• Conclusions Reproductive effort in terms of photosynthates (REP) was smaller than that in terms of biomass (REW). This difference resulted from respiratory consumption for maintenance, which was far smaller in the reproductive organ than in vegetative organs.

Key words: Allocation, construction cost, growth respiration, maintenance respiration, reproductive effort, reproductive yield, Xanthium canadense


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