NDLI: Assimilate partitioning affects $^{13}$C fractionation of recently assimilated carbon in maize

Content Provider	Springer Nature Link
Author	Werth, M. Kuzyakov, Y.
Copyright Year	2006
Abstract	Coupling $^{13}$C natural abundance and $^{14}$C pulse labelling enabled us to investigate the dependence of $^{13}$C fractionation on assimilate partitioning between shoots, roots, exudates, and CO$_{2}$ respired by maize roots. The amount of recently assimilated C in these four pools was controlled by three levels of nutrient supply: full nutrient supply (NS), 10 times diluted nutrient supply (DNS), and deionised water (DW). After pulse labelling of maize shoots in a $^{14}$CO$_{2}$ atmosphere, $^{14}$C was traced to determine the amounts of recently assimilated C in the four pools and the δ$^{13}$C values of the four pools were measured. Increasing amounts of recently assimilated C in the roots (from 8% to 10% of recovered $^{14}$C in NS and DNS treatments) led to a 0.3‰ $^{13}$C enrichment from NS to DNS treatments. A further increase of C allocation in the roots (from 10% to 13% of recovered $^{14}$C in DNS and DW treatments) resulted in an additional enrichment of the roots from DNS to DW treatments by 0.3‰. These findings support the hypothesis that $^{13}$C enrichment in a pool increases with an increasing amount of C transferred into that pool. δ$^{13}$C of CO$_{2}$ evolved by root respiration was similar to that of the roots in DNS and DW treatments. However, if the amount of recently assimilated C in root respiration was reduced (NS treatment), the respired CO$_{2}$ became 0.7‰ $^{13}$C depleted compared to roots. Increasing amounts of recently assimilated C in the CO$_{2}$ from NS via DNS to DW treatments resulted in a 1.6‰ δ$^{13}$C increase of root respired CO$_{2}$ from NS to DW treatments. Thus, for both pools, i.e. roots and root respiration, increasing amounts of recently assimilated C in the pool led to a δ$^{13}$C increase. In DW and DNS plants there was no $^{13}$C fractionation between roots and exudates. However, high nutrient supply decreased the amount of recently assimilated C in exudates compared to the other two treatments and led to a 5.3‰ $^{13}$C enrichment in exudates compared to roots. We conclude that $^{13}$C discrimination between plant pools and within processes such as exudation and root respiration is not constant but strongly depends on the amount of C in the respective pool and on partitioning of recently assimilated C between plant pools.
Starting Page	319
Ending Page	333
Page Count	15
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	284
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	δ$^{13}$C Exudation $^{14}$C Pulse labelling Recently assimilated carbon Root respiration $^{13}$C Isotopic fractionation Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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