Root and shoot respiration of perennial ryegrass are supplied by the same substrate pools: assessment by dynamic 13C labeling and compartmental analysis of tracer kinetics.

Plant Physiology
Christoph Andreas LehmeierHans Schnyder

Abstract

The substrate supply system for respiration of the shoot and root of perennial ryegrass (Lolium perenne) was characterized in terms of component pools and the pools' functional properties: size, half-life, and contribution to respiration of the root and shoot. These investigations were performed with perennial ryegrass growing in constant conditions with continuous light. Plants were labeled with (13)CO(2)/(12)CO(2) for periods ranging from 1 to 600 h, followed by measurements of the rates and (13)C/(12)C ratios of CO(2) respired by shoots and roots in the dark. Label appearance in roots was delayed by approximately 1 h relative to shoots; otherwise, the tracer time course was very similar in both organs. Compartmental analysis of respiratory tracer kinetics indicated that, in both organs, three pools supplied 95% of all respired carbon (a very slow pool whose kinetics could not be characterized provided the remaining 5%). The pools' half-lives and relative sizes were also nearly identical in shoot and root (half-life < 15 min, approximately 3 h, and 33 h). An important role of short-term storage in supplying respiration was apparent in both organs: only 43% of respiration was supplied by current photosynthate (fixed carbon tra...Continue Reading

References

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Citations

Jun 13, 2013·Plant Physiology·Christoph Andreas LehmeierHans Schnyder
Dec 20, 2013·Radiation and Environmental Biophysics·D Galeriu, A Melintescu
Aug 7, 2009·The New Phytologist·Ulrike GamnitzerHans Schnyder
Feb 19, 2010·Current Opinion in Biotechnology·Jens NiklasElmar Heinzle
Feb 1, 2011·Plant, Cell & Environment·Margaret M BarbourHamish Brown
May 31, 2013·The New Phytologist·Edouard R A Boex-FontvieilleGuillaume G B Tcherkez
Sep 8, 2010·The New Phytologist·Christoph Andreas LehmeierHans Schnyder
Dec 2, 2010·Plant, Cell & Environment·Yann SalmonNina Buchmann
Jan 20, 2010·Plant, Cell & Environment·Guillaume TcherkezJaleh Ghashghaie
Nov 12, 2014·The New Phytologist·Roland HasibederMichael Bahn
Mar 13, 2014·Isotopes in Environmental and Health Studies·Susanne BurriNina Buchmann
Sep 15, 2018·Journal of Experimental Botany·João Henrique F CavalcantiWagner L Araújo
Aug 1, 2014·Functional Plant Biology : FPB·Yann SalmonNina Buchmann
Nov 17, 2016·Isotopes in Environmental and Health Studies·Mirjam S StuderSamuel Abiven

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