Professor Howard Griffiths
Brief cv
| 2000-present | Elected Chair in Plant Ecology, University of Cambridge | 
|
| 2002-present | Fellow of Clare College, Cambridge. | |
| 2003 | Joint organiser BES/SEB International Symposium 'Carbon Balance of Forest Biomes' | |
| 2004 | Chairman/Discussion leader, International Photosynthesis Congress, Montreal | |
| 2005 | Organiser: SEB Barcelona (Drought tolerance); IBC Vienna (Epiphytes and climate change); Discussion leader, Gordon Conference, Aussois, France; | |
| 2006 | Visiting Research Fellow, RSBS, Canberra | |
| 2007 | Organiser, C4-CAM satellite meeting to International photosynthesis congress | |
| 2007 | Member, NERC Peer Review College | |
| 2008 | Visiting Research Fellow, RSBS, Canberra | |
| 1981, 1983, 1985,1990, 1992, 1995, 1998, 2003, 2004- | Leader of expeditions for field work in Trinidad, Venezuela and Panama using stable isotopes to investigate carbon balance, drought tolerance and water vapour exchanges for forests and epiphytes. |
Ongoing Research
Stable isotopes and coupling of carbon and hydrological cycles
Stable isotopes provide non-invasive biological and ecological markers of metabolic and atmospheric transformations of water and carbon dioxide, coupling plant carbon uptake and sequestration into biomass as a function of water availability and use (Griffiths & Jarvis 2005; Griffiths et al 2000; Tcherkez et al. 2007). We are evaluating plant growth under marginal habitats for the selection of drought tolerant cultivars and perennial biomass crops, such as Miscanthus, and their impact on canopy water use. Armed with a framework of quantitative models which allow plant gas exchanges to be modelled from the scale of leaf to crop (or forest) canopy, we can partition 13C/12C and 18O/16O to reveal net carbon sequestration over a plantation crop, as a function of soil respiratory losses. We use real-time, dynamic models of stable isotopes to monitor such exchanges (Tcherkez et al. 2007; Kromdijk et al 2008). Furthermore, with for every 3 CO2 entering a leaf, 2 retro-diffuse to create an isotopic imprint in atmospheric CO2, then the equivalent inward flux of water vapour must be 10 or 100 times greater at high humidity: Helliker and Griffiths, 2007) . Finally, an enduring interest in carbon concentrating mechanisms (CAM (Griffiths et al 2007), C4 (Marshall et al 2007), and the biophysical CCM in algae, cyanobacteria, lichens and hornworts has led us to investigate the structure, function and molecular basis to the chloroplast pyrenoid (Meyer et al 2008).
The focus of our recent work has been in the following key areas which integrate carbon partitioning and water use:
- scaling fractionation from photosynthetic and (photo)respiratory metabolism and water use; eddy flux partitioning and coupling of Miscanthus crop canopy CO2 exchanges (Wanne, see Kromdijk et al 2008)
- systems biology concepts for modelling isotopic landscapes and isotopomics (Tcherkez et al 2007);
- stable isotopic markers and the genetic basis to drought tolerance in brassicas, maize and sugar beet (Abazar, see Rajabi et al 2007; Hall et al 2005; Price et al 2002)
- Chloroplast pyrenoid: molecular definition of an enigmatic organelle (Moritz, see Meyer et al, 2008)
- soil respiration and carbon balance of tropical soils; plant competition and vegetation dynamics (Jankju-Borzelabad and Griffiths 2006) ;
- hydrology of tropical epiphytes and cloudforest formations: markers of climatic gradients (Helliker and Griffiths, 2007; Reyes-Garcia et al 2008, in review) see Aline Horwath;
- photosynthetic and oxidative interplay between chloroplast and mitochondria (Changfang Zhou, see also Janneke Balke)
Recent and forthcoming publications
Seibt U, Rajabi A., Griffiths H. & Berry J (2008) Carbon isotopes and water use efficiency - Sense and sensitivity, Oecologia, DOI 10.1007/s00442-007-0932-7; for an interactive model, go to: carbonisotopes.googlepages.com
Kromdijk J, Albanito F, Fitton N, Lanigan G, Finnan J, Carroll M, Jones M, Schepers H and Griffiths H Geophysical Research Abstracts,(submitted) Vol. 10, EGU2008-A-00000, 2008 Is CO2-uptake by C4-grass canopies limited by leakage of CO2 from bundle sheath cells?
Meyer M, Seibt U, Griffiths H (2008) To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life-forms. Submitted to Proceedings of “Photosynthetic and Atmospheric Evolution”, Royal Society Discussion Meeting, November 12-13th 2007, organised by Professor Euan Nisbet, Dr Derek Bendall, Professor Christopher Howe and Dr Ellen Nisbet.
Reyes-Garcia C., Mejia-Chang M. Jones GD & Griffiths H (2008) Water vapour isotopic exchange by epiphytic bromeliads in tropical dry forests: from niche differentiation to climate reconstruction. Revised, submitted to PC&E
Rajabi, A. Griffiths H. & Ober E.S. (2008) Carbon isotope discrimination in sugar beet: stability across environments and potential surrogate measures. Field Crops Research, under revision
Reyes-García C., Griffiths H., Rincón E. & Huante P. (2008) Niche differentiation in tank and atmospheric epiphytic bromeliads of a seasonally dry forest. Biotropica, In press.
Reyes-Garcia C. & Griffiths H. (2007) Ecophysiological Studies of Perennials in a Dry Forest – Strategies for Survival In Perspectives in biophysics and plant ecology: a tribute to Park S. Nobel, (eds. E. De la Barrera & W.K. Smith), In press.
Marshall D.M., Muhaidat R., Brown N.J., Liu Z., Stanley S., Griffiths H., Sage R.F. & Hibberd J.M. (2007) Cleome, a genus closely related to Arabidopsis, contains species spanning a developmental progression from C3 to C4 photosynthesis. The Plant Journal, 51, 886-896
Tcherkez G, Ghashghaie J & Griffiths H (2007) An added dimension to stable isotope analyses integrates outputs from plant and earth systems Plant Cell & Environment 30, 887- 891 doi: 10.1111/j.1365-3040.2007.01687.x
Griffiths H, Cousins A, Badger M, von Caemmerer S (2007) Discrimination in the dark: resolving the interplay between metabolic and physical constraints to PEPC activity during the CAM cycle. Plant Physiology 147, 1055- 1067 doi/10.1104/pp.106.088302
Helliker B ,Griffiths H (2007) Towards a plant-based proxy for the 18O content of atmospheric water vapour. Global Change Biology 13, 723–733, doi: 10.1111/j.1365-2486.2007.01325.x
Hemming D., Griffiths H., Loader N.J., Marca A.,Robertson I., Williams D.G., Wingate L. Yakir D. The future of large-scale isotope networks In: Stable Isotopes as Indicators of Ecological Change T.E. Dawson, and R.T.W. Siegwolf (Eds.), Terrestrial Ecology Series, Elsevier, Amsterdam, Boston
Rajabi, A., Ober, E.S., Griffiths, H., Kromdijk, W., Pidgeon, J.D., 2007. Genetic characteristics of water-use related traits in sugar beet. Euphytica. DOI 10.1007/s10681-007-9520-5).
Lanigan GJ, Davis PA, Osborne BA, Griffiths H, Burke J, Clifton-Brown J and Jones MB (2008) Partitioning of Net Ecosystem Exchange associated with a Spring Barley (Hordeum vulgare) crop – evidence for light inhibition of respiration at a stand scale.
Griffiths H (2006) Designs on Rubisco Nature 441, 940-941
Jankju-Borzelebad, M, Griffiths H (2006) Competition for pulsed resources: an experimental study of establishment and coexistence for an arid-land grass Oecologia 148, 555-563
Griffiths H, Jarvis PG (2005) The Carbon Balance of Forest Biomes. Taylor and Francis, pp. 356 ISBN 1 85996 214 9
Hall, NM, Griffiths H Corlett J, Jones HG, Lynn J, King GJ (2005) Relationship between water use traits and photosynthesis in Brassica oleracea revealed by quantitative genetic analysis Plant Breeding 124, 557-564
Ghashghaie J Badeck F Lanigan G Nogues S Tcherkez G Deleens E, Cornic G and Griffiths H (2003) Carbon isotope fractionation during dark respiration and photorespiration. Phytochemistry Reviews 2, 145-162
Haslam R, Borland AM, Maxwell K, Griffiths H (2003) Physiological responses of the CAM epiphyte Tillandsia usneoides L. (Bromeliaceae) to variations in light and water supply. Journal of Plant Physiology, 160, 627-634.
Dodd AN, Griffiths H, Taybi T, Cushman JC and BorlandAM (2003) Integrating diel starch metabolism with the circadian and environmental regulation of Crassulacean acid metabolism in Mesembryanthemum crystallinum Planta 216: 789-797
Brendel O Handley LL and Griffiths H (2003) The δ13C of scots Pine (Pinus sylvestris L.) needles: intra-branch and temporal variations. Annals of Forest Science, 60, 97-104
Maguas C and Griffiths H (2002) Applications of stable isotopes in plant ecology. In Progress in Botany, ed Beyschlag et al, 64, 472-505
Brendel O, Handley LL and Griffiths H (2002) Differences in δ13C and diameter growth among remnant Scots pine populations in Scotland. Tree Physiology 22 983-992 2002
Dodd AN, Borland AM, Haslam RP, Griffiths H and Maxwell K (2002) Crassulacean acid metabolism: plastic, fantastic. Journal of experimental Botany, 53, 1-12.
Price AH, Cairns, JE, Horton P, Jones HG and Griffiths H (2002) Linking drought-resistance mechanisms to drought avoidance in upland rice using a QTL approach: progress and new opportunities to integrate stomatal and mesophyll responses. Journal of experimental Botany, 53, 989-1004.
Pierce S, Winter K and Griffiths H (2002) The role of CAM in high rainfall cloudforests: an in situ comparison of photosynthetic pathways in Bromeliaceae. Plant Cell and Environment, 25, 1181- 1189
Griffiths, H et al (2000) Stable isotopes reveal exchanges between soil, plants and the atmosphere. In: Physiological Plant Ecology (eds MC Press, JD Scholes and MG Barker) Blackwells, pp 415-441