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NOTES

A hand-held porometer for rapid assessment of leaf conductance in wheat

^a CSIRO Plant Industry, P.O. Box 1600, Canberra ACT 2601, Australia
^b USDA-ARS, P.O. Box 5367, Crop Sci. Res. Lab., P.O. Box 5367, Mississippi State, MS 39762 USA
^c Australian National Univ., P.O. Box 475, Canberra ACT 2601, Australia

g.rebetzke{at}pi.csiro.au

Grain yield in bread wheat (Triticum aestivum L.) has been associated with variation in leaf stomatal conductance. However, breeding programs have been reluctant to exploit this relationship because the equipment required is either too costly or too slow for assessing large breeding populations. This study compared a new hand-held viscous-flow porometer against a steady-state diffusion porometer for leaf conductance measured on progeny derived from widely varying conductance wheats, `Quarrion' and `Genaro 81'. Leaf conductance values from the two instruments were related linearly, and significant phenotypic and genotypic correlations were obtained across sampling days, suggesting the new porometer is a robust predictor of leaf diffusive conductance. The enhanced speed of the new viscous-flow porometer in evaluating variation for leaf conductance should enable wheat breeders to screen large breeding populations for leaf conductance more efficiently.

Abbreviations: r_leaf, leaf stomatal resistance to water vapor flux • r_g, genotypic correlation coefficient • r_p, phenotypic correlation coefficient • VFP, viscous-flow porometer