Journal
PLANT CELL AND ENVIRONMENT
Volume 33, Issue 7, Pages 1176-1185Publisher
WILEY
DOI: 10.1111/j.1365-3040.2010.02138.x
Keywords
Hordeum vulgare; leaf internal conductance; photosynthesis; stomatal conductance; water use efficiency
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Funding
- Foundation for Arable Research [0809-85-005 A]
- Landcare Research Capability Fund
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Leaf internal, or mesophyll, conductance to CO2 (g(m)) is a significant and variable limitation of photosynthesis that also affects leaf transpiration efficiency (TE). Genotypic variation in g(m) and the effect of g(m) on TE were assessed in six barley genotypes (four Hordeum vulgare and two H. bulbosum). Significant variation in g(m) was found between genotypes, and was correlated with photosynthetic rate. The genotype with the highest g(m) also had the highest TE and the lowest carbon isotope discrimination as recorded in leaf tissue (Delta(p)). These results suggest g(m) has unexplored potential to provide TE improvement within crop breeding programmes.
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