TY - JOUR
T1 - Variability in mesophyll conductance between barley genotypes, and effects on transpiration efficiency and carbon isotope discrimination
AU - Barbour, Margaret M.
AU - Warren, Charles R.
AU - Farquhar, Graham D.
AU - Forrester, Guy
AU - Brown, Hamish
PY - 2010/7
Y1 - 2010/7
N2 - Leaf internal, or mesophyll, conductance to CO2 (gm) is a significant and variable limitation of photosynthesis that also affects leaf transpiration efficiency (TE). Genotypic variation in gm and the effect of gm on TE were assessed in six barley genotypes (four Hordeum vulgare and two H. bulbosum). Significant variation in gm was found between genotypes, and was correlated with photosynthetic rate. The genotype with the highest gm also had the highest TE and the lowest carbon isotope discrimination as recorded in leaf tissue (Δp). These results suggest gm has unexplored potential to provide TE improvement within crop breeding programmes.
AB - Leaf internal, or mesophyll, conductance to CO2 (gm) is a significant and variable limitation of photosynthesis that also affects leaf transpiration efficiency (TE). Genotypic variation in gm and the effect of gm on TE were assessed in six barley genotypes (four Hordeum vulgare and two H. bulbosum). Significant variation in gm was found between genotypes, and was correlated with photosynthetic rate. The genotype with the highest gm also had the highest TE and the lowest carbon isotope discrimination as recorded in leaf tissue (Δp). These results suggest gm has unexplored potential to provide TE improvement within crop breeding programmes.
KW - Hordeum vulgare
KW - Leaf internal conductance
KW - Photosynthesis
KW - Stomatal conductance
KW - Water use efficiency
UR - http://www.scopus.com/inward/record.url?scp=77954747235&partnerID=8YFLogxK
U2 - 10.1111/j.1365-3040.2010.02138.x
DO - 10.1111/j.1365-3040.2010.02138.x
M3 - Article
SN - 0140-7791
VL - 33
SP - 1176
EP - 1185
JO - Plant, Cell and Environment
JF - Plant, Cell and Environment
IS - 7
ER -