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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Variation in key leaf photosynthetic traits across wheat wild relatives is accession-dependent not species-dependent
AU - McAusland, Lorna
AU - Vialet-Chabrand, Silvere
AU - Jauregui, Ivan
AU - Burridge, Amanda
AU - Hubbart-Edwards, Stella
AU - Fryer, Mike
AU - King, Ian
AU - King, Julie
AU - Pyke, Kevin
AU - Edwards, Keith
AU - Carmo-Silva, Elizabete
AU - Lawson, Tracy
AU - Murchie, Erik
PY - 2020/11/23
Y1 - 2020/11/23
N2 - The wild relatives of modern wheat represent an under-utilised source of genetic and phenotypic diversity and are of interest in breeding due to their wide adaptation to diverse environments. Leaf photosynthetic traits underpin the rate of production of biomass and yield and have not been systematically explored in the wheat relatives.This paper identifies and quantifies the phenotypic variation in photosynthetic, stomatal and morphological traits in up to 88 wheat wild relative accessions across five genera. Both steady state measurements and dynamic responses to step-changes in light intensity are assessed.2.3-fold variation for flag leaf light and CO2- saturated rates of photosynthesis (Amax) was observed. Many accessions showing higher and more variable Amax, maximum rates of carboxylation (Vcmax), electron transport (Jmax) and Rubisco activity when compared to modern genotypes. Variation in dynamic traits was also significant; with distinct genus-specific trends in rates of induction of non-photochemical quenching (NPQ) and rate of stomatal opening (k).We conclude that utilization of wild relatives for improvement of photosynthesis is supported by the existence of a high degree of natural variation in key traits and should consider not only genus-level properties but variation between individual accessions.
AB - The wild relatives of modern wheat represent an under-utilised source of genetic and phenotypic diversity and are of interest in breeding due to their wide adaptation to diverse environments. Leaf photosynthetic traits underpin the rate of production of biomass and yield and have not been systematically explored in the wheat relatives.This paper identifies and quantifies the phenotypic variation in photosynthetic, stomatal and morphological traits in up to 88 wheat wild relative accessions across five genera. Both steady state measurements and dynamic responses to step-changes in light intensity are assessed.2.3-fold variation for flag leaf light and CO2- saturated rates of photosynthesis (Amax) was observed. Many accessions showing higher and more variable Amax, maximum rates of carboxylation (Vcmax), electron transport (Jmax) and Rubisco activity when compared to modern genotypes. Variation in dynamic traits was also significant; with distinct genus-specific trends in rates of induction of non-photochemical quenching (NPQ) and rate of stomatal opening (k).We conclude that utilization of wild relatives for improvement of photosynthesis is supported by the existence of a high degree of natural variation in key traits and should consider not only genus-level properties but variation between individual accessions.
KW - wheat
KW - Triticum aestivum
KW - Genotyping
KW - Photosynthesis
KW - Wild relatives
KW - Stomata
KW - Rubisco
U2 - 10.1111/nph.16832
DO - 10.1111/nph.16832
M3 - Journal article
VL - 228
SP - 1767
EP - 1780
JO - New Phytologist
JF - New Phytologist
SN - 0028-646X
IS - 6
ER -