Abstract
The advantages of androgenesis from Lolium × Festuca hybrids as a means towards enhanced gene expression and capture of rare genetic variation are reviewed. New evidence is presented for the technique’s use in combination with introgression-mapping for targeting Festuca-derived genes for enhanced freezing-tolerance. As a starting point, a dihaploid genotype derived by androgenesis from a Lolium multiflorum × Festuca pratensis amphiploid (2n = 4x = 28) hybrid cultivar is used as female parent in a backcross breeding programme with L. multiflorum (2n = 2x = 14). A derivative of the backcross␣breeding programme was a genotype of L.␣multiflorum (2n = 2x = 14) incorporating a F.␣pratensis introgression on chromosome 4 that was more freezing-tolerant than Lolium.
New evidence of the importance in Lolium and Festuca species of the adaptive capabilities of Photosystem II (PSII) in relation to subsequent freezing-tolerance, is presented. Non-photochemical quenching (NPQ) mechanisms for expulsion of excess light energy during cold acclimation are found in F. pratensis but not in L. multiflorum. Screens of a backcross population derived from an initial dihaploid genotype (n + n = 14) produced by androgenesis from a L. multiflorum × F.␣pratensis amphiploid, indicate a direct relationship between cold acclimation induced increases in NPQ and freezing-tolerance. Preliminary evidence of a role for genes found on chromosome 4 of F. pratensis for increased NPQ expression, is presented.
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Abbreviations
- F 0, F 0′:
-
Fluorescence of dark and light adapted leaves, respectively when all PSII reaction centres are open
- F v :
-
Variable fluorescence (F v = F m − F 0)
- F m , F m′:
-
Fluorescence when all PSII reaction centres are closed in dark and light-exposed leaves, respectively
- F s :
-
Steady state fluorescence in light exposed leaves
- F v/F m :
-
Maximum quantum yield of Photosystem II (PSII)
- PPFD:
-
Photosynthetic photon flux density
- NPQ:
-
Non-photochemical quenching of chlorophyll a fluorescence
- q p :
-
Photochemical quenching of chlorophyll a fluorescence
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Humphreys, M.W., Gasior, D., Lesniewska-Bocianowska, A. et al. Androgenesis as a means of dissecting complex genetic and physiological controls: selecting useful gene combinations for breeding freezing tolerant grasses. Euphytica 158, 337–345 (2007). https://doi.org/10.1007/s10681-006-9240-2
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DOI: https://doi.org/10.1007/s10681-006-9240-2