Abstract
Albinism remains a major problem in cereal improvement programs that rely on doubled haploid (DH) technology, and the factors controlling the phenomenon are not well understood. Here we report on the positive influence of copper on the production of DH plants obtained through microspore embryogenesis (ME) in recalcitrant cultivars of barley (Hordeum vulgare L.). The presence of copper sulphate in the anther pre-treatment medium improved green DH plant regeneration from cultivars known to produce exclusively albino plants using classical procedures. In plastids, the effect of copper was characterized by a decrease in starch and a parallel increase in internal membranes. The addition of copper sulphate in the ME pre-treatment medium should enable breeders to exploit the genetic diversity of recalcitrant cultivars through DH technology. We examined programmed cell death (PCD) during microspore development to determine whether PCD may interfere with the induction of ME and/or the occurrence of albinism. By examining the fate of nuclei in various anther cell layers, we demonstrated that the kinetics of PCD in anthers differed between the barley cultivars Igri and Cork that show a low and a high rate of albinism, respectively. However, no direct correlation between PCD in the anther cell layers and the rate of albinism was observed and copper had no influence on the PCD kinetic in these cultivars. It was concluded that albinism following ME was not due to PCD in anthers, but rather to another unknown phenomenon that appears to specifically affect plastids during microspore/pollen development.
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Abbreviations
- cv.:
-
Cultivar
- cvs.:
-
Cultivars
- DH:
-
Doubled haploid
- End:
-
Endothecium
- Ep:
-
Epidermis
- MDE:
-
Microspore-derived embryo
- ME:
-
Microspore embryogenesis
- ML:
-
Middle layers
- MMC:
-
Microspore mother cell
- MPG:
-
Mature pollen grain
- PCD:
-
Programmed cell death
- SE:
-
Standard error
- T:
-
Tapetum
- VM:
-
Vacuolated microspore
- YM:
-
Young microspore
- YPG:
-
Young pollen grain
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The authors thank Ms. Kim Boutilier for improving the English.
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Communicated by P. Ozias-Akins.
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Jacquard, C., Nolin, F., Hécart, C. et al. Microspore embryogenesis and programmed cell death in barley: effects of copper on albinism in recalcitrant cultivars. Plant Cell Rep 28, 1329–1339 (2009). https://doi.org/10.1007/s00299-009-0733-z
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DOI: https://doi.org/10.1007/s00299-009-0733-z