Abstract
An isolated microspore culture provides an excellent system for the study of microspore induction and embryogenesis, provides a platform for an ever-increasing array of molecular studies, and can produce doubled haploid (DH) plants, which are used to accelerate plant-breeding programs. Moreover, isolated microspore cultures have several advantages over anther culture, wherein presence of the anther walls can lead to the development of diploid, somatic calli and plants. Although protocols for isolated microspore culture vary from laboratory to laboratory, the basic steps of growing donor plants, harvesting floral organs, isolating microspores, culturing and inducing microspores, regenerating embryos, and doubling the chromosomes, remain the same. Over the past few years, a large proportion of the research reports on isolated microspore culture have focused on cereal and Brassica species. For some of these species, isolated microspore culture protocols are well established and routinely used in laboratories around the world for developing new varieties, as well as for basic research in areas such as genomics, gene expression, and genetic mapping. Although these species are considered highly responsive to microspore culture, improvements in efficiency are still being made. However, with many species, isolated microspore culture is simply not yet efficient enough at producing DH plants to be cost-effective for breeding programs. There has been a recent resurgence of haploidy research with response being reported in some species once considered recalcitrant. Future research programs aimed at elucidating pathways involved in microspore induction and embryogenesis will be of benefit, as will novel approaches to improve the efficiency of microspore culture for DH production. With many species, anther culture has proven to be more effective than isolated microspore culture, necessitating more research to clarify the contribution of the anther wall to embryogenesis. The development of molecular markers for use in determining the gametic origin of regenerated plants, irrespective of their ploidy, would also be beneficial. In this review, we aim to provide an overview of the basic isolated microspore culture protocol with an emphasis on recent progress in several crop species.
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Ferrie, A.M.R., Caswell, K.L. Isolated microspore culture techniques and recent progress for haploid and doubled haploid plant production. Plant Cell Tiss Organ Cult 104, 301–309 (2011). https://doi.org/10.1007/s11240-010-9800-y
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DOI: https://doi.org/10.1007/s11240-010-9800-y