Protocol for obtaining doubled haploids in isolated microspore culture for poorly responsive genotypes of brassicaceae family.

In this protocol for obtaining doubled haploids plants (DH), we propose a new method for microspore isolation. This method is useful for genotypes of the Brassicaceae family with low responsiveness to DH technology. For such crops, it allows increasing the embryo yield several times and sometimes obtaining embryos for the first time. This method of microspore isolation reduces the mechanical impact on the bud tissue, which minimizes somatic cell destruction and reduces to get it into the preparation through the filter, thus increasing its purity. The new isolation method also increases the relative concentration of embryogenic microspores in the preparation. This is possible because the anther tissues are not destroyed during the isolation process. Therefore, the anther retains its structure and microspores of early and late stages are trapped by the anther tissue, thus the anther acts as a sieve. Late stages are trapped because of their larger size, while early stages are trapped because they are even more tightly bound to the anther tissue. Together, these factors increase the efficiency of the technology for DH production microspore culture. This protocol article provides a detailed experimental protocol to the method presented in the experimental article (E.V. Kozar, E.G. Kozar, E.A. Domblides. Effect of the Method of Microspore Isolation on the Efficiency of Isolated Microspore Culture In Vitro for Brassicaceae Family. Horticulturae. 2022. Vol. 8, No. 10. P. 864. DOI 10.3390/horticulturae8100864) but does not repeat all the results documenting the efficacy of the actual method.