Related Experiment Videos
Isolation and cultivation of embryogenic microspores from barley (Hordeum vulgare L.)
1Department of Physiology, Carlsberg Laboratory, Copenhagen Valby, Denmark.
Abstract:
Two different techniques for mechanical isolation of microspores from the barley cultivar 'Igri' have been evaluated. The anthers were subjected to mannitol pretreatment prior to microspore isolation, which was performed either by maceration with a pestle or by blending of the excised anthers. The microspores were purified by centrifugation and washing and cultured in liquid medium on a membrane support. In the following four weeks the microspores developed into embryoids, which were subsequently regenerated to plants on solid medium. Microblending of the anthers was found to be more reproducible than pestle maceration, and the yield of large microspores was 100% higher using this method. With the microblending technique a mean of 9.4 green plants and 0.4 albino plants were regenerated per plated anther while a mean of only 2.8 green and 0.17 albino plants per anther were regenerated from microspores isolated after pestle maceration of the anthers. Microspores isolated from mass cultures were also cultured as single cells in microdroplets, and it was shown that microspores isolated from 3-5 days old mass cultures could develop into plants although at a low frequency (0.3%). Finally, the potential of using microinjection for transforming embryogenic microspores has been evaluated.
Insights
Microblending anthers significantly improves microspore isolation efficiency in barley, yielding 100% more large microspores and higher plant regeneration rates compared to pestle maceration. This method enhances barley breeding potential.
Area of Science:
- Agricultural Science
- Plant Biotechnology
- Molecular Biology
Background:
- Efficient microspore isolation is crucial for barley haploid production.
- Traditional methods like pestle maceration can be inefficient and less reproducible.
- Optimizing microspore isolation techniques is key for advancing barley breeding programs.
Purpose of the Study:
- To evaluate and compare two mechanical isolation techniques for barley microspores: pestle maceration and microblending.
- To assess the efficiency and reproducibility of each method for microspore isolation and subsequent plant regeneration.
- To explore the potential of microinjection for transforming embryogenic microspores.
Main Methods:
- Barley anthers ('Igri' cultivar) underwent mannitol pretreatment.
- Microspore isolation was performed using either pestle maceration or microblending.
- Purification involved centrifugation and washing, followed by culture on a membrane support.
- Microspores developed into embryoids and were regenerated into plants on solid medium.
Main Results:
- Microblending demonstrated higher reproducibility and a 100% greater yield of large microspores compared to pestle maceration.
- The microblending technique resulted in significantly higher regeneration rates: 9.4 green plants/anther vs. 2.8 green plants/anther.
- Microspores cultured as single cells from mass cultures showed low-frequency plant development (0.3%).
Conclusions:
- Microblending is a superior method for mechanical isolation of barley microspores, enhancing efficiency and plant regeneration.
- The optimized microspore isolation protocol facilitates haploid plant production in barley.
- Further research into microinjection for transforming embryogenic microspores holds promise for genetic improvement.