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Microspore development in cultured maize anthers
1United AgriSeeds, Inc., 61820, Champaign, IL, USA.
Abstract:
The present study follows in vivo and in vitro microspore development utilizing an anther culture-responsive maize genotype (Pa91×FR16) and a DNA-specific fluorescent dye (mithramycin). Cultured anthers were sampled at various times and scored for abnormal microspore divisions, multicellular masses, and embryo-like structures. The frequency of abnormal microspore divisions reached a peak during the first 7 days in culture and then declined. The vegetative nucleus was mitotically active in culture with over 50% of the induced microspores exhibiting this type of division. Multicellular masses and embryo-like structures first appeared in the 14 and 25 day samples, respectively. Most of the microspores did not reach the multicellular stage and an even greater mortality occurred during the formation of embryo-like structures.
Insights
This study tracked maize microspore development in vitro, finding abnormal divisions peaked early. Most microspores didn't form embryos, with high mortality during embryo-like structure development.
Area of Science:
- Plant Science
- Developmental Biology
- Genetics
Background:
- Anther culture is crucial for plant breeding and genetic studies.
- Understanding microspore development is key to optimizing haploid induction techniques.
- Maize (Zea mays) anther culture responsiveness varies significantly among genotypes.
Purpose of the Study:
- To investigate in vivo and in vitro microspore development in a responsive maize genotype.
- To characterize the timing and nature of developmental abnormalities during anther culture.
- To assess the progression from microspores to embryo-like structures.
Main Methods:
- Utilized an anther culture-responsive maize genotype (Pa91×FR16).
- Employed a DNA-specific fluorescent dye (mithramycin) for observation.
- Collected and analyzed cultured anthers at various time points.
Main Results:
- Abnormal microspore divisions peaked within the first 7 days of culture.
- The vegetative nucleus showed high mitotic activity (>50% of induced microspores).
- Multicellular masses and embryo-like structures appeared at 14 and 25 days, respectively, with significant mortality.
Conclusions:
- Early developmental stages in maize anther culture are prone to abnormalities.
- While vegetative nucleus division occurs, progression to advanced structures like embryos is limited.
- High mortality rates underscore challenges in efficient haploid induction via anther culture in this genotype.
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