How microspores transform into haploid embryos: changes associated with embryogenesis induction and...

Area of Science:

• Plant Biotechnology
• Developmental Biology
• Genetics

Background:

• Microspore embryogenesis is a vital process for generating haploid and doubled haploid plants, crucial for plant breeding and research.
• Successful induction requires specific, species-dependent factors to trigger the shift from gametophytic development to embryogenesis.
• This transition involves complex cellular and molecular alterations, including stress responses and the suppression of the gametophytic program.

Purpose of the Study:

• To review recent advancements in understanding the cellular and molecular changes during induced microspore reprogramming.
• To highlight the transcriptomic alterations occurring in microspores and microspore-derived embryos (MDEs).
• To compare the developmental environment and outcomes of in vitro MDEs with their in vivo zygotic counterparts.

Main Methods:

• Compilation and synthesis of recent research findings on microspore embryogenesis.
• Focus on transcriptomic analyses to identify gene expression changes.
• Comparative analysis of in vitro MDEs and zygotic embryos.

Main Results:

• Induced microspores undergo significant morphological and gene expression changes to adopt an embryogenic pathway.
• A stress-related cellular response and repression of the gametophytic program are critical for reverting microspores to totipotency.
• Transcriptomic studies reveal dynamic gene expression patterns during microspore-to-embryo transition.

Conclusions:

• Understanding microspore reprogramming provides insights into plant totipotency and developmental plasticity.
• The in vitro environment imposes unique influences on MDE development compared to zygotic embryos.
• Further research into transcriptomic and epigenetic modifications will enhance the efficiency of microspore embryogenesis for crop improvement.