Protocol: an improved method for inducing sporophyte generation in the model moss Physcomitrium patens under nitrogen...

Area of Science:

• Plant Biology
• Developmental Biology
• Genetics

Background:

• Land plants have a haplodiplontic life cycle with distinct haploid and diploid generations.
• Bryophytes, like the model moss Physcomitrium (Physcomitrella) patens, exhibit a haploid-dominant life cycle.
• Conventional sporophyte induction in P. patens relies on lengthy culturing, often using Jiffy-7 pellets that are difficult to sterilize.

Purpose of the Study:

• To develop a more efficient and accelerated protocol for inducing diploid sporophytes in Physcomitrium (Physcomitrella) patens.
• To optimize conditions for studying the entire life cycle of P. patens, facilitating evolutionary developmental research.

Main Methods:

• Investigated the impact of nitrogen availability on P. patens growth and development.
• Developed a two-step protocol using a BCD-based solid culture medium, eliminating the need for Jiffy-7 pellets.
• Optimized temperature, light conditions, and nitrogen levels for sporophyte induction.

Main Results:

• Nitrogen-free conditions significantly promote gametangia and subsequent sporophyte formation in P. patens.
• The improved protocol shortens the sporophyte induction period and reduces the required culture space.
• Eliminated the use of Jiffy-7 pellets, simplifying the sterilization process.

Conclusions:

• The developed protocol offers a more efficient and streamlined method for sporophyte induction in P. patens.
• This advancement will accelerate research on fertilization and the diploid sporophyte generation in this key model organism.
• Facilitates broader studies in plant evolutionary developmental biology using P. patens.