Related Experiment Video
Updated: May 11, 2026
15:19
Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
Published on: June 22, 2014
10.7K
MpMLO1 controls sperm discharge in liverwort
Meng-Xing Cao1,2, Shi-Zhen Li1,2, Hong-Ju Li3,4,5
1Key Laboratory of Seed Innovation, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
Nature Plants
|June 3, 2024
Summary
A newly identified protein, MpMLO1, is crucial for sperm release in liverworts. It triggers programmed cell death in antheridial tip cells, enabling sperm discharge and aiding plant evolution.
Area of Science:
- Plant Reproduction
- Bryophyte Biology
- Molecular Mechanisms
Background:
- Bryophyte sexual reproduction requires motile sperm release from gametophytes.
- Water dependency for sperm release in liverworts is known since 1856, but molecular mechanisms were unclear.
Purpose of the Study:
- To identify the molecular factors controlling sperm discharge in the model liverwort Marchia polymorpha.
- To elucidate the mechanism of water-dependent sperm release.
Main Methods:
- Identification of MpMLO1 as a key plasma membrane protein in Marchia polymorpha.
- Analysis of MpMLO1 function in antheridial tip cells and its role in programmed cell death.
- Investigation of cytosolic Ca2+ dynamics in relation to MpMLO1 activity.
Main Results:
- MpMLO1 is essential for sperm discharge from antheridia.
- MpMLO1 triggers programmed cell death in antheridial tip cells, facilitating sperm release.
- Absence of MpMLO1 reduces Ca2+ levels, inhibits cell death, and prevents sperm discharge.
Conclusions:
- MpMLO1-mediated programmed cell death in antheridial tip cells is vital for sperm release in bryophytes.
- Cytosolic Ca2+ dynamics regulate this process, essential for sexual reproduction.
- Findings offer insights into early terrestrial plant evolution.
Related Concept Videos
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
01:41Spermatogenesis
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...