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Peptide growth factor phytosulfokine-alpha contributes to the pollen population effect
Y F Chen1, Y Matsubayashi, Y Sakagami
1Laboratory of Bioactive Natural Products Chemistry, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Japan.
Planta
|November 23, 2000
Summary
Phytosulfokine-alpha (PSK-alpha) is a native factor regulating the pollen population effect. This peptide hormone promotes pollen germination and tube growth in a density-dependent manner, clarifying a key molecular mechanism.
Area of Science:
- Plant reproductive biology
- Molecular signaling in plants
- Plant physiology
Background:
- Density-dependent pollen germination and tube growth, known as the pollen population effect, is a documented phenomenon.
- The underlying molecular mechanisms of the pollen population effect remain largely uncharacterized.
Purpose of the Study:
- To identify native bioactive factors contributing to the pollen population effect.
- To investigate the role of phytosulfokine-alpha (PSK-alpha) in regulating pollen germination and tube growth.
Main Methods:
- Incubation of Nicotiana tabacum pollen grains at varying densities in liquid medium.
- Preparation and application of conditioned medium from high-density pollen cultures.
- Inhibition assays using rabbit antiserum against PSK-alpha.
- Quantification of PSK-alpha using enzyme-linked immunosorbent assay (ELISA).
Main Results:
- Pollen germination frequency increased with pollen density.
- Conditioned medium from high-density cultures promoted germination in low-density cultures.
- Anti-PSK-alpha antiserum blocked the promotive effect of conditioned medium.
- Exogenous PSK-alpha stimulated pollen germination at low densities.
Conclusions:
- Phytosulfokine-alpha (PSK-alpha) is a native bioactive factor involved in the pollen population effect.
- PSK-alpha acts as a regulator, promoting pollen germination and tube growth in a density-dependent manner.