Plant Biology: Learning to Love Yourself.

Area of Science:

• Plant reproductive biology
• Molecular genetics
• Evolutionary biology

Background:

• Self-incompatibility mechanisms prevent self-fertilization in many plant species.
• The role of female reproductive tissues in pollen selection within self-compatible species remains largely unexplored.
• Understanding pollen-pistil interactions is crucial for plant breeding and understanding reproductive isolation.

Purpose of the Study:

• To investigate the potential for pollen genotype selection by the pistil in self-compatible species.
• To identify the molecular mechanisms underlying style-mediated pollen bias in coyote tobacco (Nicotiana attenuata).
• To explore parallels between plant cryptic female choice and animal cryptic female choice.

Main Methods:

• Comparative analysis of gene expression patterns in coyote tobacco styles.
• Controlled pollination experiments with different pollen genotypes.
• Molecular techniques to identify key genes involved in pollen recognition and rejection.

Main Results:

• The study identified specific gene expression patterns within the style that correlate with pollen genotype.
• Evidence suggests that the style actively biases fertilization success towards certain pollen types.
• These mechanisms are analogous to cryptic female choice observed in animal reproductive systems.

Conclusions:

• The female style in self-compatible coyote tobacco exerts selective pressure on pollen.
• Gene expression matching in the style is a key molecular basis for this cryptic female choice.
• This finding challenges the assumption that self-compatibility eliminates female control over fertilization.