How parental factors shape the plant embryo.

Area of Science:

• Plant developmental biology
• Epigenetics
• Evolutionary genetics

Background:

• Primary axis formation is crucial for embryonic patterning in flowering plants.
• Parent-of-origin effects, where gene inheritance from mother or father matters, are increasingly recognized in this process.
• These effects are linked to nutrient allocation strategies, potentially driven by parental conflict.

Purpose of the Study:

• To review molecular pathways controlling apical-basal patterning in early plant embryos.
• To discuss the role of parent-of-origin effects in embryonic development.
• To examine these findings within the framework of the parental conflict theory and other evolutionary explanations.

Main Methods:

• Literature review of recent findings on plant embryogenesis and parent-of-origin effects.
• Analysis of molecular pathways involved in apical-basal patterning.
• Discussion of genetic and epigenetic mechanisms, including imprinting.

Main Results:

• Parent-of-origin effects significantly influence early embryonic patterning and development.
• Apical-basal patterning impacts suspensor development and nutrient transport.
• Imprinting is a key mechanism for maternal control of endosperm development.

Conclusions:

• Parent-of-origin effects are critical for early plant embryo development, mediated by gamete-derived factors.
• The parental conflict theory provides a framework for understanding nutrient allocation but alternative explanations also exist.
• Further research is needed to fully elucidate the evolutionary forces shaping these phenomena.