Abstract

Autoimmunity: A Barrier to Gene Flow in Plants?

Highlights

  • 150 years after Darwin published The Origin of Species, evolutionary biologists are still working out the conditions and processes that give rise to new species

  • Hybrid necrosis occurs in crosses within and between species, suggesting that similar evolutionary processes may be at work at different times as the genes of the interbreeding species drift apart

  • Conditions like hybrid necrosis, according to the classic Dobzhansky-Muller model of hybrid incompatibility, arise from deleterious interactions between genes inherited from the parents

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Summary

Introduction

150 years after Darwin published The Origin of Species, evolutionary biologists are still working out the conditions and processes that give rise to new species. One postfertilization mechanism in plants, called hybrid necrosis, arises from interactions between genes that cause misshapen, yellow, or damaged leaves and stunted growth, much like an infection. Conditions like hybrid necrosis, according to the classic Dobzhansky-Muller model of hybrid incompatibility, arise from deleterious interactions between genes inherited from the parents.

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