J. R. Pannell

A model for the gradual evolution of dioecy and heterogametic sex determination

This paper models how dioecy with heterogametic sex determination can evolve gradually through co-evolution of resource allocation and genetic architecture, favoring XY systems under certain ecological and genetic conditions.

Size-dependent sex allocation and the expression of andromonoecy in a protogynous perennial herb: both size and timing matter

The study examines size-dependent sex allocation and andromonoecy in Pulsatilla alpina, finding that small plants produce only male flowers, while both small and larger plants allocate to male functions early in the flowering season when mating opportunities are high.

Disruptive selection via pollinators and seed predators on the height of flowers in a wind-dispersed alpine herb

The paper examines how pollinators and seed predators influence selection on floral stalk height in Pulsatilla alpina, finding disruptive selection and positive effects on reproductive success.

Disentangling the effects of jasmonate and tissue loss on the sex allocation of an annual plant

This study investigates how herbivory and jasmonate signaling affect sex allocation in Mercurialis annua, finding that tissue loss reduces male reproductive effort while jasmonate reverses this effect.

Enhanced leaky sex expression is an adaptive plastic response to pollen limitation in the dioecious plant Mercurialis annua

This study shows that leaky sex expression in Mercurialis annua increases under pollen limitation, indicating an adaptive plastic response to mating context.

YY males of the dioecious plant Mercurialis annua are fully viable but produce largely infertile pollen

The study compares viability and fertility between XY and YY males in Mercurialis annua, finding YY males produce largely infertile pollen despite similar viability.

Low Rate of Somatic Mutations in a Long-Lived Oak Tree

The paper sequenced two branches of a 234-year-old oak tree and found few somatic mutations, suggesting shoot meristems are mutation-resistant.