Jeff Groh

@jeffgroh.bsky.social

483 Followers 252 Following

Miller Postdoctoral Fellow at UC Berkeley. Evolutionary genetics and genomics. Interested in plant mating systems, speciation and hybridization.

Time-lapse video of 'Hass' avocado flowers opening and closing. CC-BY-NC Jeff Groh
Time-lapse video of avocado flowers opening and closing. CC BY-NC Jeff Groh
Similar haplotype structure for heterodichogamy in both Pterocarya and Cyclocarya, and gene expression patterns of GFAFL in Cyclocarya flowers
Pictures of two dichogamy morphs in Pterocarya trees, a graph visualizing flower dimorphism, and a phylogeny of the Juglandaceae family showing divergence times and origins of genetic systems for heterodichogamy.
Pollination in walnuts (such as this Persian walnut, Juglans regia) and pecans occurs through a genetically controlled temporal flowering dimorphism. Two distinct morphs alternate their phases of male and female flowering across the season, promoting outcrossing that has maintained a stable equilibrium throughout tens of millions of years of evolution. See eado5578. Photo: Philippe Clement/NPL/Minden Pictures