heterostyly

(redirected from thrum)
Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia, Wikipedia.

heterostyly

a combination of the morphological and physiological mechanisms that promote cross-pollination in flowering plants. Structurally, there are usually two flower forms (e.g. the ‘pin’ and ‘thrum’ forms of the primrose) which ensure that the pollen collected from the stamens of one type is deposited on the stigma of the other (see ENTOMOPHILY). There is also SELF-INCOMPATIBILITY between pollen and stigma from the same flower type, although there is compatibility between flowers of different types. Compare HOMOSTYLY.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
Mentioned in ?
References in periodicals archive ?
The deal is seen to wrap up later this year.Country: CanadaSector: Business and Consumer ServicesTarget: Thrum Energy Inc Buyer: Aker Solutions ASAType: Corporate acquisitionStatus: Agreed
The genetic model represents the thrum genotype as Ss and ss for pin flowers.
Radio/Guitar, Thrum (Table of the Elements) Visual artists/musicians Peggy Ahwesh and Barbara Ess's throbbing vinyl composition.
So Burr Lawrence Rising + Bates Architects, which serves the Pacific Northwest and had worked with the district before, facilitated a community thrum to explore the options.
And in a man with a microphone, Joseph saw a thrum.
This annual gathering of TAPPI Members, Fellows, leaders, and honored guests provides a thrum for sharing information and recognizing those who have made unique contributions to TAPPI and to the industry.
In the past 20 years, researchers interpreting the messages that thrum in substrates have revealed a sort of ant-ernet, zinging with communiques about lost relatives, great food, free rides for hitchhikers, caterpillars in search of ant partners, and impending doom.
"The problem has been that we are still waiting for the sale of Thrum Hall and we have had to contribute towards the cost of two new stands at the Shay."
The flowers of distylous species are often tubular, and placement of stigmas and anthers in the two morphs is reciprocal, such that the stigmas of long-styled plants, or "pins," and the anthers of short-styled plants, or "thrums," are held near the top of the corolla tube, whereas thrum stigmas and pin anthers are positioned midway down the corolla tube.
"It gave him a thrum of pleasure that Bitsey was anxious," Buckley's narrator writes.
A male ruffed grouse hops up on a hollow deadfall and sends out his drumroll call for a mate, his wings a butterfly blur as they thrum against the log.
When I got an 850cc mini in 1965, I had a straight-through exhaust fitted to make it go thrum thrum, even though it didn't improve the performance, so that people might think I had a Cooper S in disguise.