Lodgepole pine (Pinus contorta Douglas ex Louden) is the most widespread pine in North America and the single most abundant tree species in British Columbia (BC). Its vast distribution, diversity and economic value make ...

Megagametophyte development in situ and in vitro was investigated in Douglas fir to address the following questions: (1) Do endogenous levels of plant hormones change during megagametophyte development and are they associated ...

The pollination drop is a conservative pollination mechanism observed in all major gymnosperm taxa. Despite its ubiquity and essentiality to gymnosperm reproductive success, it remains poorly understood. Recent studies ...

Megastigmus spermotrophus is a parasitic chalcid wasp that spends most of its life in the seed of its host, Douglas-fir (Pseudotsuga menziesii). The adult female wasp lays its eggs into the megagametophyte deep within the ...

Most gymnosperms produce a pollination drop that captures and transports pollen into the ovule. Pollination drops have other functions. These include influencing pollen germination and pollen tube growth, defending the ...

Bulbs of camas (Camassia leichtlinii and C. quamash; Liliacaeae) were an important native root vegetable in the economies of Straits Salish peoples. Intensive management not only maintained the ecological productivity of ...

The purpose of this study was to determine if any prezygotic breeding barriers exist in conifers. Prezygotic events were analyzed for both in vivo and in vitro systems in conifers. The events that were monitored included ...

Studies of somatic cell genetics in larches (Larix spp.) were carried out using somatic hybridization, cytogenetics as well as fluorescence in situ hybridization. Haploid embryogenic protoplasts are ideal sources for ...

Douglas-fir develops a megagametophyte regardless of the pollination state of the ovule, whereas many other conifers develop a megagametophye in response to polli- nation. Megagametophytes in unfertilized ovules degrade ...