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Outcrossing Rates of Experimental Populations of Cuphea lanceolate
Author(s) -
Knapp S. J.,
Tagliani L. A.,
Liu B.H.
Publication year - 1991
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1991.tb00519.x
Subject(s) - outcrossing , selfing , biology , pollinator , open pollination , pollination , mating system , botany , agronomy , mating , pollen , population , ecology , demography , sociology
Outcrossing rates of Cuphea lanceolata Ait., a new Dilseed crop, have not been estimated; however, this species is known to be insect‐pollinated, self‐compatible, and autosterile. We used five allozyme loci and the mixed mating model to estimate the outcrossing rates of experimental populations of Cuphea lanceolata Ait. grown at Corvallis, Oregon in 1987 and 1988. Populations were grown using densities of one and 27 plants m −2 . Multilocus out‐crossing rate estimates of populations grown at low and high density ranged from 0.61 to 0.85 and 0.93 to 0.94, respectively. Density caused differences may be caused by differences in pollinator movement. In open plantings, e.g., space‐plant nurseries, selfing rates are increased by increased within plant pollination by bumblebees, the primary pollinators of C. lanceolata in temperate zones. The movement of pollinators between plants is enforced in dense plantings. We found C. lanceolata is predominantly al‐logamous, but selfing rates as great as 39.0 % were observed among space‐plants; thus, the progeny of an open‐pollinated individual plant grown in this type of nursery is a mixed half‐sib and S 1 family. Maximum outcrossing can be achieved by using dense plantings.