diaspore

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diaspore

(dī′ə-spôr′)
n.
1. A white, pearly hydrous aluminum oxide, AlO(OH), found in bauxite, corundum, and dolomite and used as a refractory and abrasive.
2. Botany See disseminule.
References in periodicals archive ?
Pequi diaspores with moisture content 63.67 (% d.b.) were subjected to drying in a forced-air oven at 75 [degrees]C until reaching moisture contents of 16.6, 13.1, 8.7 and 6.4 (% d.b.), determined in an oven at 105 [+ or -] 1 [degrees]C, during 24 h, in two replicates (Brasil, 2009).
The diaspores of target species were sown in 9 cm Petri dishes, with two filter papers moistened with 5 mL aqueous leaf extract, oxyfluorfen herbicide (positive control) or distilled water (negative control).
Fruit ripening has also been associated with the appropriate dispersal season; for instance, diaspores of wind dispersal species ripen during the dry season (Lieberman, 1982; Morellato et al., 1990; Ibarra-Manriquez et al, 1991; Batalha and Martins, 2004), a situation that also occurs in several species of Asteraceae in the study area.
From an ecological viewpoint, the dispersal of diaspores is a process of great importance for plant species because it enables them to expand their area of occurrence, decreases intraspecies competition and allows increase of their genetic variability into the population (HOWE; MIRITI, 2004).
In general, temperature and substrate are analyzed jointly, and the best germination results for these species are obtained when seeds or diaspores are placed in a porous substrate, such as sand or vermiculite, at constant temperature of 25 to 30[degrees]C (IOSSI et al., 2003; PIVETTA et al., 2005, 2008; SILVA e SILVA et al., 2006).
Morphological patterns of diaspores from animal-dispersed tree and treelet species at Parque Estadual de Itapua, Rio Grande do Sul State, Brazil.
Grime (1979) reports that woodland shrubs have either an escape mechanism (i.e., diaspores that are widely dispersed to exploit spatially irregular patches where seedlings could become established) or a "bank of persistent seedlings." In contrast, Eriksson (1989) presents evidence that shrubs depend on seasonal regeneration or on a persistent seed bank.
The reproductive traits used are: 1--high and continuous seed production, 2--breeding system that promotes self-pollination and low expression of deleterious characters, 3--floral morphology allowing a large diversity of visitors, 4--a generalist biotic pollination system or wind pollination, and 5--abiotic dispersal syndrome of diaspores and/or capacity for colonization and eventual immigration.