Bulbous plant bulbous

bulk breeding: the growing of genetically diverse populations of self-pollinated crops in a bulk plot with or without mass selection, generally followed by a single-plant selection; it is a procedure for inbreeding a segregating population until the desired level of homozygosity is achieved; the seeds to grow each generation is a sample of that harvested from plants of the previous generation; it is usually used for the development of self-pollinated crops; it is an easy way to maintain populations during inbreeding; natural selection is permitted to occur, which can increase the frequency of desired genotypes compared with an unselected population; it can be used in association with mass selection with self-pollination; disadvantages are: (a) plants of one generation are not all represented by progeny in the next generation, (b) genotypic frequencies and genetic variability cannot be clearly defined, and (c) natural selection may favor undesirable genotypes meth >>> Figure 16 >>> Table 24

bulk population selection: selection procedure in self-pollinating crops; segregating populations are propagated as bulks until segregation is virtually ceased, at which time selection is initiated meth >>> Figure 16 >>> Table 24 >>> bulk breeding bulked segregant analysis (BSA): a rapid mapping strategy suitable for monogenic qualitative traits; when DNA of a certain number of plants is bulked into one pool, all alleles must be present; two bulked pools of segregants, differing for one trait, will differ only at the locus harboring that trait biot bullet planting: setting out young trees grown in bullet-shaped rigid plastic tubes, which are injected into the ground by a spring-loaded gun, sometimes into prepared holes fore hort bumblebee: any of several large, hairy social bees of the family Apidae, sometimes utilized for pollination of special crop plants; frequently bumblebees are used for successful seed multiplication of legume and Brassica crops in greenhouses, especially of genebanks zoo seed bumper mill: a machine designed to clean timothy seed by a continuous bumping action on an inclined plane; the uncleaned seed is metered onto the plane, which is continuously bumped by sets of knockers; the cylindrical timothy seeds are rolled into separate grooves while non-cylindrical contaminants are jarred off the end of the inclined plane and separated seed bundle sheath: a layer of cells enclosing a vascular bundle in a leaf bot

BUNSEN burner: a hot-flame burner using a mixture of gas and air ignited at the top of a metal tube; this device is used for sterilizing tools and container openings during aseptic transfer in vitro experiments; after R. W. BUNSEN (1811-1899) prep bunt: stinking smut; a seed-borne disease of grasses caused by Tilletia spp.; the grain is replaced by masses of fungal spores that have a characteristic fishy smell phyt bur: the rough, prickly covering of the seeds of certain plants (e.g., chestnut) bot burlap: a loosely woven fabric made of jute or hemp; used to protect newly seeded lawns from wind, water, and birds meth agr hort

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