bla gene: beta-lactamase gene conferring resistance to ampicillin; commonly used as selective marker for plasmid vectors biot black leg (of beets): a number of diseases (e.g., caused by Pythium debaryanum) in which symptoms include blackening of the base of the stem, often followed by the collapse of the stem phyt black leg (of potato): a bacterial disease (Erwinia carotovora ssp. atroseptica) causing severe yield loss, particularly in wet conditions phyt blade: the expanded portion of a leaf, petal, or sepal bot >>> Table 30
blade joint: the flexible union between the leaf blade and the leaf sheath bot blanch: a method to whiten or prevent from becoming green by excluding light; blanching is applied to the stems or leaves of plants (e.g., celery, lettuce, and endive); it is done either by banking up the soil around the stems, tying the leaves together to keep the inner ones from light, or covering with pots, boxes, etc. meth hort blasting: a plant symptom characterized by shedding of unopened buds; leads to a failure of producing fruits or seeds phyt agr bleeding: exudation of the contents of the xylem stream at a cut surface due to root pressure bot blend: a term applied to mechanical seed mixtures of different crop varieties or species that have been mixed together to fulfill a specific agronomic purpose seed blended variety >>> multiline variety >>> blend blending >>> blend blending inheritance: inheritance in which the characters of the parents appear to blend into an intermediate level in the offspring with no apparent segregation in later generations gene blight: a disease characterized by rapid and extensive death of plant foliage, and applied to a wide range of unrelated plant diseases caused by fungi, when leaf damage is sudden and serious (e.g., fire blight of fruit trees, halo blight of beans, potato blight, etc.) phyt blind: without flowers; sterile bot
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