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... more 10.000 glossed keywords and links to more than 100 figures and schemes, about 100 tables etc. can be obtained in addition to this limited INTERNET version or in modified design as book by CRC Press, Taylor & Francis Group, Boca Raton, USA

Q banding: a chromosomal staining technique using the fluorescence dye quinacrin mustard; under UV light a characteristic light and dark banding is induced cyto meth

QTL >>> quantitative trait locus

quadriduplex type >>> autotetraploid >>> nulliplex type

quadrivalent: a chromosome association of four members cyto >>> Figure 15

quadruplex type >>> autotetraploid

qualitative character: a character in which variation is discontinuous gene >>> Table 33

qualitative inheritance: an inheritance of a character that differs markedly in its expression amongst individuals of a species; variation is discontinuous; such characters are usually under the control of major genes gene >>> Table 33

qualitative resistance >>> vertical resistance

quality-declared seed: a terminology introduced by the FAO, for a seed system in which a proposed 10 % of the seed produced and distributed is checked by an autonomous seed control agency and the rest by the seed-producing organization seed

quantitative character: a character in which variation is continuous so that classification into discrete categories is arbitrary gene >>> metric character >>> Table 33

quantitative genetics: a branch of genetics that deals with the inheritance of quantitative traits; sometimes it is also called biometrical or statistical genetics gene

quantitative inheritance: an inheritance of a character that depends upon the cumulative action of many genes, each of which produces only a small effect; the character shows continuous variation (i.e., a gradation from one extreme to the other) gene >>> Table 33

quantitative resistance >>> horizontal resistance

quantitative trait locus (QTL): a locus or DNA segment that carries more genes coding for an agronomic or other traits gene >>> Table 33

quantitative vertical resistance: a rare type of resistance; it occurs cereals, e.g., Hessian fly resistance (Mayetiola destructor) in wheat or rice blast; it is a confusing term because its inheritance is qualitative while its effects are quantitative; it can easily be confused with horizontal resistance, and the best way to avoid it in a breeding program is by choosing only parents that exhibit the normal, qualitative, vertical resistance phyt >>> quantitative resistance >>> horizontal resistance

quantum speciation: the rapid rise of a new species, usually in small isolates, with the “founder effect” and random genetic drift; it is also called saltational speciation tax evol

quarantine: the official confinement of plants subject to phytosanitary regulations for observation and research or for further inspection and/or testing; more general, a legal ban on the export or import of certain noxious weeds or insects that may be attached to the plants meth seed agr

quarternary hybrid: a hybrid derived from four different grandparental individuals meth

quartet: the four nuclei and/or cells produced during meiosis bot >>> tetrad

quasi-complete Latin square - quasivollständiges lateinische Quadrat n: a Latin square because every entry appears once in each row and once in each column; it is quasi-complete because every entry is a horizontal neighbor to every other entry exactly twice, and every entry is a vertical neighbor to every other letter exactly twice stat >>> Figure 90

quelling: post-transcriptional gene silencing in Neurospora crassa induced by the introduction of a transgene biot >>> PTGS

quereitron >>> glucoside

quick test (of seed testing): a type of test for evaluating seed quality, usually germination, more rapidly than standard laboratory tests seed

quiescence >>> dormancy

quincuncial: of the arrangement of corolla lobes in a bud; a variant of imbricate aestivation bot

quincunx planting: planting four young plants to form the corners of a square with a fifth plant at its center meth

quinone >>> growth inhibitor

© by R. Schlegel 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019