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Somatic Chromosomal Irregularities in Nicotiana plumbaginifolia Viv. 1
Author(s) -
Collins G. B.
Publication year - 1968
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1968.0011183x000800010027x
Subject(s) - biology , somatic cell , metaphase , nicotiana tabacum , genetics , chromosome , botany , gene
Nicotiana tabacum L. ✕ N. plumbaginifolia Viv. hybrids are characterized by somatic chromosomal irregularities involving chromosomes contributed by N. plumbaginifolia . Chromosomal irregularities were observed in smear preparations of root tips and corollas of N. plumbaginifolia ; none were observed in similar tissue from N. tabacum . Irregularities in seedling root tips included; micronuclei, extra and missing chromosomes at metaphase, fragments, anaphase bridges, laggards, and extra long metaphase chromosomes suggestive of dicentrics. Two and four year old seeds produced a much higher frequency of these irregularities than seed that was 2‐3 months of age. Only corolla tissue from fresh seed was examined and aberrations were seldom observed. Chromsomal irregularities, detected in tissue of N. plumbaginifolia , may be associated with a seedling stress period marked by retarded growth and chromosome irregularities in a tabacum‐plumbaginifolia hybrid. In N. plumbaginifolia , the aberrations appear to be associated with aged seed whereas aberrancy in the tabacumplumbaginifolia hybrid may be partly a function of interspecific hybridity.