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NOTE ON THE CYTOLOGY OF AN F 1 HYBRID BETWEEN SILENE DICLINIS (LAG.) M. LAINZ AND S. HEUFFELII SÓO
Author(s) -
MORISSET PIERRE,
BOZMAN GABRIELLE V.
Publication year - 1969
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1969.tb06519.x
Subject(s) - meiosis , anaphase , pollen , chromosomal translocation , biology , homologous chromosome , mother cells , genetics , chromosome , bivalent (engine) , botany , chemistry , gene , organic chemistry , metal
S ummary This paper describes the meiotic cytology of an artificial F 1 hybrid (2 n = 24) between Silene diclinis (Lag.) M. Lainz (2 n = 24) from Spain and S. heuffelii Sóo ( 2n = 24) from Rumania. The hybrid was intermediate between the two parents in most of its morphological characters. It had a pollen fertility of 31%. At meiosis, it formed bivalents except for an association of three or four chromosomes which revealed the presence of an heterozygous reciprocal translocation. The extent of pairing showed that the chromosomes of S. diclinis are homologous with those of S. heuffelii . Anaphase bridges occurred at both meiotic divisions; this phenomenon is discussed and interpreted as the result of spontaneous chromosome breakage. This breakage is tentatively explained as a consequence of minute structural differences between paired chromosomes. It is suggested that spontaneous chromosome breakage at meiosis may be a common but overlooked effect of diclinis in plants.