CYTOGENETIC STUDIES OF MEIOTIC ABNORMALITIES INCOLLINSIA TINCTORIA. I. CHROMOSOMAL STICKINESS

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Abstract
Certain plants of Collinsia tinctoria showing chromosomal stickiness at metaphase I and other stages of microsporogenesis were isolated among second generation progeny of an irradiated plant. Genetic analysis of the F1and F2progenies from crosses involving such plants showed that this meiotic abnormality can be attributed to a single recessive gene. Besides excessive clumping of chromosomes, this mutant also caused other meiotic abnormalities. These were: increased heteropycnosis at pachytene, high chromosomal fragmentation at prophase I, distortion of normal location and orientation of chromosomes at metaphase I, arrested chromosomal movement and abnormal cytokinesis. All these abnormalities resulted in a high degree of male sterility. Possible mechanisms causing the stickiness of chromosomes during meiosis and consequent abnormalities are discussed.