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Studies on a triploid, a tetrasomic triploid and a trisomic plant of Dactylis glomerata

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Summary

  1. 1.

    From 4 n×2 n and reciprocal crosses within Dactylis glomerata subsp. lusitanica and D.g. subsp. smithii and between these two subspecies, two triploids, two polyhaploids and a 3n+1 plant were obtained. The two subspecies differ considerably as regards the extent of crossability with respect to intrasubspecific 2n×4n and recriprocal crosses.

  2. 2.

    The cytology of the triploid Dg(1 x sm) 933-III-6 and the 3n+1 plant Dgl 936-I-6 was studied. Chiasma frequency and multivalent frequency per chromosome for these two plants was compared. The frequency distribution for trivalents in the Dg (1 x sm) 933-III-6 plant was compared with the expected binomial distribution. There was a good fit. Data show no evidence for structural differentiation between the two subspecies.

  3. 3.

    In the triploid plant, at anaphase I the distribution of chromosomes did not deviate significantly from a binomial distribution.

  4. 4.

    The triploid and 3n+1 plant had nearly 28% pollen fertility. The 3n+1 plant had significantly higher variance for pollen grain size than the diploid lusitanica plant.

  5. 5.

    From crosses of an asynaptic plant with a normal diploid a primary trisomic plant was obtained. Cytology of the trisomic was studied. In nearly half of the PMCs a trivalent was formed.

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  1. Botany Division, Indian Agricultural Research Institute, New Delhi

    S. S. Shah

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  1. S. S. Shah
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Shah, S.S. Studies on a triploid, a tetrasomic triploid and a trisomic plant of Dactylis glomerata. Chromosoma 15, 469–477 (1964). https://doi.org/10.1007/BF00368142

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  • DOI: https://doi.org/10.1007/BF00368142

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