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Cytogenetical studies on autotriploid (2n×4n)olitorius jute (Corchorus olitorius Linn. strain chinsurah green)

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Summary

  1. 1.

    Height, base diameter, the number of branches, the number of pods, size of ultimate fibres, leaf measurements, pod measurements, measurements of guard cells, number of full seeds per pod in case of autotriploid jute were noted and compared with diploid and autotetraploid jute.

  2. 2.

    Mean numbers of chromosome associations per p.m.c in 3 n jute show 2.48 univalents, 4.64 bivalents, 0.58 trivalents, 1.80 quadrivalents, 0.064 hexavalents and 0.064 fragments. Quadrivalents are noticed in the forms of ring and chain. Y-shaped trivalent is common. Chromosome numbers varied.

  3. 3.

    Laggards, occasional bridges due to stickiness, irregular segregation, late dividing bivalents etc. are noted. Elimination of chromatin bodies is observed.

  4. 4.

    Monads to octads with or without micronuclei are recorded.

  5. 5.

    Fertility percentage in 3 n (63.5%) is compared with 2 n and 4 n. Pollen diameters of 3 n is also compared with those of 2 n and 4 n.

Zusammenfassung

  1. 1.

    An Autotriploiden einer Juteart (Corchorus olitorius Linn., Linie Chinsurah Green) wurden die Merkmale Pflanzenhöhe, Basisdurchmesser, Verzweigung, Anzahl der Kapseln, Länge der letzten Faser, Blttumfang, Umfang der Kapseln Ausmaß der Stomata und Zahl der Samen je Kapsel untersucht und mit denen der diploiden und autotetraploiden Typen verglichen.

  2. 2.

    Durchschnittlich wurden folgende Chromosomenkonfigurationen in den Pollenmutterzellen der Autotriploiden gefunden: 2,48 Univalente, 4,64 Bivalente, 0.58 Trivalente, 1,80 Quadrivalente, 0.064 Hexavalente und 0.064 Fragmente. Die Quadrivalente zeigten meist Ring- oder Kettenform. Y-förmige Trivalente traten häufig auf. Die Chromosomenzahl variierte.

  3. 3.

    Außerdem wurden “laggards” als Folge gelegentlicher Bildung von Verklebungsbrücken, unregelmäßiger Verteilung der Chromosomen und später Trennung von Bivalenten usw. festgestellt, ebenso eine Elimination von Chromatinkörperchen.

  4. 4.

    Nach Abschluß der Meiose traten Monaden bis Oktaden mit und ohne Mikronuclei auf.

  5. 5.

    Schließlich wurde die Fertilität (63.5%) und der Pollendurchmesser der 3 n- mit den 2 n- und 4 n-Formen verglichen.

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Datta, R.M. Cytogenetical studies on autotriploid (2n×4n)olitorius jute (Corchorus olitorius Linn. strain chinsurah green). Der Züchter 34, 335–340 (1965). https://doi.org/10.1007/BF00706681

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