• L. E. Morris

      Articles written in Journal of Genetics

    • Pollen germination inBrassica chinensis × Raphanus sativus F1 hybrids

      L. E. Morris

      More Details Abstract Fulltext PDF

      Diploid pollen, with 19 chromosomes, from theF1 hybrid plants (2n = 19) ofB. chinensis × R. sativus usually failed to grow on theF1 stigmas. It was, however, fully capable of germination on the stigmas of swede (2n = 36) and of some other crosses. Also pollen of radish,B. chinensis, and swede was able to grow on theF1 stigmas.

      The sterility of theF1 plants is attributed to the alteration of the chromosome balance between pollen and style from the usual 1n : 2n to 2n : 2n.

    • A triploid radish × turnip hybrid and some of its progeny

      L. E. Morris R. H. Richharia

      More Details Abstract Fulltext PDF

      Pollinating radish (n = 9) by turnip (n = 10) gave, amongst other plants, a triploid hybrid with 2n = 28; probably from a diploid radish egg-cell.

      By open pollination the triploid hybrid gave a varied progeny including two hexaploid plants with 2n = 56. These resembled the triploid in appearance, and were almost sterile.

      In open pollination the functional egg-cells were chiefly triploid, but some had 9 chromosomes, and were genetically similar to those of radish.

      The pollen of the triploid, like the egg-cells, showed a wide range from 9 chromosomes probably up to triploid. Used on radish, however, it was chiefly that with 9 chromosomes, similar to those of radish, that gave progeny, though some 10 chromosome pollen also was functional. Thus, apparently, triploid pollen was functional on the triploid but not on radish, probably owing to the chromosome ratio between pollen and stigma.

      From the back-cross to radish a plant with a single extra turnip chromosome appeared to be identical with radish except for its reduced fertility.

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