Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Incompatibility in Abutilon `Hybridum'

K. K. Pandey
American Journal of Botany
Vol. 47, No. 10 (Dec., 1960), pp. 877-883
Stable URL: http://www.jstor.org/stable/2446586
Page Count: 7
  • Read Online (Free)
  • Download ($12.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Incompatibility in Abutilon `Hybridum'
Preview not available

Abstract

Abutilon `Hybridum' (2n = 16) has a one-locus multiallelic gametophytic (Nicotiana-type) system of self-incompatibility. Five S alleles were distinguished among the 4 plants studied. However, the incompatibility behavior in many crosses is obscured by the modifying effects of a number of other genes non-allelic to the S locus. Since A. `Hybridum' is a cultivar which has arisen through hybridization of 2 or more Abutilon species, it is suggested that the mixed polygenic background of the "species" is not adjusted to the proper functioning of the S gene system. Although most of the plants in the 6 groups studied were highly self-incompatible in the early and mid season, many of them showed pseudo-self-compatibility late in the season. Seed-set in illegitimate crosses also increased late in the season. Colchicine-induced autopolyploidy brought about part or full self-compatibility. After incompatible pollination, pollen germination appeared to be normal but a considerable proportion of the tubes were inhibited in the stigmatic region of the style; tubes which penetrated the style usually burst between 1/5 and 1/3 of the distance from the stigma to the base, a phenomenon not found in any of the other gametophytic-type species yet studied.

Page Thumbnails

  • Thumbnail: Page 
877
    877
  • Thumbnail: Page 
878
    878
  • Thumbnail: Page 
879
    879
  • Thumbnail: Page 
880
    880
  • Thumbnail: Page 
881
    881
  • Thumbnail: Page 
882
    882
  • Thumbnail: Page 
883
    883