About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 8 No. 6, p. 713-716
     
    Received: May 22, 1968


 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2135/cropsci1968.0011183X000800060021x

Karyotype of a David Medicago sativa L. Analyzed from Sporophytic and Gametophytic Mitoses1

  1. G. R. Buss and
  2. R. W. Cleveland2

Abstract

Abstract

Idiograms were constructed for the mitotic chromosomes of diploid Medicago sativa L. (2n = 16). Chromosomes were measured in root tip cells and generative nuclei of pollen tubes. Statistical methods applied to the data did not provide a means for identifying homologous chromosomes; however, a pattern of morphology was found by which chromosomes could be matched by inspection. The haploid complement of eight chromosomes was divided into two groups, four long and four short chromosomes. Within each group the arm length ratios (short arm length ÷ long arm length) increased as total lengths decreased. Only minor discrepancies for this pattern existed. In root-tips the chromosomes ranged from 3.5 to 4.5 microns in length, and ratios ranged from 0.53 to 0.94. The chromosomes were shorter in pollen tubes (lengths: 2.4-3.1 microns; ratios: 0.64-0.95). Idiograms from the two sources agreed in essential form except that the satellited chromosome was not recognizable in pollen-tube nuclei.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .