About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 12 No. 1, p. 105-108
     
    Received: Aug 23, 1971
    Published: Jan, 1972


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2135/cropsci1972.0011183X001200010037x

Cytogenetics of Paspalum urvillei ✕ P. juergensii and P. urvillei × P. vaginatum Hybrids1

  1. Byron L. Burson and
  2. Hugh W. Bennett2

Abstract

Abstract

Paspalum urvillei, 2n = 4x = 40, was crossed with P. vaginatum, 2n = 2x = 20, and P. juergensii, 2n = 2x = 20. A morphologically different type of P. urvillei (480) was also crossed with P. vaginatum. Three P. urvillsiP. vaginatum, five P. urvillei 480 ✕ P. vaginatum and 28 P. urvilleiP. juergensii hybrids were produced. This represents a crossability of 0.7%, 1.3%, and 1.1%, respectively, which is high for this genus. All hybrids were 2n = 3x = 30. Meiosis in P. urvilleiP. vaginatum and P. urvillei 480 ✕ P. vaginatum hybrids was very irregular with numerous laggards and micronuclei. Their mean pairing relationships were 1.89 II, 26.23 I and 1.25 II, 27.50 I respectively. P. urvilleiP. juergensii hybrids had bivalent and univalent chromosome associations at meiosis with some laggards and micronuclei. The mean pairing relationships were 9.89 II and 10.29 I per cell. Chromosome pairing suggests a common genome in P. urvillei and P. juergensii but very little homology between P. urvillei and P. vaginatum. Megasporogenesis was normal in all hybrids. However, the functional megaspore generally deteriorated and an ovule without an embryo sac resulted. Sexual sacs in various stages of development were present in 1% of the ovules observed. None of the hybrids produced seed.

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

Copyright © .