My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in CS

  1. Vol. 28 No. 3, p. 561-563
     
    Received: Nov 10, 1986
    Published: May, 1988


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2135/cropsci1988.0011183X002800030028x

Heterosis and Isozyme Divergence in Indica Rice

  1. J. Y. Peng,
  2. J. C. Glaszmann and
  3. S. S. Virmani 
  1. D ep. of Botany and Plant Pathology, Purdue Univ., West Lafayette, IN 47907
    C IRAD, IRAT, Nogent-Sur-Marne, France
    I nt. Rice Res. Inst. (IRRI), Los Baños, Laguna, Philippines

Abstract

Abstract

Earlier studies conducted in China indicated an association of heterosis in rice (Oryza sativa L.) crosses with certain esterase and peroxidase isozyme patterns. To search for methods that predict yield heterosis in hybrid rice breeding program at IRRI, we studied isozyme variation of 18 rice cultivars (seven maintainers and 11 restorers of ‘WA’ cytosterility system) and 75 F1, hybrids derived from these parents to determine the relationship between yield heterosis in the F1s and isozyme diversity among their parents. Isozyme variation among parental lines was found for six genes, viz., Est-9, Est-2, Amp-3, Sdh-1, Pgi-2, and Pgd-1. Midparent heterosis for yield ranged from −44.6 to 156.7%. Our studies did not show any association between magnitude of heterosis in F1s and isozyme variation among parents. The reason our results differed from those reported in China may be because most of the parental lines used in our studies were elite rice cultivars bred at IRRI from complex crosses involving parents of various geographic origin that allowed extensive recombination among genes. Consequently, linkage disequilibrium between isozyme markers and gene blocks involved in heterosis for yield might have disappeared.

Contribution from IRRI.

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

Copyright © .