Manipulation of the host genotype has been proposed as a method of increasing biological nitrogen fixation by rhizobia in symbiosis with the peanut (Arachis hypogaea L.). The F1 generation of a diallel cross of 10 South American cultivars was evaluated in the greenhouse in an analysis of gene action for traits related to nitrogen fixation. The parents represented five secondary centers of diversity and effects in the diallel model were partitioned into among- and within-center components. Variation of center effects was significant for several characters but was smaller in magnitude than within-center variation. Specific combining abilities were significant and accounted for more variability than general combining abilities for nodule number, nodule mass, specific nitrogenase activity, shoot weight, and total nitrogen, indicating non-additive types of gene action. Maternal effects were observed for the same characters. The parents with the highest general combining abilities (GCA's) for nitrogen fixation were both fastigiate types, while Virginia-type parents had generally low GCA's. Correlations between parental and GCA effects were nonsignificant for all traits, so simple evaluation of lines for nitrogen-fixing capacity may not identify superior parents for use in breeding programs.
Available as PDF only - Use Download Feature
Keywords: diallel cross, nitrogenase activity, nodulation, cytoplasmic effects
How to Cite:
Isleib, T. & Wynne, J. & Elkan, G. & Schneeweis, T.,
(1980) “Quantitative Genetic Aspects of Nitrogen Fixation in Peanuts (Arachis hypogaea L.)1,2”,
Peanut Science 7(2),
30 Jun 1980
1Paper No. 6020 of the Journal Series of the North Carolina Agricultural Research Service. This investigation was supported in part by grant USDA-SEA-CR 616-15-192 and 701-15-24 under A.I.D. PASA AG/TAG 610-0-76.
2The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of the products named nor criticism of similar ones not mentioned.