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Genetic variation for wheat spike fertility in cultivars and early breeding materials

Published online by Cambridge University Press:  08 January 2015

N. E. MIRABELLA ,
P. E. ABBATE ,
I. A. RAMIREZ  and
A. C. PONTAROLI
N. E. MIRABELLA
Affiliation:
Unidad Integrada Balcarce (Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata and Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria), CC 276 (7620) Balcarce, Buenos Aires, Argentina Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Balcarce, Argentina
P. E. ABBATE
Affiliation:
Unidad Integrada Balcarce (Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata and Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria), CC 276 (7620) Balcarce, Buenos Aires, Argentina
I. A. RAMIREZ
Affiliation:
Unidad Integrada Balcarce (Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata and Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria), CC 276 (7620) Balcarce, Buenos Aires, Argentina Monsanto's Beachell-Borlaug International Scholarship Program, Balcarce, Argentina
A. C. PONTAROLI*
Affiliation:
Unidad Integrada Balcarce (Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata and Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria), CC 276 (7620) Balcarce, Buenos Aires, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, Balcarce, Argentina
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Grain yield in bread wheat is often tightly associated with grain number/m2. In turn, spike fertility (SF), i.e., the quotient between grain number and spike chaff dry weight, accounts for a great proportion of the variation in grain number among cultivars. In order to examine the potential use of SF as a breeding target, (1) variation for the trait was assessed in six datasets combining commercial cultivars under different environmental conditions, (2) trait heritability was estimated in a set of F1 hybrids derived from controlled crosses between cultivars with contrasting SF and (3) SF distribution pattern was analysed in two F2 segregating populations. Analysis of commercial cultivars revealed considerable variation for SF, under both optimal and sub-optimal conditions. In addition, genotypic variation was consistently larger than genotype × environment interaction variation in all datasets. Narrow sense heritability, estimated by the mid-parent-offspring regression of 20 F1 hybrids and their respective parents, was 0·63. Data from two F2 populations exhibited bell-shaped and symmetric frequency distributions of SF, with a SF mean intermediate between the parental values. Substantial transgressive segregation was detected in both F2 populations. In conclusion, SF appears to be a heritable trait with predominantly additive effects. This warrants further investigation on the feasibility of using SF as an early selection criterion in wheat breeding programs aimed at increasing grain yield.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 154 , Issue 1 , January 2016 , pp. 13 - 22
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Copyright
Copyright © Cambridge University Press 2015 

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