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Variable expressivity and heritability of multiflorous spikelets in oat panicles

Published online by Cambridge University Press:  05 February 2019

C. M. Zimmer Open the ORCID record for C. M. Zimmer [Opens in a new window] ,
I. P. Ubert ,
M. T. Pacheco  and
L. C. Federizzi
C. M. Zimmer*
Affiliation:
Department of Crop Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Avenue, Porto Alegre, Rio Grande do Sul State, Brazil
I. P. Ubert
Affiliation:
Department of Crop Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Avenue, Porto Alegre, Rio Grande do Sul State, Brazil
M. T. Pacheco
Affiliation:
Department of Crop Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Avenue, Porto Alegre, Rio Grande do Sul State, Brazil
L. C. Federizzi
Affiliation:
Department of Crop Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Avenue, Porto Alegre, Rio Grande do Sul State, Brazil
*
*Email: cmz.zimmer@gmail.com
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Abstract

Multiflorous spikelets are found in oat Avena sativa L. subsp. nudisativa, which is characterised by elongated rachilla and variable number of florets per spikelet. One of the main factors limiting the exploration of multiflorous spikelets in oats, aiming to produce naked grains, is its variable expressivity. This work aimed to detect the environmental influence on the variable expressivity of multiflorous spikelet formation in oats and to estimate the heritability of this trait by analysing its expression in lower, middle and upper third of the panicle in 94 inbred lines of two crosses each. Two populations of recombinant inbred lines were screened for the spikelet formation in 2 years and sowing dates under field experiments. The results demonstrate that the variable expressivity of the multiflorous spikelet formation was highly influenced by the environmental conditions. The variable expressivity varied according to the genetic background, as well as the panicle third where spikelets were produced. The upper third of the panicle showed greater stability for the multiflorous spikelet formation, which is confirmed by the highest heritability coefficients observed in this third, regardless of the assessed population. Our results provide substantial evidences of the contribution exerted by environmental conditions in multiflorous spikelet formation in oats.

Keywords

Naked oatsIndeterminate spikeletsHeritability
Type
Research Article
Information
Experimental Agriculture , Volume 55 , Issue 6 , December 2019 , pp. 829 - 842
Copyright
© Cambridge University Press 2019 

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