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Uniculm and conventional tillering barley accessions under northern growing conditions

Published online by Cambridge University Press:  18 July 2011

P. MÄKELÄ  and
S. MUURINEN
P. MÄKELÄ*
Affiliation:
Department of Agricultural Sciences, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland
S. MUURINEN
Affiliation:
Department of Agricultural Sciences, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland
*
*To whom all correspondence should be addressed. Email: pirjo.makela@helsinki.fi
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Summary

At high northern latitudes, growing seasons are short with long days. In these conditions, tillering is an unwanted trait in barley (Hordeum vulgare L.), because the grains on tillers develop later than those on the main stem and are often harvested before they are fully mature, leading to reductions in overall quality. Hence, the uniculm growth habit has been considered an interesting option for boreal barley production. The aim of the present study was to determine the differences in the yield formation of conventional tillering and uniculm barley, using two pairs of near-isogenic lines and two controls. Uniculm and conventional tillering barley were grown in three experiments conducted at Suitia Experimental Farm, University Helsinki, Finland during 1999–2001. Samples were collected frequently to monitor the biomass and leaf area accumulation. Water-soluble carbohydrate content was analysed at anthesis and at maturity in different plant parts. At maturity, the numbers of spikes/plant and grains/spike were calculated and grain yield weighed. The grain yield of the uniculm barleys was stable over these growing seasons, but it was only half that of the conventional barley cultivars due to the absence of spike-bearing tillers, lower spike grain number and spike weight. In addition, the ability to transport photosynthesized carbohydrates to grains may have been reduced. Thus, it seems that uniculm barleys do not provide further improvement in barley yield.

Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 150 , Issue 3 , June 2012 , pp. 335 - 344
Copyright
Copyright © Cambridge University Press 2011

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