Journal article
Genetic analysis of potassium use efficiency in Brassica oleracea
Annals of Botany, Vol.105(7), pp.1199-1210
2010
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Abstract
<p><h3>Background and Aims</h3> <p id="x-x-x-__p1">Potassium (K) fertilizers are used in intensive and extensive agricultural systems to maximize production. However, there are both financial and environmental costs to K-fertilization. It is therefore important to optimize the efficiency with which K-fertilizers are used. Cultivating crops that acquire and/or utilize K more effectively can reduce the use of K-fertilizers. The aim of the present study was to determine the genetic factors affecting K utilization efficiency (KUtE), defined as the reciprocal of shoot K concentration (1/[K]<sub>shoot</sub>), and K acquisition efficiency (KUpE), defined as shoot K content, in <em>Brassica oleracea</em>. <h3>Methods</h3> <p id="x-x-x-__p2">Genetic variation in [K]<sub>shoot</sub> was estimated using a structured diversity foundation set (DFS) of 376 accessions and in 74 commercial genotypes grown in glasshouse and field experiments that included phosphorus (P) supply as a treatment factor. Chromosomal quantitative trait loci (QTL) associated with [K]<sub>shoot</sub> and KUpE were identified using a genetic mapping population grown in the glasshouse and field. Putative QTL were tested using recurrent backcross substitution lines in the glasshouse. <h3>Key Results</h3> <p id="x-x-x-__p3">More than two-fold variation in [K]<sub>shoot</sub> was observed among DFS accessions grown in the glasshouse, a significant proportion of which could be attributed to genetic factors. Several QTL associated with [K]<sub>shoot</sub> were identified, which, despite a significant correlation in [K]<sub>shoot</sub> among genotypes grown in the glasshouse and field, differed between these two environments. A QTL associated with [K]<sub>shoot</sub> in glasshouse-grown plants (chromosome C7 at 62·2 cM) was confirmed using substitution lines. This QTL corresponds to a segment of arabidopsis chromosome 4 containing genes encoding the K<sup>+</sup> transporters AtKUP9, AtAKT2, AtKAT2 and AtTPK3. <h3>Conclusions</h3> <p id="x-x-x-__p4">There is sufficient genetic variation in <em>B. oleracea</em> to breed for both KUtE and KUpE. However, as QTL associated with these traits differ between glasshouse and field environments, marker-assisted breeding programmes must consider carefully the conditions under which the crop will be grown.</p>
<p><strong>Key words: </strong><em>Arabidopsis</em>, <em>Brassica oleracea</em>, genetics, potassium (K), potassium use efficiency (KUE), quantitative trait loci (QTL), shoot</p>
Details
- Title
- Genetic analysis of potassium use efficiency in Brassica oleracea
- Creators
- P J White - Scottish Crop Research Institute,J P Hammond - University of WarwickGraham J King - Rothamsted ResearchH C Bowen - University of WarwickR M Hayden - University of WarwickM C Meacham - University of WarwickW P Spraklen - University of WarwickM R Broadley - University of Nottingham
- Publication Details
- Annals of Botany, Vol.105(7), pp.1199-1210
- Identifiers
- 1652; 991012821252802368
- Academic Unit
- Faculty of Science and Engineering; Southern Cross Plant Science; Science
- Resource Type
- Journal article