In:
Canadian Journal of Plant Science, Canadian Science Publishing, Vol. 91, No. 1 ( 2011-01), p. 191-198
Abstract:
Zuo, S., Yin, Y., Zhang, L., Zhang, Y., Chen, Z., Gu, S., Zhu, L. and Pan, X. 2011. Effect and breeding potential of qSB-11 LE , a sheath blight resistance QTL from a susceptible rice cultivar. Can. J. Plant Sci. 91: 191–198. Sheath blight (SB) caused by Rhizoctonia solani is one of the most important diseases of rice worldwide. The QTL qSB-11 LE , located on chromosome 11 of an SB-susceptible Oryza japonica rice cultivar Lemont, was identified in previous studies. In this study, its effect on SB resistance and its potential in breeding programs were evaluated using a set of near-isogenic lines (NILs) that exhibit three different genotypes at the qSB-11 LE locus and seven backcross populations. Results of field disease evaluation under artificial inoculation showed that the inheritance of resistance of qSB-11 LE to SB is controlled by additive gene action and that the genes have a dosage effect on SB resistance. In greenhouse evaluations, the resistance effect of qSB-11 LE was expressed at 11 and 14 d after inoculation at the tillering stage. Analysis of field resistance of six BC 1 F 1 populations and one BC 2 F 1 population, developed from the backcrosses between Lemont as the donor parent and six commercial O. indica rice cultivars as recurrent parents, indicated that qSB-11 LE could be effectively used to enhance these cultivars’ SB resistance. These observations suggest that the qSB-11 LE has considerable potential in rice breeding for resistance to SB, and that its flanking molecular markers could be employed in practical breeding programs for marker-assisted selection.
Type of Medium:
Online Resource
ISSN:
0008-4220
,
1918-1833
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2011
detail.hit.zdb_id:
2016989-9
SSG:
12
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