RFLP facilitated analysis of tiller and leaf angles in rice (Oryza sativa L.) |
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Authors: | Zhikang Li Andrew H Paterson Shannon RM Pinson James W Stansel |
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Institution: | (1) Department of Soil and Crop Sciences, Texas A&M University, College Station, 77843, U.S.A;(2) USDA-ARS, Route 7, Box 999, Imes Rd., Beaumont, TX, 77713, U.S.A;(3) Texas A&M University System Agricultural Research and Extension Center, Route 7, Box 999, Imes Rd., Beaumont, TX, 77713, U.S.A |
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Abstract: | Plant type is an important composite trait associated with the yield potential in rice and other cereal crops. Several characters
associated with the plant type of modern rice cultivars including tiller angle, leaf and flag leaf angle, were investigated
using a complete linkage map with 115 well distributed RFLP markers and progeny testing of 2418 F2 derived F4 lines from a cross between O. sativa ssp. japonica cv. ‘Lemont’ and spp. indica cv. ‘Teqing’. One major gene (Ta) and 11 QTLs were largely responsible for the tremendous variation of the three plant type characters in the Lemont/Teqing
F2 population. The major gene, Ta, located between RZ228 and RG667 on chromosome 9, accounted for 47.5% of the phenotypic variation in tiller angle and had
large pleiotropic effects on both leaf and flag leaf angles. This gene plus four QTLs accounted for 69.1% of the genotypic
variation in tiller angle. Eight additional QTLs for leaf and flag leaf angles were also identified, which collectively explained
52.0 and 66.4% of the genotypic variation of these traits. Ta and three QTLs ( QFla2, QFla5 and QFla7) apparently affected the related plant type characters differently, suggesting their
possible differential expression in different developmental stages of rice plants or possibly clustering of different genes
affecting these traits. Plant type, and consequently grain yield of rice, may be improved by deliberately manipulating these
QTLs in a marker-assisted selection program.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | ideotype pleiotropy QTLs yield potential |
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