Mapping and Tagging of Simply Inherited Traits - Genetics, Genomics and Breeding of Crop Plants - page 130

The lines NMS HA89-872 and NMS HA89-552 each carry a single recessive
male sterile gene ms6 and ms7 . Capatana et al. (2008) mapped the ms6 locus
to LG 16, which was flanked by the SSR markers ORS807 and ORS996 at a
distance of 7.2 and 18.5 cM, respectively. Ms7 was mapped by Li et al. (2008)
to LG 6 of the public SSR genetic map. The NMS mutant NMS360, induced
by streptomycin from line HA89, carries the single recessive gene ms9. This
gene was mapped to LG 10 of the public sunflower SSR linkage map (Chen
et al. 2006). Ms10 and the tightly linked anthocyanin pigment locus T were
mapped to LG 11 (Pérez-Vich et al. 2005). This male sterility source was first
described by Leclercq (1966). Line P21, carrying ms11 was released by the
USDA and the Texas Agricultural Experiment Station in 1970 (Jan 1992).
The ms11 gene was mapped to LG 8 (Pérez-Vich et al. 2005, 2006b).
4.5 Morphological Traits
4.5.1 Branching
The inheritance of branching is complex with both dominant and recessive
genes controlling this characteristic (see Miller and Fick 1997). For hybrid
breeding branching of restorer lines to extend the period of pollen production
is desired. As the hybrids have to be single-headed, only recessive branching
genes are useful. Inheritance of recessive branching was first reported by
Putt (1964) in which a single recessive gene, b1 , controlled branching. The
b1 locus was mapped by several groups. Gentzbittel et al. (1995, 1999) placed
b1 on group 7 of their consensus map. Mestries et al. (1998) found b1 to be
positioned on linkage group A, and Tang et al. (2006a) mapped b1 between
the markers ORS1088 and ORS930 on LG 10 of the public SSR map. Rojas-
Barros et al. (2008) developed target region amplification polymorphism
(TRAP) markers TBr4 720 and TBr8 555 , which were linked to the b1 gene in the
coupling phase at 0.5 cM and markers Tbr20-297 and Tbr20-494 flanked
the b1 locus in the repulsion phase at genetic distances of 7.5 and 2.5 cM,
respectively. They mapped b1 to group 16 of the RFLP map developed by Jan
et al. (1998), which also corresponds to LG 10 of the public SSR map.
Interestingly, b1 is linked to several QTLs for seed traits including seed oil
concentration, 1,000-seed weight, seed length, and others.
4.5.2 Leaf and Ray Color
Nearly 100% hybrids produced with the cytoplasmic male sterility system
are used for the commercial sunflower cultivation. Yue et al. (2008a) and
Yue et al. (2008b) provide with the genetic characterization and mapping of
the traits lemon ray flower color and chlorophyll deficiency, two
morphological markers for seed purification identification, and quality