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Wheat Information
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Number 86: 19-24 (1998)
Research article
Genetic
control of oligo-culms in common wheat
Zheng-Song
Peng*, Chi Yen and Jun-Liang Yang
Triticeae Research Institute, Sichuan Agricultural University,
Dujiangyan City, Sichuan 611830, China
Summary
Genetic analysis of oligo-culms was carried out in the bread
wheat (Triticum aestivum) line "88F2185" by using
the regular cultivar Chinese Spring (CS) monosomic series. The
difference of culm number per plant between reciprocal crosses was
nonsignificant, which means that cytoplasmic differences for culm
number per plant is absent. The result of test-cross experiment
revealed that the difference between "88F2185" and CS in
culm number per plant was due to only one gene, and the oligo-culms
was a dominant character. Based on the result of F2
monosomic analysis, the gene for oligo-culms of "88F2185"
was located on chromosome 2A. The symbol Tin2 is suggested to
represent this dominant gene.
Key words: Gene location, monosomic analysis, oligo-culms,
restricted tiller number, Triticum aestivum, wheat
Introduction
The culms of wheat (Triticum L.) comprise one main stem
and more or less fertile tillers. The production of tillers which are
destined to die constitutes a wastage of resources, since relocation
of nitrogen, minerals and carbon compounds from sterile tiller to the
rest of the plant is thought to be incomplete (Donald 1968). The
uniculm habit was first proposed by Donald (1968) as a mechanism to
avoid the formation of unproductive tillers, and this design was in
many breeders' mind. The potential to increase yield by restricted
tillering is supported by results from detillering experiments both
on barley (Jones and Kirby 1977; Kirby and Jones 1977; Yen 1964) and
on wheat (Islam and Sedgley 1981; Yen 1964).
Breeding toward to the ideotype of Donald (1968), breeders have
created a few uni- and oligo culms common wheat (T. aestivum
L.) materials. The uniculm habit is associated with some bad
agronomy characters (Yen et al. 1993), and the gene for uniculm of
common wheat was located on chromosome 1AS by Richards (quoted from
McIntosh et al. 1993). But the genetic control of oligo-culms is
unknown. To evaluate the value of oligo-culms in wheat breeding,
genetic analysis on it is necessary.
The present study was concerned with inheritance of oligo-culms, and
the chromosomal location of the gene for this character in common
wheat.
*Present address: Depertment of Biology, Sichuan Normal College.
Nanchong City, Sichuan 637002, China
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