title: A new reduced height gene found in the tetraploid  semi-dwarf wheat landrace Aiganfanmai.
abstract: Aiganfanmai is a dwarf tetraploid wheat landrace (Triticum  turgidum var. turgidum) that stably produces the semi-dwarf trait.  Plant height varies from 80-105 cm under cultivation. Compared with tall durum  wheat (T. turgidum var. durum) variety Langdon, we found it to  have short spikes and seeds, besides a semi-dwarf character. We crossed  Aiganfanmai with Langdon to analyze the genetic basis of the semi-dwarf trait.  The F(2) population  segregated at a 1:3 ratio for the short trait to the normal, which demonstrates  that Aiganfanmai carries a recessive reduced height (Rht) gene. This gene was  found to be located between the molecular markers Xgwm471 and Xgwm350 on  chromosome arm 7AS by microsatellite analysis. No Rht gene had been reported  from this chromosome; we designated it as Rht22. Rht 22, unlike other  previously reported Rht genes, does not reduce internodal cell length. Reduced  cell numbers might explain the short stem trait.
authors: Key Laboratory of Southwest China Wildlife Resources Conservation, College of Life Science, China West Normal University, Nanchong, China. pzs8833@163.com
authors: Z S
authors: ZS
authors: Peng
authors: X
authors: X
authors: Li
authors: Z J
authors: ZJ
authors: Yang
authors: M L
authors: ML
authors: Liao
mesh_terms: D017343:Genes, Plant; D009929:Organ Size; D018547:Plant Stems / Q000235:genetics* / Q000254:growth & development; D011123:Polyploidy; D040641:Quantitative Trait Loci / Q000502:physiology*; D014908:Triticum / Q000235:genetics* / Q000254:growth & development