Inheritance of supernumerary spikelets in a tetraploid wheat cross

Abstract

The supernumerary spikelet (SS) trait of durum wheat (Triticum turgidum L.), including the four-rowed and ramified spike types, is characterized by an increased number of spikelets per spike. To determine the inheritance of this trait, the tetraploid ramified spike cultivar PI349056 was crossed reciprocally to normal-spike 'Langdon' durum, and the F1 was backcrossed to each parent. The F1, F2, F3, BC1F1, and BC1F2 were classified for SS expression. Additionally, PI349056 was crossed to the 'Langdon' 2D(2A) disomic substitution line to study linkage of SS genes. The SS trait was recessive to normal spike, and both four-rowed spike and ramified spike progeny were observed in the segregating generations. Segregation in F3 and BC1F2 families indicated that SS in PI349056 was quantitatively inherited, controlled by a major recessive gene and numerous minor genes. Normal-spiked plants selected in families homozygous for the major gene indicated that the major gene did not produce SS when the minor genes were absent. Selection of normal-spiked plants in the F3 and F4 of 'Langdon' 2D(2A) disomic substitution/PI349056 indicated that the minor SS genes were not linked to the major gene on chromosome 2A.Key words: Triticum, branched spike, ramified spike, four-rowed spike.

FRIZZY PANICLE Drives Supernumerary Spikelets in Bread Wheat

“…S1). In tetraploid and hexaploid wheat species, the development of SS is a recessive trait (Pennell and Halloran, 1983;Klindworth et al, 1990b;Dobrovolskaya et al, 2009) and Figure 1. SS phenotypes in bread wheat.…”

“…es 2nd , Ectopic spikelet of the is modulated by a number of environmental factors (Sharman, 1944;Pennell and Halloran, 1983). In tetraploid wheat (genome nomenclature, BBAA), the SS trait is quantitatively inherited, controlled by a single major gene acting in concert with an unknown number of minor genes (Klindworth et al, 1990b;Haque et al, 2012). It has been suggested that the SS trait in hexaploid wheat (BBAADD) is determined by either two (Pennell and Halloran, 1983) or three (Koric, 1980) loci.…”

SSR Mapping for Locus Conferring on the Triple-Spikelet Trait of the Tibetan Triple-spikelet Wheat (<i>Triticum aestivum</i> L. concv. <i>tripletum</i>)

“…Some of studies found that the multiple spikelet might be dominant or partially dominant trait inheritance controlled by one or two genes (Sun et al, 2009;Sun et al, 2000;Chapman and McNeal, 1971;Dencic, 1988). Also some studies found that multiple spikelet traits could be quantitative inheritance, usually jointly controlled by a major gene and several minor genes (Zheng, 1994a;1994b;Klindworth et al, 1990a;1990b;Millet, 1987). Previous studies on chromosome analysis by using monomer and nullisome of Chinese Spring had some multiple spikelet gene mapped on the chromosomes of 2A, 4A, 5A, 7A, 2B, 4B, 2D, 3D and 6D (Peng et al, 1998a;1998b;Zheng et al, 1994b;Yen et al, 1995), of which there was a strong genetic effect on the chromosome 2D (Peng et al, 1998a).…”

Microsatellite mapping of genes for semi-dwarfism and branched spike in Triticum durum Desf. var. ramosoobscurum Jakubz. “Vetvistokoloskaya”

“…Dobrovolskaya et al (2009) mapped the mrs gene on chromosome 2DS using microsatellite markers. In wheat, the supernumerary spikelets trait is recessive (Pennell and Halloran 1983;Klindworth et al 1990a;Peng et al 1998;Martinek and Bednář 2001). The expression of the trait is modulated by a number of environmental factors (Sharman 1944;Pennell and Halloran 1983).…”