Variation Within Pure Lines of Wild Oats (Avena fatua) in Relation to Degree of Primary Dormancy

Abstract

The germination of caryopses on water or GA3 solutions was used to characterize the degree of primary dormancy present in the seed progeny of 10 genetically pure lines of wild oats (Avena fatua L. # AVEFA). These 10 lines represented a range of types from lines exhibiting no dormancy to those with a high degree of dormancy. Repeated propagation of these pure lines under constant environmental conditions identified several genetically inherited characters that were associated with the inherited differences in degree of primary dormancy. Correlation of the seed development period, number of primary caryopses produced, and caryopsis moisture content to the degree of primary dormancy shows: a) Lines characterized by low degrees of primary dormancy were, in general, those that had a short seed development time and produced few heavy seed low in percent water; and b) lines characterized by high degrees of primary dormancy were, in general, those that had a long seed development time and produced many light seed high in percent water. The adaptive advantage of the coupling of physiological and morphological characters with degree of dormancy is discussed and the possibility that some characters are determined by others is indicated.

Regulation of Avena Fatua Seed Germination by Smoke Solutions, Gibberellin A3 and Ethylene

“…Similarly, PoljakoffMayber et al (2002) observed that GA 3 did not affect the germination of dormant intact Avena sativa propagules although it did accelerate the germination of dissected dormant caryopses. It has been shown that GA 3 has a stimulatory effect on the germination of dormant Avena fatua caryopses (Adkins et al 1986;Fennimore and Foley 1998).…”

“…Dormant seeds of Avena fatua L. (wild oat) do not germinate under conditions which normally favour germination (Fennimore and Foley 1998) although germination can be enhanced by gibberellin A 3 (GA 3 ) (Adkins et al 1986;Fennimore and Foley 1998), ethylene (Adkins and Ross 1981) or smoke extract (Adkins and Peters 2001). To date, knowledge about the role of smoke in the regulation of Avena fatua seeds is very limited.…”

Cloning and characterization of differentially expressed genes in imbibed dormant and afterripened Avena fatua embryos

“…Genetically pure dormant line M73 and nondormant line SH430 wild oat seeds (Avenafatua L.) were used [1]. M73 plants were grown in a greenhouse at constant temperature (20 + 3 ° C) and photoperiod (18 h light, 6 h dark).…”

Effects of prolonged light on germination of six lines of wild oat (Avena fatua)

“…There is considerable genetic variability of germination behavior in the natural wild oat population (Naylor and Jana 1976;Adkins et al 1986). This genetic variability is evident, with respect to both the duration of primary dormancy and seed response to changing environmental factors, in genetic lines of this very persistent weed of temperate cereal crops (Simpson 1990).…”