Casual observations on F1 durum wheat plants grown outdoors near Rome for general breeding purposes suggested that at least some durum wheat cultivars carry either recessive or co-dominant CSBMV-resistance genes. A six-parent, diallel cross without reciprocals was set up to verify this hypothesis. The parents included cultivars Ionio (resistant = R), Neodur (R), Duilio (moderately resistant = MR), Cirillo (susceptible = S), Valnova (S), and Simeto (moderately susceptible = MS). The nine F1s derived from crosses between resistant and susceptible parents manifested a clearly susceptible reaction in terms of both symptom severity and ELISA value. On the other hand, they showed a slightly greater degree of CSBMV-resistance than the susceptible parents, suggesting that the minor genes for CSBMV-resistance contributed by the parental cultivars were prevalently dominant. Results indicated that the durum wheat cultivars Ionio, Neodur, and Duilio carry a recessive (or incompletely recessive) major CSBMV-resistance gene or gene-block, and that the six parental cultivars carry prevalently dominant modifiers that interact in disparate ways to induce small and, as yet unpredictable, modifications in the final expression of resistance in F1 plants.
|Autori:||Vallega, V.;De Vita, P.;Rubies-Autonell, C.;Ratti, C.|
|Data di pubblicazione:||2012|
|Titolo:||Resistance to cereal soilborne mosaic virus in durum wheat is recessive|
|Appare nelle tipologie:||1.1 Articolo in rivista|