Genetic Variation for Resistance to Russian Wheat Aphid in F2-Derived Families of Wheat (Triticum aestivum L.) | ||
| Journal of Agricultural Science and Technology | ||
| Article 6, Volume 9, Issue 1, 2007, Pages 55-60 PDF (83.59 K) | ||
| Authors | ||
| A. Arzani* 1; N. L. V. Lapitan2 | ||
| 1Agronomy and Plant Breeding Department, College of Agriculture, Isfahan University of Technology, Isfahan, 84155, Islamic Republic of Iran. | ||
| 2Soil and Crop Sciences Department, Colorado State University, Fort Collins, CO 80523, U.S.A. | ||
| Abstract | ||
| The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a significant insect pest of wheat worldwide. The objective of this study was to assess the genetic variation within and between F2-derived families for reaction to RWA using F3 and F4 families originating from individual F2 plants of a cross between the susceptible line (synthetic hexaploid-11) and the resistance cultivar (‘Halt’). The RWA damage of individual plants within each family was measured using different procedures. Their reaction types were combined into a single data for each individual family (derived from an individual F2 plants) and subjected to statistical analysis. Results indicated that the genetic variation between F2-derived families is greater than within F2-derived families for RWA resis-tance. Broad-sense heritability of RWA resistance, calculated by partitioning phenotypic variation into genetic and environmental components, was 73.2%. A narrow-sense herita-bility estimate of 30% was obtained for the RWA resistance in the ‘Halt’ synthetic hexaploid-11 cross using parent-offspring (F3: F4) regression procedure. | ||
| Keywords | ||
| Wheat; Genetic Variation; heritability; Insect resistance; Russian wheat aphid | ||
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