Evaluation of inheritance to leaf rust in wheat using area under disease progress curve

Abstract

Six varieties, Kundan (K), Galvez-87 (G), Trap (T), Chris (C), Mango (M) and PBW-348 (P) along with fast ruster, Agra Local (AL), were screened for seedling reaction and adult pant response to leaf rust. Seedlings of all six varieties were susceptible while adult plants showed lower susceptability response than Agra Local. The F1s among the varieties, and also with Agra Local, showed the values lesser than the respective mid parental values for AUDPC suggesting a polygenic mode of inheritance. ANOVA for combining ability effects indicated variation due to the GCA and SCA effects, which indicated that both additive as well as non-additive type of genetic variances, govern AUDPC. The higher values for the GCA variance over the SCA variance indicated the predominance of an additive component over the dominance component for AUDPC. Significant values for GCA effects indicated that Kundan, Galvez-87 and Trap can be used as good general combiners for AUDPC. The crosses, KxAL, GxAL and TxAL showed significant sca effects for AUDPC, which indicated the predominance of non-additive gene effects in these crosses. Additive x additive and dominance x dominance components of the 5- parameter model were highly significant and contributed maximum extent compared to the additive and dominance components in the cross KxG, while dominance and dominance x dominance components contributed maximum in the remaining crosses. Under such a situation, improvement in the character may be expected through standard selection procedure, which may first exploit the additive gene effects and simultaneously care should be taken to see that the dominance effects are not dissipated, but rather they should be concentrated.

Heterosis and combining ability analysis of slow rusting stem rust resistance and yield and related traits in bread wheat

“…This indicated the involvement of additive and non-additive gene actions in determining the inheritance of the studied characters. Results of this study were in accordance with the findings of Ahamed et al (2004), Kumar et al (2011) and Fellahi et al (2013), who reported significant differences for both GCA and SCA for these traits. The components of variance indicated more GCA variance (1051.82) than SCA variance (139.45) for AUDPC of stem rust (Table 4).…”

“…This indicated the partial dominant nature of stem rust resistance in these crosses. Different levels of intermediate disease reactions in most of the slow ruster 9 slow ruster and slow ruster 9 susceptible crosses were observed, suggesting a polygenic mode of inheritance of rust resistance (Ahamed et al 2004;Irfaq et al 2009). The AUDPC value of 625.0 in fast ruster 9 fast ruster was higher than the AUDPC value of 582.0 in its susceptible parent.…”

“…Breeding for slow rusting resistance requires knowledge on the genetics of resistance in wheat genotypes. The genetics of this type of resistance has been investigated by studying the rate of disease development (Ahamed et al 2004).…”

Inheritance of race 1.2 Fusarium wilt resistance in four melon cultivars

“…In this case, however, the additive 9 dominance interaction [j] is negative, which indicates that the gene interaction may be considered duplicated (Mather and Jinks 1977). This duplicate epistasis may have a small role in selection as it decreases the effect of heterosis in selection (Lal-Ahamed et al 2004), and it also points to the presence of resistance factors in the susceptible parent.…”

Leaf Rust Resistance and Molecular Identification of Lr 34 Gene in Egyptian Wheat

“…The csLV34a allele (229 bp) was detected in the check cultivar Giza 139 and csLV34b allele (150 bp) was detected in the near isogenic line Thatcher Lr 34 (Figure 1 of AUDPC (up to 840). Consequently, these varieties classified as the highly susceptible or fast rusting varieties group [25] found that the wheat cultivar Agra Local showed the highest value of AUDPC (1300), the wheat cultivar Kundan showed least AUDPC value (217). While the wheat cultivars Trap (317), Galvez-78 (344), Mango (412), Chris (504) and PBW-348 (737) [26] reported that the wheat cultivars Chenab 70, WL 711, Pak.…”