Combining ability in the F1 and F2 generations of a diallel cross in six-rowed barley (Hordeum vulgare L.)

Abstract

The F1 and F2 progenies of a ten-parent diallel cross (excluding reciprocals) were analysed for the combining ability of quantitative traits in six-rowed barley (Hordeum vulgare L.). significant differences were indicated between the parents, F1s and F2s for all the characters studied. The gca and sca components of variance were significant for all the traits. Both additive and non-additive gene effects were involved in the genetic control of the characters; however, non-additive gene effects were observed to be predominant. Among the parents RD 2035, RD 2052, RD 2503 and BL 2 were the best general combiners for grain yield and average to high combiners for other important traits.The parents RD 2552 and RD 387 were the best general combiners for dwarfness. The best specific crosses for grain yield were RD 2503 × RD 2585,RD 2035 × RD 2052, RD 2035 × BL 2, RD 2052 × BL 2, RD 2508 × RD 2552, RD 2552 × RD 2585 and Rd 2052 × RD 2552 in both the F1 and F2 generations. These crosses were higher yielders and in most of the crosses one of the parents involved was a good combiner, indicating that such combinations can be expected to produce desirable transgressive segregants. All the best crosses for grain yield also showed average to high sca effects for most of the yield components. Most of the specific crosses for grain yield involved high × average, average × average and average × poor general combiners. To ensure a further increase in grain yield, the combination of desirable yield components is advocated. The inclusion of F1 hybrids showing high sca, and having parents with good gca, in multiple crosses, bi-parental mating or diallel selective mating could prove a worthwhile approach for further amelioration of grain yield in six-rowed barley.

Estimation of Combining Ability for Yield and its Components in Barley Under Normal and Stress Drought Condition

“…These results indicate the superiority of these crosses in this trait. These results are in general agreement with those reported by Ahmed (1990), Bhatnagar and Sharma (1997), Sharma et al (2003), Mahmoud, Badeaa (2006)…”

“…Data indicated that P 1 was a good combiner for number of grains/spike and 100-grain weight under both conditions; P 2 for grain yield/plant under both conditions, spike length, spikes/plant, number of grains/spike under stress and plant height under Normal ; P 3 for plant height and grain yield/plant under both conditions and number of grains/spike under stress; P 4 for 100-grain weight under both conditions, spikes/plant under stress and plant height under Normal; P 5 for plant height and number of grains/spike under Normal and P 6 for spike length and grain yield/plant under Normal. Similar results were obtained by Ahmed (1990), Singh et al (2002), Sharma et al (2003), Mahmoud, Badeaa (2006), Amer (2010), Amer et al (2011) and Ismaeil (2015).…”

Genetic Studies on Yield and Its Components in Some Barley Crosses

“…of spikes/plant, the first cross for no. of grains/plant and the third, the fourth and the fifth crosses for 100-grain weight, which was agreement with the results obtained by Soylu (2002) and Sharma et al, (2003).…”

“…On the other hand, it was negative highly significant for days to heading and maturity dates in the second and the fifth crosses; flag leaf area in the fifth cross, in chlorophyll content in all crosses except for the first cross was non-significant. These results are in harmony with those obtained by Sharma et al, (2003), Singh et al, (2002), Eid (2006), El-Sayed (2007) and El-Shawy (2008).…”

“…While, highly significant and negative additive × additive type was found for heading dates in the first, the third and the fifth crosses, maturity dates in the second and the fifth crosses, flag leaf area in the third and fifth crosses, chlorophyll content in the third cross, plant height and 100grain weight in the second crosses. El-Hosary et al, (1992), Abul-Naas et al, (1993), El-Seidy (1997a), El-Seidy (1997b), Nawar et al, (1999), Bhatnagar et al, (2001) and Sharma et al, (2003) obtained similar results.…”