Combining Ability Estimate in F2 Flax Populations for Some Quantitative Traits Under Normal and Saline Soil Conditions

Abstract

The present investigation was conducted using six flax genotypes with their 15 F2 crosses grown under two environments {normal soil (E1= Kafr El-Hamam-Shrkia Governorate) and saline soil (E2= Tag El-Ezz,-El Dakahlia Governorate)} to determine the combining ability and gene action of some agronomic flax characters in these entries (parents and their crosses). In 2009/10 season, the six parents { P1= Giza 8, P2 (S.402/1) , P3 (S.420/140/5/11), P4 (S.421/43/14/7), P5 (S.533/39/5/3) and P6 (Daniela)} as well as their 15 progenies were sown in first week of November to evaluated in a randomized complete block design with three replicates at the two above-mentioned locations. High ratio of GCA/SCA revealed that additive played greater role than nonadditive genetic effects in the inheritance of straw weight and its components as well as seed weight, 1000-seed weight and number of seeds/capsule under the two environments and combined analysis. On the other hand, both additive and nonadditive types of gene action were involved in the inheritance of number of capsules/plant. Mean squares of interaction between environment and both types of combining ability for most studied traits revealed that the magnitude of both additive and non-additive types of gene action varied from environment to another. Whereas the non-additive genetic effects are more influenced by saline environment than additive effects in each of straw weight, plant height, technical stem length, seed weight, 1000-seed weight and number of seeds per capsule. While, additive gene effects were much more influenced by saline environment than non-additive effects for number of capsules per plant. P5(S.533/39/5/3) exhibited good general combining ability effects for straw weight per plant and its two important components; plant height and technical stem length in addition P2 for both seed weight and 1000-seed weight as well as P1 for 1000-seed weight under the two environments and combined data. For Sij effects, one cross (P5P6) which exhibited positive significant SCA effects for straw weight per plant and its components as well as seed weight per plant and number of capsules per plant in addition three crosses (P1xP3, P1xP6 and P4xP6) for 1000-seed weight under the two environments and combined analysis. Therefore, these crosses are suitable in breeding program for increasing the previous characters. The correlation between cross means and their SCA values was significant and positive for straw weight and its components as well as seed yield and its two important components, number of capsules per plant and 1000-seed weight indicating that high performing crosses were high specific combinations.

Combining General and Special Ability and Genetic Action of Linum Usitatissimum L.

“…In the second density, Father 4 is significantly positive (771.69) at the level of (1%) Fathers 6 and 7 are significantly different from zero in desired positive direction and as harvest guide All fathers are insignificant and in both densities and Fathers 3 and 7 had positive effects that are significantly different from zero in the first density and Fathers 5 has positive general effects different from zero in the second density and thus can be introduced into hybrid programs to obtain early genetic makeup, Father 6 has had effects on the general combining capacity in the number of capsules, seed crop and biological quotient. This is an important indicator of the possibility of utilizing the education programs to increase the outcome at election in the isolationist generations shared by this father and these results are consistent with some qualities and some parents of a number of researchers [10][11][12][13][14][15][16][17].…”

“…Table (10,11) shows that the additional variation is significantly different from zero in all the characteristics studied and in both densities except the number of branches m 2 and the weight of 1000 seeds, the biological product, the harvest guide in the first density, the capsule seed count and the harvest guide in the second density. This is an indication that the effect of the genetic act varies according to environmental competition in the linen crop consistent with Zaid [4,5].…”

Combining Ability and Heterosis for Earliness, Growth and Biological Yield of Some Flax Genotypes at Normal-irrigation and Water-Shortage Environments

“…Flax cultivars significantly varied in their agronomic characters (ElKady, Eman and Abd El-Fatah, 2009;El-Kady, Eman and Abo-Kaied, 2010;El-Refaie, Amena andHussein, 2012 andHussein et al, 2015). Significant necessary (negative or positive) heterosis evaluations over mid and better parent were detected in earliness, yield and yield components in numerous cross combinations of linseed (Pant andMishra, 2008 andReddy et al, 2013).…”

Resistance of Some Flax Genotypes to Podwery Mildew and Effect of the Disease on Yield and Yield Components.

“…Simple correlation coefficients among flax yield and yield attributes estimated by many investigators (Momtaz et al, 1977;El-Shaer et al, 1983;Aly and Awaad, 1997;Al-Kaddoussi and Moawad 2001;El-kady and Abd-El-Fatah 2009;Hussein, 2012;and El-Refaie, and Hussein, 2012).…”