Simultaneous Selection for High Yielding and Stability of Some Economic Kenaf Characters

Abstract

The materials used for the present study consisted of fourteen kenaf genotypes (G) which were evaluated over six environments (three at Ismailia Governorate, two at Giza Governorate and one at El-Beheira Governorate) through three successive seasons (2009 to 2011). in Egypt. The analysis of variance revealed highly significant differences among genotypes, environments and G x E interaction for all studied traits, indicating a wide range of variation among genotypes, environments and these genotypes exhibited differential response to environmental conditions. The significant variance due to residual for all characters indicated that genotypes differed with respect to their stability suggesting that prediction would be difficult, which means that mean performance alone would not be appropriate. Interaction component of variance (σ 2 ge) was less than the genotypic variance (σ 2 g) for all characters. This means that genotypes differ in their genetic potential for these traits. The observed narrow range between phenotypic and genotypic coefficients of variability with high heritability in broad since for fiber percentage. Also, fiber weight per plant, technical stem length and plant height showed similar results, indicating possibility of using these three yield traits in selection criteria with giving more weight for fiber weight per plant and technical stem length for improving green stalk yield per plant in turn fiber yield. The criterion, yield stability (YSi) statistic indicated that S.105/2 and S.113 were proved to be superior in yield and stability for all characters studied as well as three genotypes, S.96/20, Giza3 and S.8 were stable for most characters studied. Therefore, the two genotypes (S.105/2 and S.113) maintained mean performance advantage across nearly all the environments sampled by maintaining high level for the above-mentioned traits and they are recommended to be released as commercial stable high yielding cultivars and/or to be incorporated in kenaf breeding program for producing stable high yielding lines. Phenotypic correlation coefficients among green stalk weight with other related characters of kenaf, indicated that, plant height, technical stem length, and fiber percentage are the major components contributing to green stalk weight per plant. Therefore, selection for these traits will improve green stalk weight per plant and in turn fiber yield in kenaf.

Performance of Some Promising Flax Lines for Yield and Its Components Under Normal and Sandy Soil Conditions

“…Similar finding regarding high coefficient of variation of seed weight/plant and No. of capsules/plant with high heritability estimates have reported by Kumar and Chauhan (1982), Frank and Hollosi (1985), Abo El-Zahab et al, (1994), Zahana and Abo- Kaied (2007) and Abo-Kaied et al, (2008). On the other hand, the low of PCV and GCV values in addition to the slight discrepancy between PCV (11.24%) and GCV (10.98%) values for seed index was reflected in the high heritability estimate (95.54%) for this trait.…”

“…Many investigations studied variance components, GxE interactions and stability in flax genotypes under different environments, and recorded different results for their stability across different environments in flax under normal conditions, i.e. Patil, et al, (1997), Foster et al, (1998), Abo El-Zahab and Abo-Kaied (2000), El-Hariri et al, (2004) and Abo-Kaied et al, (2007). The ultimate goal of flax breeding program in Egypt is to select genotype, which has high yielding potentiality, early mature, diseases resistant and tolerant to abiotic stresses (drought and salinity).…”