ASSOCIATION, VARIATION, HERITABILITY AND PATH COEFFICIENT ANALYSIS OF FIVE F3 WHEAT FAMILIES UNDER SALINE CONDITIONS | ||
| Journal of Plant Production | ||
| Article 5, Volume 27, Issue 2, February 2002, Pages 739-749 PDF (4.97 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2002.253317 | ||
| Authors | ||
| A. I. A. Hassan,; S. A. N. Afiah | ||
| Plant Breeding Unit, Plant Genetic Resources Dept., Desert Research Center EI-Matariya, Cairo. | ||
| Abstract | ||
| Five F3 selected families of bread wheat were evaluated at Ras Sudr Research Station of (ORC), South-Sinai Governorate in 2000/2001 growing season under salinity conditions of soil and irrigation water ( about 9875 and 10000 ppm, respectively ). At 90 days after sowing, 10 guarded plants were selected randomly to measure chemical contents in a composite sample of each F3 family leaves i.e proline (lin. freslil· samples), KINa ratio, Mg, CI and S04 (in dry samples). At harvest, fifteen competitive piants frorr» eacJn' pJbi weJ1e; selectee, to rec.ma' observations (ill, plant tTeight, number. of spikes- / plant; spjke;leliTg)vl', number-of'qrairrs zspike lODCl'-grain weigMt< and grain yield / plant. Simple correlations, phenotypic & genotypic..c:o.efficients of vailiabilily, her.itability and path analysis were calcuiated; The obtained results can be summarized as follbws: Inter-relationships among the studied characters under such saline conditions varied in magnitude according to the F3 population genotypes. Correlations between grain yield / plant and each of the chemical composition of leaves as well as yield components were positive and significant in most cases except for CI content which was negatively correlated to grain yield / plant. For improving grain yield under such saline conditions, the following traits: heavy grains, high number of grains/spike, high content of proline in fresh leaves and low chloride content in dry leaves considered to be a suitable selection criteria. Heritability values varied among traits and between populations studied therefore, selection for the yield attributes may be effective for improving grain yield which had low to moderate (GCV) values among F3 selected families. Hence, the direct selection for improving yielding ability is not effective and path analysis must be done to detect the joint effects. The total contribution of each chemical component in leaves showed that proline content was the most powerful determinant of grain yield in S8" 18 F3 family as it contributed by 20.33%. In general, chemical contents could be arranged over all studied F3 populations as follows: S04 , proline, Mg, K / Na and CI. The main source of grain yield variation was 1000- grain weight followed by number of grains / spike and number of spikes / plant in three or more of F3 families. Such highly contributed traits easily measured and gave a valuable idea for selection to yield improvement under saline environments. | ||
| Keywords | ||
| Bread wheat (Triticum aestivun L.); Segregating generation; Salinity stress; Phenotypic and genotypic correlations; Variability and heritability; Path coefficient analysis | ||
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