Breeding for drought tolerance and the association of grain yield and other traits of bread wheat | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 16, Volume 82, Issue 3, September 2004, Page 1227-1241 PDF (4.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2004.265146 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| AHMED M. TAMMAM1; MOSTAFA S. EL-ASHMOONY2; ABDEL-HAKIM A. EL-SHERBENY2; IBRAHIM A. AMIN1 | ||||
| 1Wheat Research Department, Field Crops Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| 2Agronomy of Department, Faculty of Agricultural, EL-Minia University, Egypt | ||||
| Abstract | ||||
| Two populatic b of bread wheat ( Triticvm aes&um L.) were used in selection fo drought tolerance in the F2, F3 and F. generations during th three growing seasons 1998/99, 99/2000 and 2000/2001, respectively. Results of the drought susceptibility index showed that thirteen and eight tamales from 120 families representing the two populations, respectively were selected for high grain yield showed high tolerance for drought stress, as well as had low values of susceptibility index (D51) from (0.53 - 0.96) of population I and from (0.1 — 0.96) of population IL Stress tolerance index (STI) varied from (61.55 — 99.07) of the F4 families in population I and from (72.60 — 98.07) of the population II. Results of STI were In conformity with results of susceptibility index (D51). Phenotypic correlation under drought stress in the population I revealed that grain yield had positive and significant relationships with each of the number of spaces/plant, number of kernels/spike, 100-kernel weight, biological yield/plant, harvest index and number of days to heading in the F3 and F4 families except for number of days to heading in the F3 plants it was negatively and significantly correlated. The same trend was observed in the population II except for number of days to heading In F. it was insignificant and negatively correlated. The number of kernels/spike had insignificant and positive correlation in two generations. The magnitude of genotypic correlation was positive and significant for grain yield with each of the number of days to heading, flag leaf area, flag leaf water loss (in the F4 families only), plant height, number of spikes/plant number of Icemels/spike, 100-kernel weight, biological yiekl/plant and harvest index in the two Populations for F3 and F4 generations, as well as it had negative genotypic correlation with number of days to heading in F. families and flag leaf water loss in two generations. From the results of this study and these materials it can be concluded that these genotypes could be used as sources of drought tolerance or factors contributing to general adaptation or in releasing lines have high | ||||
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