Genetic Studies on Tomato Yellow Leaf Curl Begomovirus (TYLCV) Resistance in Egypt: Six-population Analysis

摘要

Five crosses derived from crossing between TYLCV -susceptible female, (Edkawy, Castle Rock, Strain-B, Peto-86 and Marmmande) and TYLCV -resistant male (Favi-9) were performed. Favi-9 is derived from Licopersecon hirsutum . Six population of each cross were planted in complete-random blot distribution (CRBD) with 3 replicates during 2002-2004 growing seasons at Kaha, ARC Research Station. Field and laboratory evaluation was done for each population individuals for finding out TYLCV resistance as the main goal. Evaluation process explained that parent hetorosis values were 5.72 to 14.9% and 112.7 to 128.7% for crosses of Marmmande x Favi-9 and Castle Rock x Favi-9, respectively. The heritability estimate was 55.76 and 88.38% for crosses of Edkawy x Favi-9 and Peto-86 x Favi-9, respectively. Potency Ratio Values showed that crosses of Marmmande x Favi-9 and Castle Rock x Favi-9 ranges between -0.11 and -0.30, respectively. Those values are the least ones obtained. The inbreeding depression has presented in most crosses under investigation. Its estimate was ranged between -4.82 and-27.66% for the crosses of Strain-B x Favi-9 and Castle Rock x Favi-9, respectively. Conclusion pointed out that effective gene for TYLCV resistance could be one to two pairs of genes.