Diallel analysis of bacterial wilt resistance in tomato derived from different sources

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農業知識庫

作者：Peter M. Hanson, Olivia Licardo, Jaw-Fen Wang, Jen-tzu Chen,; 公佈日期：105 年 12 月 30 日

研究報告

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Bacterial wilt, caused by Ralstonia solanacearum, is a major constraint to tomato production in

the tropics and subtropics. Most bacterial wilt-resistant tomato cultivars have not shown consistently

high resistance levels over locations. The objective of this study was to determine

whether combining resistance derived from different sources would result in F1 progenies with

resistance greater than that of the parents. Five bacterial wilt-resistant tomato lines or accessions

(CL5915, L285, CRA84, H7997, and GA219), each derived from different resistance

sources, and a susceptible processing tomato line (UC204A) were crossed in all combinations

without reciprocals. Parents, F1 progenies, and F2 progenies were evaluated in greenhouses at

three locations (Taiwan, Philippines, and Indonesia) for percent survival 6 weeks after drench

inoculation with virulent local strains of R. solanacearum. Percent survival means over locations

were 17.4 to 83.0 for parents and F1 progeny and 16.2 to 75.0 for parents and F2 progeny.

The percent survival means over locations of L285 × H7997 were highest among crosses in the

F1 (83.0) and F2 (75.0) generations but were not significantly greater than that of H7997. Highly

significant mean squares were found in the F1 and F2 progenies for general combining ability

(GCA) and GCA × locations. Positive GCA effects over locations were detected for H7997,

CRA84, and L285, indicating that progeny with those lines as parents showed bacterial wilt

resistance that was greater than the average of all crosses. Only H7997, however, had positive

GCA effects estimates at each location for each generation, and its GCA effects estimates over

locations were significantly greater than those of the other parents in the F1 and F2 progenies.

Among this set of parents, H7997 is the best source to develop bacterial wilt-resistant progeny.

We did not observe statistically significant increases in resistance by combining different

resistance sources. However, the presence of large GCA variances suggests that hybridization of

parents that have high GCA for bacterial wilt resistance, such as H7997, CRA84, or L285,

followed by selection in segregating populations might yield inbred progeny with resistance

greater than that of the parents.

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