Breeding for bacterial wilt resistance in tropical tomato

Opena R.T., . and Hartman G.L., . and Chen J.T., . and Yang C.H., . (1990) Breeding for bacterial wilt resistance in tropical tomato. [Proceedings Paper]

The Asian Vegetable Research and Development Center AVRDC initiated research on bacterial wilt Pseudomonas solanacearum of tomato in 1973 to understand the population dynamics of the pathogen; develop resistant screening protocols; identify resistant stocks; determine the genetic basis of resistance; and to develop tropically adapted resistant cultivars. More than 100 strains tested all belonged to biotype III or Race 1. Population of bacteria in soil was monitored and reduced by the addition of a soil amendment. Inoculation methods viz. stem puncture leaf clipping infectivity titration and natural field screening were evaluated. A highly reliable field screening method was thus devised and adopted as the standard protocol since 1986. The most resistant germplasm in the AVRDC collection is L 285 a primitive type L. esculentum var. cerasiforme; however more advanced germplasm for Hawaii and North Carolina which showed acceptable levels of resistance have been used in the breeding program. A seven-parent diallel experiment indicated that both additive and non-additive gene actions regulate the genetic system for wilt resistance. In a test of fresh market F1 hybrids the proportion of wilt-resistant F1's was generally higher when both parents were resistant compared to resistant x susceptible crosses. However in some processing hybrids with one susceptible parent the resistance was comparable to the highly resistant stocks L285 and CLN 65-349 indicating non-additive action. In the AVRDC tropical tomato breeding program selection for complex traits e.g. wilt resistance is delayed until selection reaches the family or line stage

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Abstract

The Asian Vegetable Research and Development Center AVRDC initiated research on bacterial wilt Pseudomonas solanacearum of tomato in 1973 to understand the population dynamics of the pathogen; develop resistant screening protocols; identify resistant stocks; determine the genetic basis of resistance; and to develop tropically adapted resistant cultivars. More than 100 strains tested all belonged to biotype III or Race 1. Population of bacteria in soil was monitored and reduced by the addition of a soil amendment. Inoculation methods viz. stem puncture leaf clipping infectivity titration and natural field screening were evaluated. A highly reliable field screening method was thus devised and adopted as the standard protocol since 1986. The most resistant germplasm in the AVRDC collection is L 285 a primitive type L. esculentum var. cerasiforme; however more advanced germplasm for Hawaii and North Carolina which showed acceptable levels of resistance have been used in the breeding program. A seven-parent diallel experiment indicated that both additive and non-additive gene actions regulate the genetic system for wilt resistance. In a test of fresh market F1 hybrids the proportion of wilt-resistant F1's was generally higher when both parents were resistant compared to resistant x susceptible crosses. However in some processing hybrids with one susceptible parent the resistance was comparable to the highly resistant stocks L285 and CLN 65-349 indicating non-additive action. In the AVRDC tropical tomato breeding program selection for complex traits e.g. wilt resistance is delayed until selection reaches the family or line stage

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	LYCOPERSICON ESCULENTUM
AGROVOC Term:	RESISTENCIA A LA ENFERMEDAD
AGROVOC Term:	MARCHITEZ/ FITOMEJORAMIENTO
AGROVOC Term:	TOMATE
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15283

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