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A major QTL for thrips resistance (Frankliniella occidentalis) on chromosome 7 of pepper (Capsicum annuum)

IP.com Disclosure Number: IPCOM000247917D
Publication Date: 2016-Oct-11
Document File: 2 page(s) / 18K

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Abstract

Frankliniella occidentalis is the major species of thrips found on pepper in Europe. Thrips cause damage by feeding on pepper fruits, flowers and leaves, reduce photosynthetic capacity and yield. Additionally, the thrips feeding causes symptoms such as bronzing and silvering of the fruits, thereby reducing fruit quality. Thrips feeding can also lead to transmittal of several viruses, one of the most important being Tomato Spotted Wilt Virus (TSWV). Several Quantitative Trait Loci (QTL's) have already be mapped for thrips resistance. For example, Maharijaya et al. 2015 (Theor Appl Genet. 128(10): 1945–1956) describe a QTL on chromosome 6 of pepper, derived from AC1979 (Accession CGN16975). C. annuum AC 1979 is highly resistant and other QTLs for thrips resistance have previously been mapped in this accession, such as QTLs on chromosome 5 and on chromosome 3 mapped by Syngenta using the same source, see WO2008135510. Herein we describe a major QTL for thrips resistance on chromosome 7.

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A major QTL for thrips resistance (Frankliniella occidentalis) on chromosome 7 of pepper (Capsicum annuum)

Frankliniella occidentalis is the major species of thrips found on pepper in Europe. Thrips cause damage by feeding on pepper fruits, flowers and leaves, reduce photosynthetic capacity and yield. Additionally, the thrips feeding causes symptoms such as bronzing and silvering of the fruits, thereby reducing fruit quality. Thrips feeding can also lead to transmittal of several viruses, one of the most important being Tomato Spotted Wilt Virus (TSWV).

Several Quantitative Trait Loci (QTL’s) have already be mapped for thrips resistance. For example, Maharijaya et al. 2015 (Theor Appl Genet. 128(10): 1945–1956) describe a QTL on chromosome 6 of pepper, derived from AC1979 (Accession CGN16975). C. annuum AC 1979 is highly resistant and other QTLs for thrips resistance have previously been mapped in this accession, such as QTLs on chromosome 5 and on chromosome 3 mapped by Syngenta using the same source, see WO2008135510. 

Herein we describe a major QTL for thrips resistance on chromosome 7.

The QTL was mapped in an F3 population from a cross between a Thrips resistant F4 breeding line with a Thrips susceptible high level inbred Dembre line. Sixty five F3 families, one plot per family, depending on seed germination, 4-12 plants per plot of this population were grown in plastic tunnels in Italy during spring/summer 2013. Thrips infection was natural disease pressure. Feedi...