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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (4): 765-777.doi: 10.16420/j.issn.0513-353x.2022-0094

• Research Papers • Previous Articles     Next Articles

Evaluation of Resistance to Citrus Canker Disease in Hybrid Progeny of Red Pomelo and American Citron

WANG Ping, SHENG Ling, YANG Jinpeng, ZHOU Linglei, JIN Yan, LUO Xuzhao, MA Xianfeng, DENG Ziniu()   

  1. Changsha Subcenter,National Center for Citrus Improvement,College of Horticulture,Hunan Agricultural University,Changsha 410128,China
  • Received:2022-05-02 Revised:2022-10-15 Online:2023-04-25 Published:2023-04-27
  • Contact: *(E-mail:deng7009@163.com) E-mail:deng7009@163.com

Abstract:

In order to investigate the genetic mechanism of citron in resistance against citrus canker disease(Xanthomonas citri subsp. citriXcc),in this study,the susceptible variety Red pomelo was crossed with the resistant genotype American citron and F1 hybrids were obtained. F2 progeny was further gained by self-crossing the F1 plants. Resistance identification wan performed on the F1 hybrid plants by in vivo inoculation of Xcc. All the F2 plants were in vitro inoculated and 225 F2 plants were successively identified for the resistance by in vivo inoculation. Bacterial quantification was conducted on some of the F2 plants following the inoculation with Xcc. The results from in vivo inoculation of F1 plants indicated that all F1 hybrids were susceptible,and no segregation between resistance and susceptibility was observed on the F1 progeny. In vitro identification of 253 F2 plants showed that 76 plants were resistant and 177 were susceptible. The results of in vivo inoculation on 225 F2 plants demonstrated that 72 plants were susceptible,with symptoms similar to those of the susceptible variety Bingtang sweet orange,118 slightly less susceptible than Bingtang sweet orange,but similar to those of the susceptible parent Red pomelo;10 were resistant,similar to the resistant parent American citron and four were resistant as the resistant genotype citron C-05. In addition,the symptoms of 21 F2 plants showed different reaction following the inoculation with Xcc between the adaxial and abaxial leaf surface. On 10 plants,typical canker symptoms appeared on the adaxial leaf surface but not on the abaxial one;while for the other 11 plants,the typical symptoms inversely emerged on the abaxial leaf surface and not on the adaxial leaf surface. The quantification results of Xcc on the inoculated leaves was consistent with the of in vivo identification. In summary,no segregation of resistance and susceptibility was observed in F1 progeny,but did in the F2 generation. The ratio of resistant to susceptible F2 plant was 115,indicating that resistance and susceptibility may be inherited as quantitative traits.

Key words: citron, Red pomelo, F2 plant, citrus canker disease, resistance identification, quantification of Xcc

CLC Number: