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<p><i>Capsicum annuum</i> including both chilli and bell peppers, is the most cultivated pepper species worldwide, which is highly vulnerable to <i>Phytophthora</i> diseases causing severe yield losses, because of the lack of a completely resistant bell pepper variety. This study was aimed to investigate the inheritance patterns and various gene actions linked to resistance against <i>Phytophthora</i> foliar blight and fruit rot by evaluating parents, F<sub>1</sub>, reciprocal F<sub>1</sub> (RF<sub>1</sub>), F<sub>2</sub>, reciprocal F<sub>2</sub> (RF<sub>2</sub>), and backcross (BC<sub>1</sub>P<sub>1</sub> and BC<sub>1</sub>P<sub>2)</sub> generations derived from four crosses which involved two commercially important and highly susceptible bell pepper cultivars, ‘Solan Bharpur’ and ‘California Wonder’, and a highly resistant Mexican chilli landrace, ‘CM334’. Notable mean differences were recorded in PDI and rAUDPC values of F<sub>1</sub>, BC<sub>1</sub>F<sub>1</sub> and their reciprocal generations except F<sub>2</sub>. Inadequacy of the additive-dominance model and prevalence of additive × additive epistatic interactions and maternal effects were inferred among the crosses. Meanwhile, dominance × dominance type of non-allelic interaction was noted in reciprocal crosses, which was a novel finding that emphasizes the selection of right female parent to improve <i>Phytophthora</i> resistance in peppers. Broad-sense heritability was highest in the cross CM334 × SB (43.6%) and SB × CM334 (41%) for <i>Phytophthora</i> foliar blight, while maximum narrow-sense heritability was recorded in the cross CM334 × SB and CW × CM334. These findings suggested a considerable influence of environmental on the expression and inheritance of <i>Phytophthora</i> fruit rot resistance as compared to the foliar blight resistance.</p>

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Genetic analysis of resistance to Phytophthora blight and fruit rot in Capsicum annuum under artificial and natural epiphytotic conditions

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Surender Kumar,
  • Anupama Singh,
  • Devinder Kumar Mehta,
  • Chander Mohan Singh Bist

摘要

Capsicum annuum including both chilli and bell peppers, is the most cultivated pepper species worldwide, which is highly vulnerable to Phytophthora diseases causing severe yield losses, because of the lack of a completely resistant bell pepper variety. This study was aimed to investigate the inheritance patterns and various gene actions linked to resistance against Phytophthora foliar blight and fruit rot by evaluating parents, F1, reciprocal F1 (RF1), F2, reciprocal F2 (RF2), and backcross (BC1P1 and BC1P2) generations derived from four crosses which involved two commercially important and highly susceptible bell pepper cultivars, ‘Solan Bharpur’ and ‘California Wonder’, and a highly resistant Mexican chilli landrace, ‘CM334’. Notable mean differences were recorded in PDI and rAUDPC values of F1, BC1F1 and their reciprocal generations except F2. Inadequacy of the additive-dominance model and prevalence of additive × additive epistatic interactions and maternal effects were inferred among the crosses. Meanwhile, dominance × dominance type of non-allelic interaction was noted in reciprocal crosses, which was a novel finding that emphasizes the selection of right female parent to improve Phytophthora resistance in peppers. Broad-sense heritability was highest in the cross CM334 × SB (43.6%) and SB × CM334 (41%) for Phytophthora foliar blight, while maximum narrow-sense heritability was recorded in the cross CM334 × SB and CW × CM334. These findings suggested a considerable influence of environmental on the expression and inheritance of Phytophthora fruit rot resistance as compared to the foliar blight resistance.