Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae

Bnejdi, Fethi; Saadoun, M; Allagui, Mohamed Bechir; Hanbury, Colin

doi:10.1590/s1415-47572010005000027

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Epistasis seems to play a significant role in the genetic adaptability of cultivars when cultivated under water deficiency. Similar results were reported for resistance to Septoria tritici in durum wheat (Bnejdi et al, 2011) and resistance to Phytophthora nicotianae (Bnejdi et al, 2010, Ceballos et al, 1998 found that epistasis was more pronounced in non-acid than in acid solution for grain yield in maize. Genetic interactions complicate the procedure of fixation of desirable genes in the suitable varieties.…”

supporting

confidence: 85%

Variation of gene effects of six agronomic traits with water regimes in durum wheat

Bnejdi¹,

Saadoun²,

Rassaa³

2013

Afr. J. Biotechnol.

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This study was carried out to determine the relative importance of additive, dominance and epistatic effects of six agronomic traits evaluated in two crosses under irrigated and rainfed conditions. Separate generations mean analyses revealed that gene effects were dependent upon water regime. Under irrigated regime, only additive and dominance effects were implicated in inheritance of all traits, except plant height in the two crosses and grains per spike in the cross Razzek × Chili. However, under rainfed condition, additive, dominance and epistasis effects were induced in the genetic control of these traits. Thus, epistasis effect was water regime depended and seems to play a significant role in the genetic adaptability of populations. The variation of inheritance and the presence of genetic interactions complicate the procedure of breeding. Under irrigated regime, selection would be simpler because only additive and dominance effects were implicated in the genetic control of all traits. Consequently, the genetic mechanism would not be stable when plants are grown in environment with lower water availability. However, for the stability of suitable cultivars, selection under rainfed condition (lower water availability) was suggested. The moderate to high narrow-sense heritability estimates for the majority of traits indicate that selection would be efficient.

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supporting

confidence: 85%

Variation of gene effects of six agronomic traits with water regimes in durum wheat

Bnejdi¹,

Saadoun²,

Rassaa³

2013

Afr. J. Biotechnol.

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“…The additive-dominance model (m, a, d) showed correlation coefficient values (r) that ranged from 0.68 to 0.93 for all evaluated traits, except for dry matter content (DMC) (r = 0.53) (Table 4), suggesting the suitability of this model to explain the genetic parameters of all traits but DMC. The presence of epistasis complicates selection (Bnejdi et al, 2009;2010). In the present study, the absence of this phenomenon, for the majority of evaluated traits, facilitates selection based on all variables analyzed.…”

Section: Gene Effectsmentioning

confidence: 74%

Genetic control of plant size-related traits and fruit in ornamental pepper (Capsicum annuum L.)

et al. 2022

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Peppers present a very diversified market and have a high economic and nutritional value. The study of genetic control of quantitative traits helps to conduct an efficient breeding program. This study aimed to estimate the genetic parameters and gene effects involved in the inheritance of morpho-agronomic traits in ornamental pepper (Capsicum annuum L.). The experiment was carried out in a greenhouse, at the Plant Biotechnology Laboratory, at the Federal University of Paraíba. Two accessions of ornamental pepper (C. annuum L.) belonging to the vegetable germplasm bank of the Federal University of Paraíba were used as parents: UFPB 347 and UFPB 356. The experimental design was completely randomized, with five plants of each parent being evaluated, 20 plants of generation F1, 90 plants of generation F2 and 40 plants of RC1 and RC2. Foram avaliados 19 caracteres quantitativos referentes à planta, flor e fruto. Os dados obtidos foram submetidos à análise de geração, e os efeitos dos modelos foram submetidos ao teste t no nível de 5% e 1% de significância. Alta herdabilidade em sentido amplo foi encontrada para comprimento da corola, diâmetro das pétalas, peso do fruto, comprimento do fruto e espessura do pericarpo. Para herdabilidade restrita, apenas o comprimento da corola apresentou herdabilidade alta. O modelo aditivo-dominante (m, a, d) foi adequado para explicar os parâmetros genéticos da maioria das características avaliadas, com exceção do comprimento da antera e do teor de matéria seca, para os quais o modelo completo foi interpretado. Palavras-chave: análise de geração, Capsicum annuum, aumento.

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“…Damping off, stem and foliar blight, Phytophthora root rot, are pathologies caused by fungi as Phytophthora capsici Leo, Fusarium spp., Rhizoctonia solani Kühn., Alternata spp. and are factors limiting yield (Fayzalla et al, 2009;Bnejdi et al, 2010). One method to control the phytopathogen fungi is by antagonist microorganisms as Trichoderma spp.…”

Section: Introductionmentioning

confidence: 99%

<i>Trichoderma</i> sp Native from Chili Region of Poanas, Durango, Mexico Antagonist against Phytopathogen Fungi

Valencia¹

2011

American Journal of Agricultural and Biological Sciences

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Problem statement: Presence of Trichoderma spp. in agricultural soils decrease incidence of diseases by phytopathogen fungi. Sanity diagnostic require to know if exist beneficial microorganism and what agricultural practices help to their propagation. Approach: Samples (30) were taken from soils and sick plants of ten sites in four localities of Valley of Poanas. Phytophthora capsici Leo, Rhizoctonia solani Kuhn and Trichoderma sp were isolated in agar V8 and were identified by microscopy. Results: In the 30 samples analyzed the presence of Phytophthora capsici Leo and Rhizoctonia solani Kuhn was determined. Two isolations of Trichoderma sp were obtained from soil, they had antagonist activity against to P. capsici and R. solani on agar-V8 medium and showed chitinase activity. Sugar production in chitinase (10 mg.mL-1) by crude extract of Trichoderma growth in basal medium more chitin was determined. The average of sugar production from strains were 0.1175 and 0.1125 mg.mL-1 and standard deviations were 0.0567 and 0.0567 in four repetition. Interviews were applied to fifty farmers about cultivars and cultivation practices. At least seven types of chili were cultivated in the region of the Valley of Poanas, inorganic fertilization, irrigation systems by channel, gates and pumps were used. One hundred percent of farmers reported diseases of Damping off and Phytophthora root. Biocides were not used to control these diseases. Conclusion: The natural presence of Trichoderma spp was detected in Valley of Poanas, but some practices as inorganic fertilization and irrigation system can be contributing to propagation of phytopathogen fungi

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Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae

Cited by 7 publications

References 19 publications

Variation of gene effects of six agronomic traits with water regimes in durum wheat

Variation of gene effects of six agronomic traits with water regimes in durum wheat

Genetic control of plant size-related traits and fruit in ornamental pepper (Capsicum annuum L.)

<i>Trichoderma</i> sp Native from Chili Region of Poanas, Durango, Mexico Antagonist against Phytopathogen Fungi

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