Epistasis and heritability of resistance to Phytophthora nicotianae in pepper (Capsicum annuum L.)

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

doi:10.1007/s10681-008-9857-4

Cited by 15 publications

(13 citation statements)

References 24 publications

(24 reference statements)

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“…Epistasis has proven to be ubiquitous in plant resistance responses (Bnejdi et al, 2009;Fakhfakh et al, 2011;Keri et al, 1997) and in multiple instances of resistance to downy mildew (Perchepied et al, 2005;Shashikumar et al, 2010;Wang et al, 2001). Detection of nonallelic gene effects has important implications when designing effective breeding programs.…”

Section: Resultsmentioning

confidence: 99%

Inheritance of Resistance to Downy Mildew in Sweet Basil

Pyne

Koroch

Wyenandt

et al. 2015

J. Amer. Soc. Hort. Sci.

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Sweet basil (Ocimum basilicum) is one of the most economically important culinary herbs in the world, yet global production has become increasingly challenging due to the destructive disease downy mildew (Peronospora belbahrii). Although multiple sources of resistance have been identified, there are no resistant sweet basil cultivars with a commercially acceptable chemotype and phenotype available. The commercial basil cultivar Mrihani (MRI) was identified as resistant and crossed with a Rutgers University susceptible sweet basil inbred line (SB22) to generate a full-sibling family. To determine the mode of inheritance for resistance to downy mildew in basil, six related generations of the MRI × SB22 family were evaluated using a disease severity index (DSI) at northern and southern New Jersey locations over 2 years. All siblings in the F1 and BC1P2 generations were resistant (0.33 > DSI) providing strong evidence that inheritance of resistance from MRI was conferred by dominant alleles. Segregation ratios in the F2 and backcross to the susceptible parent (BCP1) generations demonstrated chi-square goodness of fit to the two-gene complementary (F2: P = 0.11, BC1P1: P = 0.04) and recessive epistatic (F2: P = 0.03, BC1P1: P = 0.63) models. Further analyses of gene effects using a weighted six-parameter scaling test provided evidence that nonallelic additive × additive and additive × dominant gene effects were highly significant (P < 0.001) and resistance reducing. This is the first report of heritable genetic resistance that can be introduced to sweet basil without the issue of sterility barriers. Plant breeding strategies using the MRI × SB22 family should exploit dominant gene action and remove recessive, resistance-reducing alleles from the population.

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Section: Resultsmentioning

confidence: 99%

Inheritance of Resistance to Downy Mildew in Sweet Basil

Pyne

Koroch

Wyenandt

et al. 2015

J. Amer. Soc. Hort. Sci.

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“…There are many published researches that associate some known genes to specific characters in the genus Capsicum (Zewdie and Bosland, 2000;Rêgo et al, 2009;Bnejdi et al, 2009). In some of these studies, the inheritance of quantitative characters related to plant morphology was not described in great detail.…”

Section: Resultsmentioning

confidence: 99%

Epistasis and inheritance of plant habit and fruit quality traits in ornamental pepper (Capsicum annuum L.)

Santos¹,

Rêgo²,

Borém³

et al. 2014

Genet. Mol. Res.

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ABSTRACT. Two accessions of ornamental pepper Capsicum annuum L., differing in most of the characters studied, were crossed, resulting in the F1 generation, and the F2 generation was obtained through selffertilization of the F1 generation. The backcross generations RC1 and RC2 were obtained through crossing between F1 and the parents P1 and P2, respectively. Morpho-agronomic characterization was performed based on the 19 quantitative descriptors of Capsicum. The data obtained were subjected to generation analysis, in which the means and additive variance ( Analysis of inheritance and epistasis in traits of pepper additive-dominant model, we estimated the additive effects, dominant effects and mean effects of possible homozygotes. The character fruit dry matter had the lowest value for broad sense heritability (0.42), and the highest values were found for fresh matter and fruit weight, 0.91 and 0.92, respectively. The lowest value for narrow sense heritability was for the minor fruit diameter character (0.33), and the highest values were found for seed yield per fruit and fresh matter, 0.87 and 0.84, respectively. The additive-dominant model explained only the variation found in plant height, canopy width, stem length, corolla diameter, leaf width, and pedicel length, but in the other characters, the epistatic effects showed significant values.

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“…The full model explained the traits of PH, FBH, SW, LL, LW, CL, DF L , F R W, F R L, PT, DMC, FYP and DF R (Table 4), as shown by of the low estimates of R 2 (1.01% to 53.8%) (Table 4). Bnejdi et al (2009), in studies with a segregating generation of Capsicum annuum, also reported failure in the additive-dominant model; they believed that this failure was due to the interaction among the genes that regulate the traits involved. PH (cm) -plant height; CW (cm) -canopy width; FBH (cm) -first bifurcation height; SW (cm) -stem width; LL (cm) -leaf length; LW (cm) -leaf width; CL (cm) -corolla length; F R W (g) -fruit weight; F R L (cm) -fruit length; F R D (cm) -fruit width; PT (cm) -pericarp thickness; DMC (cm) -fruit dry matter content; SYF -seed yield per fruit; FYP -fruit yield per plant; DF L -days to flowering; DF R -days to fruiting.…”

Section: Adequacy Of Modelsmentioning

confidence: 99%

Heritability of morpho-agronomic traits in ornamental pepper

Nascimento

Rêgo

Nascimento

et al. 2019

Crop Breed. Appl. Biotechnol.

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This study was conducted to identify the allelic interactions and genetic effects involved in genetic control of quantitative traits in Capsicum annuum. Six generations (P 1 , P 2 , F 1 , F 2 , BC 1 and BC 2) were used to study the variances, means and allelic interactions of 16 quantitative traits evaluated. The additive part of the phenotypic variance found for plant height, number of peppers per plant, days to flowering and days to fruiting lead to the conclusion that phenotypic selection in the F 2 generation are likely effective in obtaining genetic gains. According to the reduced model, the traits of canopy width, fruit width and number of seeds per fruit were not influenced by epistatic effects, but only by additive and dominant effects, which allows selection of superior individuals in segregating generations or improvement of these traits by means of hybridization.

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Epistasis and heritability of resistance to Phytophthora nicotianae in pepper (Capsicum annuum L.)

Cited by 15 publications

References 24 publications

Inheritance of Resistance to Downy Mildew in Sweet Basil

Inheritance of Resistance to Downy Mildew in Sweet Basil

Epistasis and inheritance of plant habit and fruit quality traits in ornamental pepper (Capsicum annuum L.)

Heritability of morpho-agronomic traits in ornamental pepper

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