Genetic adaptability of the inheritance of the resistance to different levels of aggressiveness of Septoria tritici isolates in durum wheat

Bnejdi, Fethi; Saadoun, M

doi:10.1016/j.cropro.2011.03.013

Cited by 4 publications

(6 citation statements)

References 27 publications

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“…Li et al (2000Li et al ( , 2001) report significant micro-geographical genetic differentiation of populations of Triticum dicoccoides (wild emmer wheat) in response to water and aridity stresses. Similar result was showed for inheritance of resistance to S. tritici in durum wheat (Bnejdi et al, 2011b). Generation mean analysis revealed that the mode of inheritance was dependent upon the aggressiveness level of isolates.…”

Section: Epistasis and Genetic Adaptability To The Level Of Biotic Ansupporting

confidence: 82%

Genetic adaptability of inheritance of resistance to biotic and abiotic stress level on crop: Role of epistasis

Bnejdi¹,

Hanbary²,

Mohamed³

2011

Afr. J. Biotechnol.

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Several studies that attempt to identify the genetic basis of quantitative traits ignore the presence of epistatic effects and theirs role in plant genetic adaptability. Epistasis has been detected in the inheritance of many quantitative traits on crop. Moreover, generation means analysis of several traits assessed in diverse environmental conditions revealed that the mode of inheritance of each trait varied with the biotic or abiotic stress level. With less stress level, only additive and dominance effects was found significant. In contrast with moderate and higher stress level, epistatic effect was induced. Thus, a relationship was found between the complexity of model of inheritance and stress level. When the biotic or abiotic stress increases, epistasis effect was solicited and the more the stress increase, the amplitude of epistasis was more important and the model of inheritance was more complicated. This result was showed for resistance to 15 isolates of Septoria tritici in durum wheat with different levels of aggressiveness; for resistance to six isolates of Phytophthora nicotianae in pepper and for resistance to five salt concentrations at germination stage in durum wheat. Indeed, the generic effects of environment on genetic model of inheritance complicate the procedure of amelioration of quantitative traits. Hence, it is becoming evident that plant genetically expressed differences when operated in wide range of environments, and epistasis play a crucial role in genetic adeptness. The best way of crop breeding must therefore be investigated in each special environment.

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Section: Epistasis and Genetic Adaptability To The Level Of Biotic Ansupporting

confidence: 82%

Genetic adaptability of inheritance of resistance to biotic and abiotic stress level on crop: Role of epistasis

Bnejdi¹,

Hanbary²,

Mohamed³

2011

Afr. J. Biotechnol.

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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: 84%

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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“…Thus, the epistatic model with maternal and cytoplasmic effect was applied and revealed to be adequate for studying these different populations, indicating the complexity of inheritance of resistance to Z. tritici compared to the additive-dominance model. Similarly, several studies reported the presence of cytoplasmic and/or maternal effects in the inheritance of many quantitative traits such as resistance to yellow berry and Z. tritici in durum wheat [ 35 , 61 , 73 ]. Mazouz et al [ 39 ] studied the segregation pattern of the resistance to Z. tritici in RBC 2 and F 2 populations, generated from resistance bread wheat parents (THORNBIRD or RPB709.71/COC), and showed the presence of a cytoplasmic effect and the importance of the maternal effect in the disease resistance.…”

Section: Discussionmentioning

confidence: 99%

“…Only a few studies have reported the absence of an epistatic effect and the presence of an additive effect in inheritance of resistance to STB in durum wheat [ 7 ]. On the other hand, several reports have focused only on nuclear gene effects and found that inheritance to Z. tritici was governed by additive, dominance, and epistatic effects [ 35 – 38 ]. Therefore, it is considered of great importance to identify the cytoplasmic genetic information as a source of genetic diversity and to evaluate the existence of reciprocal resistance effects to this pathogen [ 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Detection of Maternal and Cytoplasmic Effects on Resistance to Zymoseptoria tritici in Durum Wheat

Hassine

Bnejdi

Bahri

et al. 2022

BioMed Research International

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Septoria tritici blotch (STB) is a major disease problem of wheat worldwide. To optimize the introgression of resistance genes in elite genotypes throughout traditional or molecular breeding programs, a full understanding of the quantitative inheritance of resistance to Zymoseptoria tritici, plant height (PH), and thousand kernel weight (TKW) is needed. In this study, maternal and cytoplasmic effects of resistance to STB were investigated using P1 (susceptible, high-yielding line) and P2 (resistant, low-yielding line) durum wheat lines and their F1, RF1, F2, RF2, BC1, RBC1, BC2, and RBC2 progeny, assessed for resistance to STB during three growing seasons. Duncan mean’s analysis revealed significant differences between generation means for STB, PH, and TKW. The two parents had an extreme pattern. The F1 and RF1 segregated close to their respective parents, suggesting the presence of cytoplasmic and maternal genetic effects for Z. tritici resistance, PH, and TKW. Separate generation mean’s analysis confirmed the results of the Duncan test. A three-parameter model was found to be not adequate for all traits in all three growing years; while a digenic epistatic model with cytoplasmic or/and maternal effect was adequate for all cases. Narrow-sense heritability was in the range of 50–60%, 30–69%, and 28–31% for STB, PH, and TKW, respectively. For STB, high heritability and the presence of fixable epistatic effect is encouraging and could lead to creating varieties with the right female parent to exploit cytoplasmic and maternal effects in order to improve resistance to Z. tritici in durum wheat.

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Genetic adaptability of the inheritance of the resistance to different levels of aggressiveness of Septoria tritici isolates in durum wheat

Cited by 4 publications

References 27 publications

Genetic adaptability of inheritance of resistance to biotic and abiotic stress level on crop: Role of epistasis

Genetic adaptability of inheritance of resistance to biotic and abiotic stress level on crop: Role of epistasis

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

Detection of Maternal and Cytoplasmic Effects on Resistance to Zymoseptoria tritici in Durum Wheat

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