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1

Inheritance of resistance to stripe rust in winter wheat cultivars Aquileja and Xian Nong

100%

Feng J., Zhang Z., Li G., Zhou Y., Wang H., Guo Q., Sun J.

Journal of Applied Genetics

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2007

|

vol. 48

|

issue 1

43-46

EN

Winter wheat cultivars Aquileja (AQ) and Xian Nong 4(XN) were previously reported to possess durable, quantitative resistance to stripe rust disease. In the present study, AQ, XN and a susceptible wheat cultivar were reciprocally crossed in all 6 combinations. Parents, F1, F2, F3, BCP1 and BCP2 were used to determine quantitative genetic parameters for infection type and disease severity. The results showed that fixable genetic components preponderated in the inheritance of the resistance in AQ and XN for both infection type and disease severity, while the dominant component could be detected in some cases. The resistance was conditioned by oligogenes. Heritability of the resistance ranged from 50 to 79% in most cases.

2

Inheritance of resistance to powdery mildew (Oidium lycopersicum Cooke & Massee, emend. Noordeloos & Loerakker) in accessions of three wild species of Lycopersicon

100%

Kozik E. U.

Journal of Applied Genetics

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1999

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vol. 40

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issue 3

175-183

EN

Three resistant accessions: L. hirsutum LA1775, L. pennellii LA716, L. chilense LA2747, and the susceptible breeding line A100, were crossed to develop F1, F2 and BC1 populations for genetic analysis of tomato resistance to Oidium lycopersicum Cooke & Massee, emend. Noordeloos & Loerakker, the causal agent of powdery mildew. The resistances in all the studied wild species of Lycopersicon were dominant, but controlled by different numbers of genes depending on the source of resistance. Two incompletely dominant genes control the resistance in L. hirsutum, but one major gene has a stronger expression than the second minor gene. L. pennellii carries three cumulative dominant genes. The resistance of L. chilense is governed by one partially dominant gene that is less effective than the resistance genes of L. hirsutum.

3

Inheritance of resistance to stripe rust in winter wheat cultivars Aquileja and Xian Nong 4

100%

Feng J., Zhang Z., Li G., Zhou Y., Wang H., Guo Q., Sun J.

Journal of Applied Genetics

|

2007

|

vol. 48

|

issue 3

43-46

EN

Winter wheat cultivars Aquileja (AQ) and Xian Nong 4(XN) were previously reported to possess durable, quantitative resistance to stripe rust disease. In the present study, AQ, XN and a susceptible wheat cultivar were reciprocally crossed in all 6 combinations. Parents, F1, F2, F3, BCP1 and BCP2 were used to determine quantitative genetic parameters for infection type and disease severity. The results showed that fixable genetic components preponderated in the inheritance of the resistance in AQ and XN for both infection type and disease severity, while the dominant component could be detected in some cases. The resistance was conditioned by oligogenes. Heritability of the resistance ranged from 50 to 79% in most cases.

4

Inheritance of resistance to Ustilago nuda (Jens.) Rostr. in some spring barley cultivars

100%

Kozera W., Roszko A.

Journal of Applied Genetics

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1995

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vol. 36

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issue 2

119-127

EN

The inharitance of resistance to loose smut (Ustilago nuda) in seven cultivars of spring barley has been examined.The performed showed that, resistance to two different groups of U.nuda races in respect of their virulance is determined by a single allele pair in the cvs.Anoidium and Inerme 2-r and by two allele pairs in the cvs. CI 13 662, Dorsett, Jet and OAC 21.In the cv,Abyssinian, resistance to a group of races 2 is determined by a single allele pair, whereas that to a group of races 4 - by two allele pairs.In all studied cultivars (except Anoidium) the resistance dominates over sensivity.Resistance to the both studied groups of U.nuda races is determined by a similar genes in the cvs. Dorsett and CI 13 662, as well as in Dorsett and OAC 21.No similarity was found between resistance genes in the case of two allele pairs in the cvs. Jet, Abyssinian and CI 13 662 (group of races 4) as well as in Jet, Dorsett and OAC 21 (in both groups of races), and in the case of single allele pair in the cvs.Inerme-2-rowed and Abyssinian (group races 2).

5

Preliminary studies on the inheritance of white coat colour in Arctic foxes (Alopex lagopus L.)

100%

Filistowicz A., Wierzbicki H., Przysiecki P.

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vol. 38

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issue 1

57-64

EN

. Main genes determining white coat colour in Arctic foxes are: recessive gene d and incompletely dominant, autosomal gene S with lethal effect in homozygous condition. The white coat colour of Arctic foxes bred on Polish farms had been determined solely by the recessive gene until the 1970s, when the Shadow variety was imported from Norway. The genetic code of the two varieties was different, but this fact was not taken into account. The results obtained in the present study do not confirm the theories on the heredity of white coat colour of Arctic foxes. The authors of these theories assumed that the coat colour depends on the presence of a recessive gene, the only factor responsible for the white furcoat. Apart from Polar and Shadow white foxes, there is a wide variety of darker white animals, and this fact suggests that there is a number of cumulative genes responsible for the intensity of coat pigmentation.

6

Inheritance of water use efficiency in diallel hybrids of spring barley under varied nutrition and soil moisture

88%

Gorny A. G.

Journal of Applied Genetics

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1999

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vol. 40

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issue 1

15-28

EN

Inheritance of water use efficiency (WUE) at the whole-plant level was investigated in a diallel set (Ps+F2s) of spring barley. Plants were grown in 9 dm3 pots under optimal conditions, low NPK nutrition and low soil moisture. GCA effects were found to be of major importance for the variance in vegetative and economic WUE measures. A significance of SCA effects was observed only under nutrient and soil moisture stresses. The stress conditions used did not considerably affect the sign and magnitude of combining ability effects. Consistency between GCA and parental means was found. The efficiency of water use under stress did not correlate with stress tolerance indices, but stress-induced changes in the harvest index and WUE were closely related to the tolerance. An analysis of genetic components of variation indicated that additive gene effects were of major importance for the vegetative and economic WUE measures. Moderately high narrow-sense heritabilities of WUE under optimal conditions (0.64-0.69) were found to decrease to 0.46-0.53 and 0.13-0.35 under limited fertilization and simulated drought, respectively. Partial dominance of genes was observed. The degree of dominance of genes was found to increase under stress. The results suggest that a low WUE is a recessive character. It is supposed that the preponderance of additive gene effects should facilitate selection efforts to improve WUE in spring barley.

7

Identification of QTLs associated with citrus resistance to Phytophthora gummosis

88%

Siviero A., Cristofani M., Furtado E. L., Garcia A. A. F., Coelho A. S. G., Machado M. A.

Journal of Applied Genetics

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2006

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vol. 47

|

issue 1

23?28

EN

Citrus gummosis, caused by Phytophthora spp., is an important citrus disease in Brazil. Almost all citrus rootstock varieties are susceptible to it to some degree, whereas resistance is present in Poncirus trifoliata, a closely related species. The objective of this study was to detect QTLs linked to citrus Phytophthora gummosis resistance. Eighty individuals of the F1 progeny, obtained by controlled crosses between Sunki mandarin Citrus sunki (susceptible) and Poncirus trifoliata cv. Rubidoux (resistant), were evaluated. Resistance to Phytophthora parasitica was evaluated by inoculating stems of young plants with a disc of fungal mycelia and measuring lesion lengths a month later. Two QTLs linked to gummosis resistance were detected in linkage groups 1 and 5 of the P. trifoliata map, and one QTL in linkage group 2 of the C. sunki map. The phenotypic variation explained by individual QTLs was 14% for C. sunki and ranged from 16 to 24% for P. trifoliata. The low character heritability (h2 = 18.7%) and the detection of more than one QTL associated with citrus Phytophthora gummosis resistance showed that inheritance of the resistance is quantitative.

8

The inheritance of resistance of some Brassica oleracea L. cultivars and lines to downy mildew - Peronospora parasitica (Pers.)ex Fr.

88%

Hoser-Krauze J., Lakowska-Ryk E., Antosik J.

Journal of Applied Genetics

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1995

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vol. 36

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issue 1

27-33

EN

Resistance to downy mildew was tested on resistant cultivars: Brasica oleracea PI246077 and PI231210, a broccoli-cauliflower line from Polish selection susceptible cauliflower lines and their F1 and F2 progenies.Infections degree of the inoculated plants was determined at the cotyledon and 4-5 leaf stages.To estimate score plant infection at the 4-5 leaf stage the Williams scale designed for plants inoculated at the cotyledon stage was modified.Resistance to the Polish fungus isolate proved to be dominant character.At the cotyledon stage depending on the source of resistance, it was determined by a four (in a broccoli-cauliflower line) or three (in PI USA) dominant complementary genes, while at the stage of 4-5 leaves - by a single dominant gene (in PI231210), two (in PI246077) or three (in the broccoli-cauliflower line) additive dominant genes.

9

Resistance to the potato leafroll virus (PLRV) in the progeny of a highly resistant potato clone

88%

Swiezynski K. M., Dziewonska M. M., Ostrowska K.

Genetica Polonica

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1993

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vol. 34

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issue 2

139-146

EN

Segregation for resistance to PLRV was evaluated in three families originating from mating of a highly resistant with , which differed in their to . The virus concentration and external in graft-inoculated plants served as criteria of resistance. The mean level of progeny resistance was never inferior to the mid-parent value and usually exceeded it. Some genotypes in the progeny were at least as resistant as their highly resistant parent. Susceptible genotypes were not found in the progeny. The results obtained are consistent with the assumption that a high level of resistance to PLRV is a cumulative effect of dominant genes.

10

Inheritance of seed dormancy in Tibetan semi-wild wheat accession Q1028

75%

Lan X.-J., Wei J.-M., Liu D.-C., Yan Z.-H., Zheng Y.-L.

Journal of Applied Genetics

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2005

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vol. 46

|

issue 2

133-138

EN

Tibetan semi-wild wheat (Triticum aestivum ssp. tibetanum Shao) is one of the Chinese endemic hexaploid wheat genetic resources, distributed only in the Qinghai-Xizang Plateau of China. It has special characters, such as a hulled glume and spike disarticulation. However, seed dormancy, another important character for wheat resistance to pre-harvest sprouting, was rarely reported. Seed dormancy of more than 10 Tibetan semi-wild wheat accessions was evaluated, and their germinations were 0% or near 0% with both treatments of threshed seeds and intact spikes at hard dough stage. Tibetan semi-wild wheat accession Q1028 was investigated for its seed dormant characters by testing the seed germination percentages of intact spikes, seeds with bract powder, normal seeds, seeds with pierced coat, and sectioned embryos. It was observed that embryo dormancy of Q1028 accounted for its seed dormancy. Using threshed seeds and intact spikes at hard dough stage, the inheritance of seed dormancy was carried out using the F1, F2, F3 and F2BC1 populations of the cross between Q1028 and a wheat line 88?1643, susceptible to preharvest sprouting. The germinations of seeds and intact spikes in F1 plants were 1.0% and 0.9%, respectively. It indicated that seed dormancy of Q1028 was inherited as a dominant trait. From the genetic analysis of the F2, F3 and F2BC1 populations it was found that the strong seed dormancy of Q1028 was controlled by two dominant genes.

11

Induction and characterization of streptomycin-resistant mutants in Capsicum praetermissum

75%

Venkataiah P., Christopher T., Subhash K.

Journal of Applied Genetics

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2005

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vol. 46

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issue 1

19-24

EN

Streptomycin-resistant mutants were isolated from mutagenised cotyledon explants of Capsicum praetermissum Heiser & Smith. The explants were mutagenised with N-ethyl-N-nitrosourea, which resulted in a high frequency of streptomycin-resistant mutants (18.0%) and a low frequency of chlorophyll-deficient (albino) mutants (8.0%). Complete streptomycin-resistant plantlets were obtained after rooting of the regenerated green shoots on rooting medium containing 1.0 mg L?1 IAA and 500 mg L?1 streptomycin sulphate. Leaf-segment assay of these plantlets revealed that they were resistant to streptomycin but sensitive to chloramphenicol, kanamycin, lincomycin, and spectinomycin. Reciprocal crosses between streptomycin-resistant and -sensitive plants showed a non-Mendelian transmission of resistance by female parents.

12

Genetic studies on collar rot resistance in opium poppy (Papaver somniferum L.)

75%

Trivedi M., Dhawan O. P., Tiwari R. K., Sattar A.

Journal of Applied Genetics

|

2005

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vol. 46

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issue 3

279-284

EN

The collar rot disease has been reported recently and occurs at the 10-12-leaf stage of plants of opium poppy. Infected plants topple down and dry prematurely due to fast rotting at the collar region. The inoculum for this study was multiplied on the cornmeal-sand cuture. Genetic ratios were calculated by the ?2 test. Inheritance studies on this disease show a monogenic pattern of segregation with the ratio of 3 : 1 at F2, 1 : 2 : 1 at F3 and 1 : 1 at the backcross. Such genetic ratios clearly indicate that a single ressisive gene (rs-1) is responsible for disease resistance in opium poppy. The infrenece drawn on the basis of the present study will be a great help in the future breeding programme of opium poppy for collar rot resistance.

13

The inheritance of plant height in crosses involving short-stem rye genotypes

75%

Izdebski R.

Journal of Applied Genetics

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1995

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vol. 36

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issue 4

325-340

EN

The paper presents results of studies on the inheritance of plant height in four short-stem genotypes of rye selected from genotypically different collection materials.Short-stem genotypes P-2, P-9, P-30 and P-52 were crossed to a tall-stem inbred line Uniwersalne 145 (S17).The genotype P-2 was additionally crossed to a related, but tall-stem line P-2 W.In each cross combnations six generation -P1, P2, F1, F2, B1 (F1 x P10 and B2 (F1 x P2) - were examinaed.Distribution of plant height in hybrid generations haad a continous character, which indicated a polyugenic determination of short stem an all "P" genotypes under study.Results of the genetic analysis showed a significant role of additive, dominance and epistatic gene action in genetic determinatin of short stem in th "P" genotypes.

14

Efficiency of nitrogen and phosphorus utilization in progenies of factorial crosses between European and exotic cultivars of spring barley (Hordeum vulgare L.)

63%

Gorny A. G., Ratajczak D.

Journal of Applied Genetics

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2008

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vol. 49

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issue 4

349-355

EN

Previous observations suggested that some landraces, primitive cultivars and other barleys originating from the harsh conditions of the Middle East, North Africa and Tibet might serve as interesting sources of adaptation to low-input agriculture. This opportunity was verified in field experiments performed under reduced rates of nitrogen (N) and phosphorus (P) fertilization. Genetic variation in major components of the efficiency of N and P utilization was examined among F2 and F3 generations of crosses between four European female and seven exotic male lines of spring barley. Preponderance of general combining ability effects was found for most efficiency components, suggesting that the characters are mainly controlled by additive gene action. Non-additive effects appeared to be less or non-significant. Under reduced fertilization, hybrid progenies of the Syrian cv. M.Dingo/D.Alla 106 and the Moroccan cv. Moroc 9-75 exhibit an enhanced yielding and the highest capacity to utilize N and P efficiently in grain mass formation. The results proved that the exotic barleys appear to be particularly useful for breeding programs aiming at improved barley adaptation to less favourable fertilization regimes.

Refine search results

Inheritance of resistance to stripe rust in winter wheat cultivars Aquileja and Xian Nong

Inheritance of resistance to powdery mildew (Oidium lycopersicum Cooke & Massee, emend. Noordeloos & Loerakker) in accessions of three wild species of Lycopersicon

Inheritance of resistance to stripe rust in winter wheat cultivars Aquileja and Xian Nong 4

Inheritance of resistance to Ustilago nuda (Jens.) Rostr. in some spring barley cultivars

Preliminary studies on the inheritance of white coat colour in Arctic foxes (Alopex lagopus L.)

Inheritance of water use efficiency in diallel hybrids of spring barley under varied nutrition and soil moisture

Identification of QTLs associated with citrus resistance to Phytophthora gummosis

The inheritance of resistance of some Brassica oleracea L. cultivars and lines to downy mildew - Peronospora parasitica (Pers.)ex Fr.

Resistance to the potato leafroll virus (PLRV) in the progeny of a highly resistant potato clone

Inheritance of seed dormancy in Tibetan semi-wild wheat accession Q1028

Induction and characterization of streptomycin-resistant mutants in Capsicum praetermissum

Genetic studies on collar rot resistance in opium poppy (Papaver somniferum L.)

The inheritance of plant height in crosses involving short-stem rye genotypes

Efficiency of nitrogen and phosphorus utilization in progenies of factorial crosses between European and exotic cultivars of spring barley (Hordeum vulgare L.)