scholarly journals New Sources of Resistance to Black rot in Crucifers and Inheritance of Resistance.

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1122f-1122
Author(s):  
Z. H. Guo ◽  
M. H. Dickson ◽  
J. E. Hunter
Keyword(s):  
Chinese Cabbage ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Brassica Species ◽  
Black Rot ◽  
Inheritance Of Resistance ◽  
Quantitative Inheritance ◽  
Sources Of Resistance ◽  
Moderate Resistance ◽  
High Level

Resistance to Black rot was studied in B. oleracea, B. campestris and B. napus, using three different inoculation procedures. The results indicated that hydathode inoculation without wounding and the wound suspension technique were useful for differentiating levels of resistance found in B. oleracea and B. campestris, but not in B. napus. Only the wound colony method allowed differentiation between high and moderate resistance in B napus. B. napus, PI 199947 and PI 199949, exhibited the highest resistance found in cultivated Brassica species. In B. campestris, two chinese cabbage accessions showed quantitative inheritance for moderate levels of resistance. In B. napus, the high level of reistance was conferred by one dominant gene, to which the symbol Br was assigned, whereas the moderate resistance was due to one recessive gene bm.

scholarly journals Brassica napus Sources of Resistance to Black Rot in Crucifers and Inheritance of Resistance

HortScience ◽  
1991 ◽  
Vol 26 (12) ◽  
pp. 1545-1547 ◽  
Author(s):  
H. Guo ◽  
M.H. Dickson ◽  
J.E. Hunter
Keyword(s):  
Brassica Napus ◽  
Xanthomonas Campestris ◽  
Dominant Gene ◽  
Black Rot ◽  
Inheritance Of Resistance ◽  
Quantitative Inheritance ◽  
Sources Of Resistance ◽  
Transfer Resistance ◽  
High Level ◽  
Unilateral Incongruity

Resistance to black rot caused by the bacterium Xanthomonas campestris pv. campestris was studied in Brassica oleracea, B. campestris, and B. napus. Two accessions of B. napus, PI 199947 and PI 199949, exhibited the highest resistance so far found in cultivated Brassica spp. In B. napus, the high level of resistance was conferred by one dominant gene. In B. campestris, two Chinese cabbage accessions showed quantitative inheritance for moderate levels of resistance. Resistance was transferred to B. campestris from B. napus, but a unilateral incongruity was observed for black rot and morphology, but not for stem color or bolting. The bridge line 15 was used to transfer resistance to B. oleracea.

scholarly journals Inheritance of Resistance to Bacterial Blight in 21 Cultivars of Rice

2003 ◽  
Vol 93 (2) ◽  
pp. 147-152 ◽  
Author(s):  
K. S. Lee ◽  
S. Rasabandith ◽  
E. R. Angeles ◽  
G. S. Khush
Keyword(s):  
Bacterial Blight ◽  
Oryza Sativa L ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Inheritance Of Resistance ◽  
Race 1 ◽  
Group 2 ◽  
Race 2 ◽  
Moderate Resistance ◽  
Group 1

Genetic analysis for resistance to bacterial blight (Xanthomonas oryzae pv. oryzae) of 21 rice (Oryza sativa L.) cultivars was carried out. These cultivars were divided into two groups based on their reactions to Philippine races of bacterial blight. Cultivars of group 1 were resistant to race 1 and those of group 2 were susceptible to race 1 but resistant to race 2. All the cultivars were crossed with TN1, which is susceptible to all the Philippine races of X. oryzae pv. oryzae. F1 and F2 populations of hybrids of group 1 cultivars were evaluated using race 1 and F1 and F2 populations of hybrids of group 2 cultivars were evaluated using race 2. All the cultivars showed monogenic inheritance of resistance. Allelic relationships of the genes were investigated by crossing these cultivars with different testers having single genes for resistance. Three cultivars have Xa4, another three have xa5, one has xa8, two have Xa3, eight have Xa10, and one has Xa4 as well as Xa10. Three cultivars have new, as yet undescribed, genes. Nep Bha Bong To has a new recessive gene for moderate resistance to races 1, 2, and 3 and resistance to race 5. This gene is designated xa26(t). Arai Raj has a dominant gene for resistance to race 2 which segregates independently of Xa10. This gene is designated as Xa27(t). Lota Sail has a recessive gene for resistance to race 2 which segregates independently of Xa10. This gene is designated as xa28(t).

scholarly journals Inheritance of Resistance to Zucchini Yellow Mosaic Virus in Watermelon

HortScience ◽  
2018 ◽  
Vol 53 (8) ◽  
pp. 1115-1118 ◽  
Author(s):  
Nihat Guner ◽  
Luis A. Rivera-Burgos ◽  
Todd C. Wehner
Keyword(s):  
Mosaic Virus ◽  
New Hampshire ◽  
Zucchini Yellow Mosaic Virus ◽  
Recessive Gene ◽  
Yellow Mosaic Virus ◽  
Inheritance Of Resistance ◽  
Single Recessive Gene ◽  
Sources Of Resistance ◽  
High Level ◽  
Severe Isolate

Sources of resistance to the Zucchini yellow mosaic virus-Florida strain (ZYMV-FL) have been identified within the Citrullus genus. Inheritance of resistance to ZYMV-FL was studied in PI 595203 (Citrullus mucosospermus), a resistant watermelon accession. The F1, F2, and BC1 progenies derived from the cross ‘Calhoun Gray’ (CHG) × PI 595203 and ‘New Hampshire Midget’ (NHM) × PI 595203 were used to study the inheritance of resistance to ZYMV-FL. Seedlings were inoculated with a severe isolate of ZYMV-FL at the first true leaf stage and rated weekly for at least 6 weeks on a scale of 1 to 9 on the basis of severity of viral symptoms. A single recessive gene (zym-FL) was found to control the high level of resistance to ZYMV-FL in PI 595203.

Inheritance of resistance to Ascochyta blight in lentil

2001 ◽  
Vol 54 ◽  
pp. 198-201 ◽  
Author(s):  
G. Ye ◽  
D.L. McNeil ◽  
G.D. Hill
Keyword(s):  
Ascochyta Blight ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Inheritance Of Resistance ◽  
Additive Effects ◽  
Foliar Resistance ◽  
Recessive Genes ◽  
The One ◽  
Moderate Resistance ◽  
Dominant Genes

Inheritance of foliar resistance to Ascochyta blight in lentil was studied using four resistant and one susceptible cultivars Two dominant genes one for resistance and one for moderate resistance are present in cv ILL 5588 One dominant gene which is allelic to the one for resistance in cv ILL 5588 confers the resistance in cv ILL 5684 One recessive gene is responsible for the resistance in cv Laird The resistance in cv Indian head is under control of two recessive genes with additive effects

The genetics of resistance to two strains of bean common mosaic virus in three cultivars of Phaseolus vulgaris L.

1980 ◽  
Vol 95 (3) ◽  
pp. 619-630 ◽  
Author(s):  
N. L. Innes ◽  
D. G. A. Walkey
Keyword(s):  
Mosaic Virus ◽  
Dominant Gene ◽  
Continuous Distribution ◽  
Recessive Gene ◽  
Distribution Patterns ◽  
Bean Common Mosaic Virus ◽  
Gene Model ◽  
Resistant Cultivars ◽  
High Level ◽  
Virus Strains

SUMMARYA high level of resistance to the bean common mosaic virus strains NL3 and NL4 when inoculated separately or together was confirmed in the cultivars Turkish Brown, Valja and 1750–73. Following crosses between the susceptible cv. The Prince and all three resistant cultivars, inoculation of F2 and F3 populations revealed that the cvs Turkish Brown and Valja each differed from The Prince in being homozygous for a major recessive gene conferring resistance to both NL3 and NL4. Homology tests indicated that the same gene was present in both Turkish Brown and Valja. Polygenes in Turkish Brown and Valja also appeared to confer some resistance to NL3, or environmental variation led to continuous distribution patterns in the F2's of resistant parents crossed with The Prince. Although a major recessive gene controlled resistance to NL3 in cv. 1750–73, it differed from that in the two other resistant cultivars. In addition, cv. 1750–73 carried a dominant gene determining reaction to the virus; probably the I gene originally found in Corbett Refugee. An attempt is made to relate these results to Drijfhout's (1978) gene-for-gene model. Using Drijfhout's gene nomenclature all the cultivars tested appear to carry the strain nonspecific gene bc-u. Further genetical tests will be necessary to determine with certainty which, if any, of Drijfhout's strain-specific resistant bc-genes are present in the three resistant cultivars studied here.

scholarly journals Inheritance of Resistance to the Watermelon Strain of Papaya Ringspot Virus in Watermelon

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 811C-811
Author(s):  
Nihat Guner* ◽  
Zvezdana Pesic-VanEsbroeck ◽  
Todd Wehner
Keyword(s):  
New Hampshire ◽  
Citrullus Lanatus ◽  
Recessive Gene ◽  
Germplasm Collection ◽  
Ringspot Virus ◽  
Inheritance Of Resistance ◽  
Papaya Ringspot Virus ◽  
Single Recessive Gene ◽  
Susceptible Parent ◽  
Sources Of Resistance

Sources of resistance to the watermelon strain of papaya ringspot virus (PRSV-W) have been identified within the watermelon (Citrullus lanatus) germplasm collection. Inheritance of resistance to papaya ringspot virus-watermelon strain was studied in three C. lanatus var. citroides accessions: PI 244017, PI 244019, and PI 485583. The susceptible parent lines `Allsweet', `Calhoun Gray', and `New Hampshire Midget' were crossed with resistant accessions to develop F1, F2, and BC1 generations for six families. A single recessive gene was found to control resistance to PRSV-W. The gene symbol `prv' is proposed for PRSV-W resistance in watermelon. Additional work is needed to determine whether the genes in PI 244017, PI 244019, and PI 485583 are allelic for resistance to PRSV-W.

scholarly journals New Sources of Lettuce Aphid Resistance in Lettuce

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1109A-1109
Author(s):  
James D. McCreight
Keyword(s):  
Insect Pest ◽  
Dominant Gene ◽  
The United States ◽  
Inheritance Of Resistance ◽  
Sources Of Resistance ◽  
Lactuca Virosa ◽  
Nasonovia Ribisnigri ◽  
Lactuca Serriola ◽  
Salinas Valley ◽  
Greenhouse Tests

Lettuce aphid (Nasonovia ribisnigri Mosley) is a recent insect pest to lettuce (Lactuca sativa L.) production in the United States. The single dominant gene, Nr, conditions resistance to the lettuce aphid in Lactuca virosa accession IVT280 from The Netherlands and is available in a limited number of commercial lettuce cultivars. New and genetically unique sources of resistance are sought to broaden the genetic base for resistance to the lettuce aphid. About 1200 lettuce PI lines were evaluated for resistance to lettuce aphid in greenhouse tests using a strain of lettuce aphid obtained from commercial lettuce in Salinas Valley, Calif. In 2002, plants were individually infested with five 24-hour nymphs per plant (controlled protocol), and the numbers of aphids per plant were counted 10–14 days post-infestation (dpi). Beginning in 2003, plants were mass-infested (mass protocol) with nymphs and alates of various ages and numbers. Using the mass protocol, the number of aphids per plant 10–14 dpi were estimated and categorized using a 1–5 scale where 1 = 0 aphids per plant, 2 = 1–10 aphids per plant, 3 = 11–20 aphids per plant, 4 = 21–30 aphids per plant, and 5 = >30 aphids per plant. `Salinas' and `Barcelona' were included as susceptible and resistant controls, respectively. Most of the accessions were susceptible. A few accessions had a few plants with very low numbers of aphids after repeated infestation, but their progeny were susceptible. Two accessions were highly resistant: PI 491093, a Lactuca serriola accession from Turkey, and PI 274378, a L. virosa accession from France. Inheritance of resistance in these two accessions and their allelism to Nr remains to be determined.

scholarly journals Inheritance of Resistance to the Peanut Root-knot Nematode in Capsicum chinense

2000 ◽  
Vol 125 (5) ◽  
pp. 615-618
Author(s):  
Richard L. Fery ◽  
Judy A. Thies
Keyword(s):  
Resistance Gene ◽  
Dominant Gene ◽  
Inheritance Of Resistance ◽  
Capsicum Chinense ◽  
Root Knot Nematode ◽  
Sources Of Resistance ◽  
Resistant Parent ◽  
Backcross Populations ◽  
Race 1 ◽  
Allelism Tests

Greenhouse experiments determined the inheritance of resistance to the peanut root-knot nematode [Meloidogyne arenaria (Neal) Chitwood race 1] in Capsicum chinense Jacq. germplasm lines PA-353 and PA-426. Evaluation of parental, F1, F2, and backcross populations of the crosses PA-353 × PA-350 and PA-426 × PA-350 (PA-350 is a susceptible cultigen) indicated that resistance in both C. chinense germplasm lines was conditioned by a single dominant gene. Evaluation of the F1 × resistant parent backcross populations in the cytoplasm of their respective resistant and susceptible parents indicated that the cytoplasm of the resistant parent is not needed for full expression of resistance. Allelism tests indicated that the dominant resistance gene in both PA-353 and PA-426 is allelic to a resistance gene in C. annuum L. `Carolina Cayenne'. However, these allelism tests did not demonstrate conclusively that the M. arenaria race 1 resistance gene in C. chinense is the N gene that conditions resistance to the southern root-knot nematode [Meloidogyne incognita (Kofoid & White) Chitwood] in C. annuum. The ease and reliability of evaluating plants for resistance to root-knot nematodes and the availability of simply inherited sources of resistance makes breeding for peanut root-knot nematode resistance a viable objective in C. chinense breeding programs.

scholarly journals Inheritance of resistance to soybean cyst nematode races 3 and 14 in soybean RIL and F2 populations

2007 ◽  
Vol 42 (12) ◽  
pp. 1735-1740 ◽  
Author(s):  
Marcia Flores da Silva ◽  
Ivan Schuster ◽  
Gerardo Domingo Lucio Cervigni ◽  
João Flávio Veloso da Silva ◽  
Waldir Pereira Dias ◽  
...  
Keyword(s):  
Soybean Cyst Nematode ◽  
Recombinant Inbred Lines ◽  
Recessive Gene ◽  
Inbred Lines ◽  
Cyst Nematode ◽  
Inheritance Of Resistance ◽  
Number Of Genes ◽  
Complete Resistance ◽  
Recessive Genes ◽  
Moderate Resistance

The objective of this work was to evaluate the soybean inheritance of resistance to cyst nematode races 3 and 14. The following populations where evaluated: one population of recombinant inbred lines (RILs) [Hartwig (resistant) x Y23 (susceptible line)] for races 3, 14 and 9; one population of families F2:3 [M-SOY 8001 (resistant) x MB/BR 46 - Conquista (susceptible)] for race 3; and one population of families F2:3 [(S5995 (resistant) x BRSMG Renascença (susceptible)] for race 14. In RIL populations, four epistatic genes were identified which conditioned resistance to race 14, and three epistatic ones for resistance to races 3 and 9. The lack of one gene provided moderate resistance under all situations. The highest number of genes for resistance to race 14 points out that genes responsible for lower effects might be involved. In population F2:3 from M-SOY 8001 x MB/BR 46 - Conquista, one recessive gene for moderate resistance and two recessive genes complete resistance to race 3 were identified. Two recessive genes conditioning moderate resistance to race 14 were identified in population F2:3 from the crossing S5995 x BRSMG Renascença. These results will be useful in designing crossings, involving these parentals, with higher possibility to accumulating genes that provide resistance to several SCN races.

INHERITANCE OF RESISTANCE TO FRUIT FLY IN WATERMELON

1978 ◽  
Vol 20 (1) ◽  
pp. 31-34 ◽  
Author(s):  
R. C. Khandelwal ◽  
Prem Nath
Keyword(s):  
Citrullus Lanatus ◽  
Dominant Gene ◽  
Fruit Fly ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Sources Of Resistance ◽  
Resistant Gene

Inheritance of resistance to the fruit fly Dacus cucurbitae Coq., was studied in intervarietal crosses of watermelon Citrullus lanatus (Thunb.) Mansf. Two sources of resistance J 18-1 and J 56-1 were used. The resistance of watermelon to the fruit fly was controlled by a single dominant gene. The symbol Fwr has been proposed to denote the resistant gene.

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