Resistance to Lettuce Infectious Yellows Virus in Melon

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 534b-534
Author(s):  
James D. McCreight
Keyword(s):  
Cucumis Melo ◽  
Dominant Gene ◽  
Field Tests ◽  
Single Dominant Gene ◽  
Limited Data ◽  
Sweetpotato Whitefly ◽  
Sources Of Resistance ◽  
Lettuce Infectious Yellows Virus ◽  
Greenhouse Tests

Yellowing of melon (Cucumis melo L.) incited by lettuce infectious yellows virus (LIYV) reduces yield and fruit quality of infected plants. LIYV is transmitted only by the sweetpotato whitefly (Bemisia tabaci Genn.). Two naturally infected field tests indicated several potential sources of resistance to LIYV. PI 124112 and `Snake Melon' had mild symptoms in both field tests whereas PI 313970 was asymptomatic in the test in which it was included. In greenhouse tests using controlled inoculation, PI 313970 was asymptomatic, had negative ELISA assays for LIYV, and was negative for LIYV in serial transfers to Chenopodium. `Top Mark' and `PMR 5' were symptomatic, had positive ELISA assays for LIYV, and were positive for LIYV in serial transfers to Chenopodium in these greenhouse tests. Limited data indicate that resistance in PI 313970 is conditioned by a single, dominant gene.

scholarly journals Inheritance of Resistance to Lettuce Infectious Yellows Virus in Melon

HortScience ◽  
2000 ◽  
Vol 35 (6) ◽  
pp. 1118-1120 ◽  
Author(s):  
James D. McCreight
Keyword(s):  
United States ◽  
Cucumis Melo ◽  
Field Tests ◽  
Plant Introduction ◽  
Inheritance Of Resistance ◽  
Dominant Allele ◽  
Sweetpotato Whitefly ◽  
Lettuce Infectious Yellows Virus ◽  
Desert Areas ◽  
Greenhouse Tests

Lettuce infectious yellows virus (LIYV), transmitted by the sweetpotato whitefly, (Bemisia tabaci Genn.), seriously affected melon (Cucumis melo L.) production in the lower desert areas of the southwest United States from 1981 through 1990. Melon plant introduction (PI) 313970 was previously found resistant to LIYV in naturally infected field tests and controlled-inoculation greenhouse tests. Data from F1 and segregating generations from crosses of PI 313970 with LIYV-susceptible lines indicated that resistance in this accession is conditioned by a dominant allele at a single locus designated Lettuce infectious yellows (Liy).

scholarly journals Genes for Resistance to Powdery Mildew Races 1 and 2U.S. in Melon PI 313970

HortScience ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. 591-594 ◽  
Author(s):  
James D. McCreight
Keyword(s):  
Powdery Mildew ◽  
Cucumis Melo ◽  
Powdery Mildew Resistance ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Sphaerotheca Fuliginea ◽  
Limited Data ◽  
Race 1 ◽  
Resistance Reaction ◽  
Greenhouse Tests

Powdery mildew is a major problem in melon (Cucumis melo L.) production worldwide. Three genes for resistance to Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll. race 1 and race 2U.S. were identified in growth chamber and greenhouse tests in the cross of PI 313970 × `Top Mark'. A recessive gene conditioned resistance of true leaves to race 1. A recessive gene appeared to condition resistance of cotyledons to race 2U.S., although a second recessive gene may be involved. A semi-dominant gene conditioned resistance of true leaves to race 2U.S. Limited data suggested linkage of the recessive gene for resistance to race 1 and the semi-dominant gene for resistance to race 2U.S. The resistance reaction of PI 313970 to infection of true leaves by race 2U.S. included water-soaked spots and resistant blisters, but segregation data for the resistant blister reaction were inconclusive. Allelic relationships of these genes with previously reported melon powdery mildew resistance genes remain to be determined.

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.

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.

scholarly journals Reaction of Cucurbit Species to Squash Leaf Curl Virus and Sweetpotato Whitefly

1991 ◽  
Vol 116 (1) ◽  
pp. 137-141 ◽  
Author(s):  
James D. McCreight ◽  
Albert N. Kishaba
Keyword(s):  
Virus Disease ◽  
Field Tests ◽  
Sweetpotato Whitefly ◽  
Squash Leaf Curl Virus ◽  
Benincasa Hispida ◽  
Leaf Curl Virus ◽  
Luffa Acutangula ◽  
Wild Taxon ◽  
Greenhouse Tests ◽  
Leaf Curl

Squash leaf curl (SLC) is a virus disease of squash transmitted by the sweetpotato whitefly [Bernisia tabaci (Germ.)]. 'Cucurbita maxima Duch. ex Lam., C. mixta Pang, and C. pepo L. cultivars and the wild taxon. C. texana Gray exhibited severe symptoms in response to SLC in greenhouse and field tests. Symptoms on C. moschata (Duch.) Duch. ex Poir. cultivars were much more severe in greenhouse tests than in field tests. Three wild species, C. ecuadorensis Cutler and Whitaker, C. lundelliana Bailey, and C. martinezii Bailey, were virtually immune in greenhouse tests, but were infected in field tests. Cucurbita foetidissima HBK expressed moderate symptoms in a field test. Benincasa hispida (Thunb.) Cogn., C. ficifolia Bouche, Lagenaria siceraria (Mol.) Standl., Luffa acutangula (L.) Roxb., Luffs aegyptiaca Mill., and Luffs graveolens Roxb. were resistant to SLC in greenhouse and field tests.

scholarly journals 521 PB 483 RESISTANCE TO EASTERN FILBERT BLIGHT IN CORYLUS SPECIES AND INTERSPECIFIC HYBRIDS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 506b-506
Author(s):  
Glare J. Coyne ◽  
Shawn A. Mehlenbacher
Keyword(s):  
New York ◽  
Interspecific Hybrid ◽  
Interspecific Hybrids ◽  
Dominant Gene ◽  
Single Dominant Gene ◽  
Sources Of Resistance ◽  
Anisogramma Anomala ◽  
Eastern Filbert Blight ◽  
Serious Disease ◽  
Kernel Traits

Eastern filbert blight (EFB) (Anisogramma anomala) is a serious disease of the European hazelnut (Coryls avellana). A single dominant gene for immunity to EFB from C. avellana `Gasaway' is being combined with good nut and kernel traits using a modified backcross approach. Additional sources of resistance would be highly desirable. Clones and seedlings of six other species (C. columa, C. comuta, C. heterophylla, C. sieboldiana, C. amencana, and C. jaquemontii] and a few interspecific hybrid selections were screened in the greenhouse to identify new sources of resistance. C. jacquemontii seedlings and C. columa clones were highly susceptible. C. comuta, C. hetemphylla, and C. sieboldiana clones were resistant, as were 86% of the C. americana seedlings tested. Five C. americana × C. avellana hybrids from New York were resistant under field conditions. One of four C. comuta × C. avellana and two of three C. hetemphylla × C. avellana hybrids were resistant.

scholarly journals Resistance to Gummy Stem Blight in Melon (Cucumis melo L.) Germplasm and Inheritance of Resistance from Plant Introductions 157076, 420145, and 323498

HortScience ◽  
2007 ◽  
Vol 42 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Joseph N. Wolukau ◽  
Xiao-Hui Zhou ◽  
Ying Li ◽  
Yong-Bin Zhang ◽  
Jin-Feng Chen
Keyword(s):  
Cucumis Melo ◽  
Dominant Gene ◽  
Plant Introduction ◽  
Didymella Bryoniae ◽  
Genetics Of Resistance ◽  
Sources Of Resistance ◽  
Resistant Parent ◽  
Plant Introductions ◽  
Stem Blight ◽  
Gummy Stem Blight

Gummy stem blight incited by the fungus Didymella bryoniae is a major disease of melons worldwide. The objectives of the present study were to critically evaluate melon (Cucumis melo L.) germplasm for resistance to D. bryoniae and to characterize the genetics of resistance in the resistant accessions. Two hundred sources of germplasm (plant introduction accessions, cultivars, breeding lines, landraces, and wild relatives) were screened against a single highly virulent isolate (IS25) of D. bryoniae in a plastic tunnel. The genetics of resistance to D. bryoniae was studied in three crosses between plant introductions 157076, 420145, and 323498, resistant parents that were fairly adapted (flowering, fruiting, powdery mildew tolerance) to Nanjing conditions, and plant introductions 268227, 136170, and NSL 30032 susceptible parents, respectively. Six populations of each cross (susceptible parent, resistant parent, F1, F2, the two reciprocal backcrosses) were analyzed for their responses to D. bryoniae. Seedlings in both studies were inoculated with a spore suspension (5 × 105 spores/mL−1) of D. bryoniae at the four to six true-leaf stages and assessed for leaf and stem damage at 7, 14, and 21 d postinoculation. Results of germplasm screening indicated most germplasms reported as resistant elsewhere were confirmed resistant under our conditions. However, some plant introductions identified as highly resistant elsewhere were susceptible under our conditions, the most interesting being plant introduction 482399. This plant introduction that was considered resistant was highly susceptible in our study. We also identified other sources of resistance not reported previously, for example, JF1; a wild Cucumis from the highlands of Kenya was rated highly resistant. Analysis of segregation of F1, F2, and backcross generations of the three crosses indicated that each of the three plant introductions carry a single dominant gene for resistance to the D. bryoniae.

Powdery mildew resistance in soybean PI 243540 is controlled by a single dominant gene

2010 ◽  
Vol 90 (6) ◽  
pp. 939-942 ◽  
Author(s):  
S.-T. Kang ◽  
M.A. Rouf Mian
Keyword(s):  
Powdery Mildew ◽  
Powdery Mildew Resistance ◽  
Dominant Gene ◽  
Genetic Resistance ◽  
Segregation Ratio ◽  
Common Disease ◽  
Growth Stages ◽  
Single Dominant Gene ◽  
Sources Of Resistance ◽  
Mildew Resistance

Powdery mildew (Microsphaera diffusa Cooke & Peck) is a common disease of soybean in many countries of the world, including the northern United States of America and parts of Canada. The genetic resistance of soybean to M. diffusa is known to be controlled by a single locus with three alleles designated as Rmd, Rmd-c and rmd. Identification and characterization of sources of resistance is a prerequisite for the development of resistant cultivars. The objective of this study was to determine the inheritance of powdery mildew resistance in a plant introduction (PI) from Japan, PI 243540. The inheritance of powdery mildew was determined in a segregating population from a cross between powdery mildew susceptible Ohio cultivar Wyandot and PI 243540. The parents and the progeny showed a consistent response to powdery mildew for all growth stages of plants. The two parents, the F1, F2, and F2:3 families from the cross were screened in a greenhouse and field following inoculation with M. diffusa. All F1 plants were resistant to M. diffusa and χ2 analysis for segregation in the population of 343 F2 plants indicated a tight fit for a 3:1 (P = 0.78) ratio, indicative of a single dominant gene. In the next generation, the 334 F2-derived families fit an expected 1 resistant:2 segregating:1 susceptible segregation ratio (P =0.88), which confirmed the results obtained in the F2 generation. Our results indicate that the powdery mildew resistance derived from PI 243540 is controlled by a single dominant gene linked to the Rmd/ Rmd-c/rmd locus. The simple inheritance of this gene should make it relatively easy to find linked DNA markers and transfer the gene to susceptible elite cultivars using the backcross breeding approach.

scholarly journals Resistanceto Cucurbit Leaf Crumple Virus in Melon

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1108E-1109 ◽  
Author(s):  
James D. McCreight ◽  
Hsing-Yeh Liu ◽  
Thomas A. Turini
Keyword(s):  
Sweet Potato ◽  
Cucumis Melo ◽  
Field Data ◽  
Field Tests ◽  
Squash Leaf Curl Virus ◽  
Biotype B ◽  
Leaf Curl Virus ◽  
Cucurbit Leaf Crumple Virus ◽  
Greenhouse Tests ◽  
Leaf Curl

Cucurbit leaf crumple geminivirus (CuLCrV) is transmitted by sweet-potato whitefly (Bemisia tabaci) biotype B (SPWF-B) and occurs on cucurbits in Arizona, California, Texas, and Mexico. This virus is identical to Cucurbit leaf curl virus, and their symptoms are similar to Squash leaf curl virus on squash (Cucurbita sp.) and Melonleaf curl virus on melon (Cucumis melo L.). Melon has been reported to be either susceptible to CuLCrV, or to have the ability to recover from infection. Twenty-three melon cultigens were inoculated with CuLCrV in greenhouse tests using SPWF-B. Eighteen of the cultigens tested were highly susceptible to CuLCrV (≥60% infected plants) and generally exhibited pronounced CuLCrV symptoms: `Amarillo', `Edisto 47', `Esteem', `Fuyu 3', `Impac', `Moscatel Grande', `Negro', `Perlita', PI 234607, PI 236355, PI 414723, `PMR 5', `Seminole', `Sol Dorado', `Sol Real', `Top Mark', `Vedrantais', and WMR 29. Five cultigens were resistant to CuLCrV (<40% infected plants that exhibited restricted, mild symptoms): MR-1, PI 124111, PI 124112, PI 179901, and PI 313970. Symptoms abated with time in both groups although infected plants remained positive for the virus. Ten of the cultigens (`Edisto 47', `Fuyu 3', `Impac', MR-1, PI 124112, PI 313970, PI 414723, `PMR 5', `Top Mark', and WMR 29) were included in field tests in 2003 and 2004 that were naturally infected with CuLCrV. With the exception of PI 414723, the greenhouse and field data were consistent for reaction to CuLCrV.

scholarly journals Tagging microsatellite marker to a blast resistance gene in the irrigated rice cultivar Cica-8

2012 ◽  
Vol 12 (3) ◽  
pp. 164-170 ◽  
Author(s):  
Thiago Martins Pinheiro ◽  
Leila Garcês de Araújo ◽  
Valácia Leme da Silva-Lobo ◽  
Anne Sitarama Prabhu ◽  
Marta Cristina de Filippi
Keyword(s):  
Microsatellite Markers ◽  
Blast Resistance ◽  
Dominant Gene ◽  
Rice Cultivar ◽  
Single Dominant Gene ◽  
Leaf Blast ◽  
Irrigated Rice ◽  
Blast Resistance Gene ◽  
Differential Reaction ◽  
Greenhouse Tests

The rice cultivar Cica-8 exhibit differential reaction to several pathotypes of Magnaporthe oryzae. The objective of the present investigation was to determine the number of alleles involved in the expression of resistance to leaf blast and identify microsatellite markers linked to these alleles. A cross between cultivar Metica-1 and Cica-8 susceptible and resistant, respectively, to pathotype IB-1 (Py1049) was made to obtain F1, F2, BC1:1 and BC1:2 progenies. Greenhouse tests for leaf blast reaction showed that resistance is controlled by a monogenic dominant gene. For testing microsatellite markers, DNA of both resistant and susceptible parents and F1 and F2 populations was extracted. As expected for single dominant gene the F2 populations segregated at a ratio of 3:1. Of the 11 microsatellite markers tested, one marker RM 7102 was found to be closely linked to the resistant allele at a distance of 2.7 cM, in the cultivar Cica-8 to pathotype IB-1.

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