Inheritance of resistance to potato virus Y in tomato

1988 ◽  
Vol 39 (3) ◽  
pp. 475 ◽  
Author(s):  
JE Thomas ◽  
DJ McGrath
Keyword(s):  
Potato Virus ◽  
Genetic Background ◽  
Potato Virus Y ◽  
Recessive Gene ◽  
Inheritance Of Resistance ◽  
Lycopersicon Hirsutum ◽  
Single Recessive Gene ◽  
Tomato Cultivar ◽  
Segregation Data ◽  
Susceptible Tomato

A line of Lycopersicon hirsutum (P.I. 247087) was resistant to iystemic infection by 10 isolates of potato virus Y (PVY) from Queensland. The inheritance of resistance to PVY was studied in crosses between a susceptible tomato cultivar (L. esculentum cv. Floradade) and P.I. 247087. Analysis of segregation data from PVY-inoculated parent lines, F1, F2 and backcross generations, supported the hypothesis that resistance is conferred by a single recessive gene. However, the effect of this gene was, in some generations, apparently modified by the highly susceptible genetic background of Floradade tomato. A backcrossing programme has commenced to incorporate this resistance into a commercially acceptable tomato cultivar.

scholarly journals Mutations in Potato virus Y Genome-Linked Protein Determine Virulence Toward Recessive Resistances in Capsicum annuum and Lycopersicon hirsutum

2004 ◽  
Vol 17 (3) ◽  
pp. 322-329 ◽  
Author(s):  
Benoît Moury ◽  
Caroline Morel ◽  
Elisabeth Johansen ◽  
Laurent Guilbaud ◽  
Sylvie Souche ◽  
...  
Keyword(s):  
Amino Acid ◽  
Capsicum Annuum ◽  
Potato Virus ◽  
Potato Virus Y ◽  
Cdna Clones ◽  
Lycopersicon Hirsutum ◽  
Potato Virus A ◽  
Single Nucleotide Change ◽  
Protein Encoding

The recessive resistance genes pot-1 and pvr2 in Lycopersicon hirsutum and Capsicum annuum, respectively, control Potato virus Y (PVY) accumulation in the inoculated leaves. Infectious cDNA molecules from two PVY isolates differing in their virulence toward these resistances were obtained using two different strategies. Chimeras constructed with these cDNA clones showed that a single nucleotide change corresponding to an amino acid substitution (Arg119His) in the central part of the viral protein genome-linked (VPg) was involved in virulence toward the pot-1 resistance. On the other hand, 15 nucleotide changes corresponding to five putative amino acid differences in the same region of the VPg affected virulence toward the pvr21 and pvr22 resistances. Substitution models identified six and five codons within the central and C terminal parts of the VPg for PVY and for the related potyvirus Potato virus A, respectively, which undergo positive selection. This suggests that the role of the VPg-encoding region is determined by the protein and not by the viral RNA apart from its protein-encoding capacity.

scholarly journals Antibiosis to Beet Armyworm (Spodoptera exigua) in Lycopersicon Accessions

HortScience ◽  
1993 ◽  
Vol 28 (9) ◽  
pp. 932-934 ◽  
Author(s):  
Sanford D. Eigenbrode ◽  
John T. Trumble
Keyword(s):  
Spodoptera Exigua ◽  
Leaf Surface ◽  
Glandular Trichomes ◽  
Beet Armyworm ◽  
Lycopersicon Hirsutum ◽  
Tomato Cultivar ◽  
Type Iv ◽  
Leaf Surfaces ◽  
Susceptible Tomato ◽  
Neonate Larvae

Four accessions of Lycopersicon hirsutum f. glabratum Mull. and eight accessions of L. hirsutum f. typicum Humb. & Bonpl. were evaluated for their resistance to the beet armyworm [Spodoptera exigua (Hübner)]. Survival of S. exigua neonate larvae for up to 96 hours on foliage of all these accessions differed significantly from their survival on a susceptible tomato cultivar. Spodoptera exigua survival did not differ significantly between the two forms of L. hirsutum. Antibiosis to S. exigua in L. hirsutum f. glabratum appears similar to the levels found to other Lepidoptera. Accessions of L. hirsutum f. typicum included the very susceptible PI 199381 and the two most resistant accessions, LA 2329 and LA 1777. Insect resistance had not been reported previously in four of the L. hirsutum f. typicum accessions. Spodoptera exigua survival was significantly negatively correlated with the density of type IV glandular trichomes on the leaf surfaces, calculated across all 12 accessions. This relationship did not occur within L. hirsutum f. glabratumor L. hirsutum f. typicum accessions, nor was it significant if PI 199381 was excluded from the analysis. Leaf-surface exudates of L. hirsutum f. glabratum accessions were dominated by the methylketones 2-undecanone and 2-tridecanone. Leaf-surface exudates of L. hirsutum f. typicum were dominated by three sesquiterpenes-zingiberene, δ elemene, and γ elemene. Resistance was not correlated with the amounts of these specific compounds within or across botanical form. Spodoptera exigua survival in L. hirsutum f. typicum (excluding PI 199381) correlated negatively with the total estimated amount of leaf-surface volatiles extracted. PI 199381 may be useful as a susceptible parent for intraspecific crosses to examine S. exigua resistance in L. hirsutum.

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 (11) Inheritance of Resistance to Zucchini Yellow Mosaic Virus-Florida Strain in Watermelon

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1039E-1039
Author(s):  
Nihat Guner ◽  
Todd C. Wehner
Keyword(s):  
Mosaic Virus ◽  
New Hampshire ◽  
Zucchini Yellow Mosaic Virus ◽  
Recessive Gene ◽  
Yellow Mosaic Virus ◽  
Inheritance Of Resistance ◽  
Single Recessive Gene ◽  
Leaf Stage ◽  
True Leaf ◽  
Severe Isolate

Inheritance of resistance to zucchini yellow mosaic virus-Florida strain (ZYMV-FL) was studied in the resistant watermelon accession of PI 595203 (Citrulluslanatus var. lanatus), an egusi type originally collected in Nigeria. The F1, F2, and BC1 generations derived from the cross `Calhoun Gray' × PI 595203 and `New Hampshire Midget' × 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 on a 0 to 9 scale, based on the severity of virus symptoms. A single recessive gene was found to control resistance, for which we propose the symbol zym-FL2. The gene probably was not allelic to the previously published gene, zym-FL, for resistance to the Florida strain of ZYMV in the accession PI 482261, since PI 482261 was not resistant to the ZYMV-FL isolate used in our tests.

Genetic analysis of resistance to bacterial blight in rice

Genome ◽  
1988 ◽  
Vol 30 (3) ◽  
pp. 299-302 ◽  
Author(s):  
S. C. Prasad ◽  
J. B. Tomar
Keyword(s):  
Resistance Genes ◽  
Bacterial Blight ◽  
Xanthomonas Campestris ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Susceptible Cultivar ◽  
Inheritance Of Resistance ◽  
Single Recessive Gene ◽  
Clipping Technique ◽  
Mode Of Inheritance

The mode of inheritance of resistance to bacterial blight, Xanthomonas campestris pv. Oryzae was studied in 12 rice cultivars: 'BR51-282-8', 'DV85', 'CAS209', 'Java14', 'IR4613-54-5', 'Zenith', 'IR36', 'Neuli', 'BJ1', 'LZN', 'MRC603-303', and 'D204-1'. These resistance cultivars were crossed with a susceptible tester parent 'TN1'. The plants were inoculated at the maximum tillering stage by the clipping technique. From the reactions of F1, F2, and F3 populations, it was found that resistance in 'LZN', 'MRC603-303', and 'D204-1' was conditioned by a single recessive gene. The resistance in 'BR51-282-8', 'DV85', 'CAS209', 'Javal4', 'IR4613-54-5', 'Zenith', 'IR36', 'Neuli', and 'BJ1' was controlled by a single dominant gene. The allelic relationships of resistance genes in the test cultivars with Xa4 was studied. The Xa4 gene was originally identified and designated in 'IR22'. The resistance genes in the test cultivars were nonallelic to Xa4. The trisomie lines of 'IR36' were crossed with 'Jaya', a highly susceptible cultivar to bacterial blight. The segregation pattern of the F2 and backcross generations revealed that the resistance gene of 'IR36' was located on chromosome 12 of the rice genome.Key words: rice, resistance, bacterial blight, allelic relationship, trisomics.

scholarly journals Genetical and embryological studies of the jt form of syndactylism in the mouse

1966 ◽  
Vol 8 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Elizabeth M. Center
Keyword(s):  
Genetic Background ◽  
Soft Tissues ◽  
Unsolved Problem ◽  
Recessive Gene ◽  
Single Recessive Gene ◽  
Swiss Albino Mice ◽  
Albino Mice ◽  
Distal Direction

1. A form of syndactylism (jt) involving two or three digits on one or more feet has been found in the descendants of Swiss-albino mice treated with HN2. The fusions are in a proximo-distal direction and usually involve only the skin and soft tissues; digits 1 and 5 are unaffected.2. This type of syndactylism is apparently due to a single recessive gene, jt, whose penetrance is influenced by ‘genetic background’. Apparently the identical mutation has occurred independently in stock maintained at Bar Harbor and Stanford. Linkage tests indicate that jt is not linked with c or lu.3. Embryological studies of the developing footplate reveal a loss in both preaxial and postaxial footplate tissue, primarily the latter, prior to and during the condensation of mesenchyme into the precartilage of the digital elements in the jt/jt limb.4. The importance of the shape and amount of footplate tissue to the resultant morphology of the foot is apparent. It is evident that genes such as jt are responsible for changes in footplate development, but the immediate underlying factors which cause these alterations remain an unsolved problem.

scholarly journals Inheritance of the Partly Colored Seedcoat Pattern, Bipunctata, in Common Bean

1996 ◽  
Vol 121 (6) ◽  
pp. 1032-1034 ◽  
Author(s):  
Mark J. Bassett
Keyword(s):  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Genetic Background ◽  
Recessive Gene ◽  
Recurrent Parent ◽  
Single Recessive Gene ◽  
Complete Dominance ◽  
The Cross

The development of genetic tester stocks in common bean (Phaseolus vulgaris L.) for the partly colored seedcoat patterns `bipunctata BC3 5-593' (t z bip) and `virgarcus BC3 5-593' (t z) was described. The inheritance of the bipunctata pattern was studied in the F2 from the crosses `bipunctata BC1 5-593' × 5-593 and `bipunctata BC2 5-593' × 5-593. The data supported the hypothesis that a single recessive gene (bip) converts virgarcus (t z Bip) to bipunctata (t z bip). The inheritance of bipunctata was also studied in the F2 from the cross `bipunctata BC3 5-593' × `virgarcus BC3 5-593'. The data supported the hypothesis of complete dominance of Bip over bip in a t z genetic background highly related to the recurrent parent 5-593, where only the parental phenotypes appear in the F2.

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.

Evaluation and inheritance of the Lycopersicon hirsutum resistance against potato virus Y

Euphytica ◽  
1995 ◽  
Vol 86 (3) ◽  
pp. 219-226
Author(s):  
R. Legnani ◽  
K. Gebre Selassie ◽  
R. Nono Womdim ◽  
P. Gognalons ◽  
A. Moretti ◽  
...  
Keyword(s):  
Potato Virus ◽  
Potato Virus Y ◽  
Lycopersicon Hirsutum
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