Novel phytophthora resistant catharanthus roseus plant

a technology of catharanthus roseus and resistant plants, applied in the field of catharanthus roseus plants, can solve the problems of inability to cure plants infected with this pathogen, blight on the stem and foliage, root rot, etc., and achieve the effect of broad spectrum genetic resistan

Inactive Publication Date: 2018-01-11
SYNGENTA PARTICIPATIONS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]There is also provided seed containing a broad spectrum genetic resistance to Phytophthora produced from said hybrid plant of the present invention.
[0016]There is also provided viable Catharanthus seed deposited under NCIMB Accession No. 42348 and plants grown from said deposited seed and the progeny thereof, wherein the progeny contain the broad spectrum genetic resistance to Phytophthora.

Problems solved by technology

e presence of P. nicotianae routinely causes stem and foliage blight, and occasionally may cause root rot. <
Plants infected with that pathogen cannot be cured and normally die.
Plantings of C. roseus often have 100% mortality if P. nicotianae is present.

Method used

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  • Novel phytophthora resistant catharanthus roseus plant
  • Novel phytophthora resistant catharanthus roseus plant
  • Novel phytophthora resistant catharanthus roseus plant

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062]Resistance Breeding

[0063]The Cora series of C. roseus was introduced as resistant to P. nicotianae, but several instances of susceptibility to this pathogen were noted (Jeffers and Meadows, 2011). Consequently, three cultivars of C.

[0064]roseus, two resistant (Cora Lavender, Cora Burgundy) and one susceptible (Titan Blush), were used to evaluate the virulence of 40 isolates of P. nicotianae that had been recovered from C. roseus over a 13-year period including four isolates from diseased Cora plants. All isolates also were tested for mating type and sensitivity to mefenoxam. Isolates varied significantly in virulence, cultivars varied significantly in susceptibility, and there was a significant isolate-by-cultivar interaction indicating that isolates affected cultivars differentially. Isolates were separated into three virulence groups: weakly, moderately, and highly virulent. Nine weakly virulent isolates caused little disease on any of the plants, and 21 moderately virulent ...

example 2

[0069]Ascertainment of Virulence Groups

[0070]The following cultivars were used in the study: Cultivar A (FD0922); Cultivar B (Cora Lavender); Cultivar C (Cora Cascade Cherry); and Cultivar D (Sunstorm Deep Pink—susceptible control).

[0071]The objective of the field trial was to determine if the four genotypes of annual Vinca were susceptible to isolates of P. nicotianae that are virulent to Cora plants.

[0072]There were 6 plants of each of 2 genotypes per container. This represented 12 plants / container and 18 plants / genotype×isolate combination

[0073]Table 1 below shows the container number, together with the genotypes / replicate and corresponding treatments 1 to 5.

TABLE 1Cont#Cultivar / RepTreatment1A1 / C212B3 / D243A1 / D254B2 / C145A3 / B126B3 / D217A1 / B238A1 / C329A2 / D3410C2 / D1511B1 / C3312C2 / D1213B1 / C2414A2 / D3215A3 / B1516A3 / D1417B2 / C1218C1 / D3319A3 / D3120C1 / D3521B3 / D2222A1 / C3423A2 / B1124D1 / C3125A2 / C2326A2 / B3527B2 / C1128B3 / D2329A3 / D1330B2 / C35

[0074]An established field plot was used to evaluate four genot...

example 3

[0101]Symptom Severity

[0102]The symptom severity at 50 DAI (50 days after infection) are shown in Tables 3 to 5: All four cultivars differed in disease severity with Cultivar A (FD0922) being least susceptible by far with plants showing only 18.2% of tissue with symptoms, and Cultivar D (Sunstorm Deep Pink) most susceptible (plants were 79.8% symptomatic). Treatments 3, 2, and 1 were most virulent.

[0103]Table 3 is a 2-way ANOVA of symptom severity (%) at 50 days after inoculation. The effects of five inoculum treatments on four cultivars of annual vinca are shown

TABLE 3SourcedfF ratioProb > FInoculum treatments4421.7Cultivars3490.1Treatment *Cultivar interaction1271.9

[0104]Table 4 shows the differences among CULTIVARS with means separated by Fisher's protected least significant difference with P=0.05

TABLE 4MeanCultivarMeanseparationD (Sunstorm Deep Pink)79.8AC (Cora Cascade Cherry)60.8BB (Cora Lavender)48.7CA (FD0922)18.2D

[0105]Table 5 shows the differences among TREATMENTS with mea...

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Abstract

The present invention relates to plants of the genus Catharanthus containing a broad spectrum genetic resistance to Phytophthora. In particular, the present invention relates to a Catharanthus roseus plant containing a broad spectrum genetic resistance to P. nicotianae.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a Catharanthus roseus plant having a novel broad spectrum Phytophthora nicotianae resistant phenotype.INTRODUCTION[0002]Catharanthus roseus, known formerly as Vinca rosea is a main source of vinca alkaloids, now sometimes called Catharanthus alkaloids. There are about 130 of these compounds, including vincristine and vinblastine, common drugs used to treat cancer.[0003]Catharanthus roseus is also cultivated as an ornamental plant in gardens. Several cultivars have been bred to produce flowers in many shades of pink, red, lilac, and white, or in light shades with dark eyes.[0004]Catharanthus roseus (L.) G. Don (Madagascar periwinkle or annual C. roseus) has high levels of susceptibility to the plant pathogen Phytophthora nicotianae Breda de Haan (aerial Phytophthora). The presence of P. nicotianae routinely causes stem and foliage blight, and occasionally may cause root rot. P. nicotianae is one of the most economically imp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01H5/02A01H1/02
CPCA01H5/02A01H1/02A01H6/084A01H1/1245
Inventor HERSHBERGER, AMANDAGAWENDA, INKATHOMAS, DARRYLTROLINGER, JANEDE LA FUENTE VAN BENTEM, SERGIOLEE, JAEMIN
Owner SYNGENTA PARTICIPATIONS AG
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