Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>)
Downy mildew caused by the oomycete <i>Pseudoperonospora cubensis</i> is a devastating disease of cucurbits. Cucumis species are attacked by pathotype 3 (clade 2) of the pathogen, while Cucurbita species are attacked by pathotype 6 (clade 1). The Sikkim-type cucumbers PI 197088 and PI 33...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
|
| Series: | Seeds |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2674-1024/4/1/8 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850088288920010752 |
|---|---|
| author | Rivka S. Hammer Yigal Cohen |
| author_facet | Rivka S. Hammer Yigal Cohen |
| author_sort | Rivka S. Hammer |
| collection | DOAJ |
| description | Downy mildew caused by the oomycete <i>Pseudoperonospora cubensis</i> is a devastating disease of cucurbits. Cucumis species are attacked by pathotype 3 (clade 2) of the pathogen, while Cucurbita species are attacked by pathotype 6 (clade 1). The Sikkim-type cucumbers PI 197088 and PI 330628 express high levels of resistance against both pathotypes (clades) of the pathogen but no green-fruit cucumber cultivars resistant to the disease are available on the market. Here we report on several non-Sikkim accessions of cucumber that show resistance against downy mildew in four consecutive seasons. Mean % foliage attacked with downy mildew in the susceptible controls Ilan and SMR-18 was 93% and 71%, respectively, as against 0.2% and 1.8% in the Sikkim-type resistant controls PI 197088 and PI 330628, respectively. Twenty-four green fruit accessions were significantly more resistant than the susceptible cucumber controls. Five accessions showed less than 10% infected leaf area with downy mildew as follows: PI 432870—5%, PI 390266—7.5%, PI 418964—8.5%, PI 390258—8.8%, and G12—10%. PI 390258 and PI 390266 were susceptible to race 1 of powdery mildew but resistant to race 2, whereas PI 418964 was resistant to both races. These accessions may be used in breeding programs to accelerate the production of green-fruit, disease-resistant cucumbers. |
| format | Article |
| id | doaj-art-b5ffeb3d91c24b3e96c3414fd7bc8748 |
| institution | DOAJ |
| issn | 2674-1024 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Seeds |
| spelling | doaj-art-b5ffeb3d91c24b3e96c3414fd7bc87482025-08-20T02:43:03ZengMDPI AGSeeds2674-10242025-02-0141810.3390/seeds4010008Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>)Rivka S. Hammer0Yigal Cohen1Faculty of Life Sciences, Bar Ilan University, Ramat Gan 5290002, IsraelFaculty of Life Sciences, Bar Ilan University, Ramat Gan 5290002, IsraelDowny mildew caused by the oomycete <i>Pseudoperonospora cubensis</i> is a devastating disease of cucurbits. Cucumis species are attacked by pathotype 3 (clade 2) of the pathogen, while Cucurbita species are attacked by pathotype 6 (clade 1). The Sikkim-type cucumbers PI 197088 and PI 330628 express high levels of resistance against both pathotypes (clades) of the pathogen but no green-fruit cucumber cultivars resistant to the disease are available on the market. Here we report on several non-Sikkim accessions of cucumber that show resistance against downy mildew in four consecutive seasons. Mean % foliage attacked with downy mildew in the susceptible controls Ilan and SMR-18 was 93% and 71%, respectively, as against 0.2% and 1.8% in the Sikkim-type resistant controls PI 197088 and PI 330628, respectively. Twenty-four green fruit accessions were significantly more resistant than the susceptible cucumber controls. Five accessions showed less than 10% infected leaf area with downy mildew as follows: PI 432870—5%, PI 390266—7.5%, PI 418964—8.5%, PI 390258—8.8%, and G12—10%. PI 390258 and PI 390266 were susceptible to race 1 of powdery mildew but resistant to race 2, whereas PI 418964 was resistant to both races. These accessions may be used in breeding programs to accelerate the production of green-fruit, disease-resistant cucumbers.https://www.mdpi.com/2674-1024/4/1/8cucurbitsgenes for resistancedowny mildewpowdery mildewPI plant introduction<i>Podospheara xanthi</i> |
| spellingShingle | Rivka S. Hammer Yigal Cohen Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) Seeds cucurbits genes for resistance downy mildew powdery mildew PI plant introduction <i>Podospheara xanthi</i> |
| title | Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) |
| title_full | Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) |
| title_fullStr | Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) |
| title_full_unstemmed | Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) |
| title_short | Non-Sikkim Cucumber Accessions Resistant to Downy Mildew (<i>Pseudoperonospora cubensis</i>) |
| title_sort | non sikkim cucumber accessions resistant to downy mildew i pseudoperonospora cubensis i |
| topic | cucurbits genes for resistance downy mildew powdery mildew PI plant introduction <i>Podospheara xanthi</i> |
| url | https://www.mdpi.com/2674-1024/4/1/8 |
| work_keys_str_mv | AT rivkashammer nonsikkimcucumberaccessionsresistanttodownymildewipseudoperonosporacubensisi AT yigalcohen nonsikkimcucumberaccessionsresistanttodownymildewipseudoperonosporacubensisi |