Indian cucumber germplasm and challenges ahead

Sharma, B. D.; Hore, D. K.

doi:10.1007/bf00126935

Cited by 11 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although these botanical varieties are cross-compatible and var. hardwickii possesses several economically important traits (e.g., multiple and sequential fruiting habit [35] ; downy mildew resistance [36] ; root-knot nematode resistance [37] ; cucumber mosaic virus [38] ), their introgression into elite commercial germplasm has been difficult. If genes controlling such traits are located in the regions with chromosomal variation, then fixation of positive alleles in commercial types would likely be complicated.…”

Section: Discussionmentioning

confidence: 99%

An Integrated Genetic and Cytogenetic Map of the Cucumber Genome

et al. 2009

View full text Add to dashboard Cite

The Cucurbitaceae includes important crops such as cucumber, melon, watermelon, squash and pumpkin. However, few genetic and genomic resources are available for plant improvement. Some cucurbit species such as cucumber have a narrow genetic base, which impedes construction of saturated molecular linkage maps. We report herein the development of highly polymorphic simple sequence repeat (SSR) markers originated from whole genome shotgun sequencing and the subsequent construction of a high-density genetic linkage map. This map includes 995 SSRs in seven linkage groups which spans in total 573 cM, and defines ∼680 recombination breakpoints with an average of 0.58 cM between two markers. These linkage groups were then assigned to seven corresponding chromosomes using fluorescent in situ hybridization (FISH). FISH assays also revealed a chromosomal inversion between Cucumis subspecies [C. sativus var. sativus L. and var. hardwickii (R.) Alef], which resulted in marker clustering on the genetic map. A quarter of the mapped markers showed relatively high polymorphism levels among 11 inbred lines of cucumber. Among the 995 markers, 49%, 26% and 22% were conserved in melon, watermelon and pumpkin, respectively. This map will facilitate whole genome sequencing, positional cloning, and molecular breeding in cucumber, and enable the integration of knowledge of gene and trait in cucurbits.

show abstract

Section: Discussionmentioning

confidence: 99%

An Integrated Genetic and Cytogenetic Map of the Cucumber Genome

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Compared to these resistance sources, Cucumis sativus var. hardwickii is also reported to offer resistance to downy mildew (Sharma and Hore 1996) and root-knot nematodes (Walters et al 1999) along with multiple and sequential fruiting habit (Host and Lower 1978). Thus this species is a valuable genetic source for the improvement of multiple traits in cucumber.…”

Section: Inheritance Of CMV Resistancementioning

confidence: 95%

“…hardwickii R. Alef. a native of Sub-Himalayan region and considered to be the wild progenitor of cucumber (Deakin et al 1971) has been reported to possess resistance to downy mildew (Sharma and Hore 1996) and root-knot nematodes (Walters et al 1999) apart from possessing multiple and sequential fruiting habit (Horst and Lower 1978). However, utilization of this species as a resistant source against CMV and the genetics of its resistance have not been reported so far.…”

Section: Introductionmentioning

confidence: 98%

Genetics of resistance to Cucumber mosaic virus in Cucumis sativus var. hardwickii R. Alef

et al. 2008

View full text Add to dashboard Cite

The genetics of resistance to Cucumber mosaic virus (CMV) in Cucumis sativus var. hardwickii R. Alef, the wild progenitor of cultivated cucumber was assessed by challenge inoculation and by natural infection of CMV. Among the 31 genotypes of C. sativus var. hardwickii collected from 21 locations in India the lowest mean percent disease intensity (PDI) was recorded in IC-277048 (6.33%) while the highest PDI was observed in IC-331631 (75.33%). All the four cultivated varieties (DC-1, DC-2, CHC-1 and CHC-2) showed very high PDI and susceptible disease reaction. Based on mean PDI, 8 genotypes were categorized as resistant, 13 as moderately resistant, 9 as moderately susceptible and one as susceptible. A chi-square test of frequency distribution based on mean PDI in F 2 progenies of six resistant 9 susceptible crosses revealed monogenic recessive Mendelian ratio 1(R):3(S) to be the best fit. This monogenic recessive model was further confirmed by 1(R):1(S) ratio as the best fit for back cross with resistant parent and no fit for either 3:1 or 1:1 in the back cross with the susceptible parent. The results revealed that CMV resistance in C. sativus var. hardwickii was controlled by a single recessive gene. Considering the cross compatibility between C. sativus var. hardwickii and cultivated cucumber, the resistance trait can be easily transferred to cultivated species through simple backcross breeding.

show abstract

“…agrestis (Naud.) Pangalo are also reported to possess drought tolerance (Sharma and Hore 1996). Therefore, further characterization of these accessions with respect to various traits of economic importance will help in validating the sources of useful genes in improvement of cucumber and muskmelon.…”

Section: Germplasm Conservation and Potential Usesmentioning

confidence: 99%

“…hardwickii (Royle) Alef., has both multiple lateral branching and sequential fruiting characters and has shown potential for increasing fruit yields in C. sativus. Besides this, it is also a valuable source for different characters such as resistance to cucumber green mottle mosaic virus (Sharma and Hore 1996), root-knot nematode (Walters et al 1997), downy mildew and scab diseases (Staub and Palmer 1987). C. prophetarum is reported to be resistant to powdery mildew, corky-root (Pitrat and de Vaulx 1979), root-knot nematode (Sharma and Hore 1996) and cucumber vein yellowing virus (Marco et al 2003).…”

Section: Germplasm Conservation and Potential Usesmentioning

confidence: 99%

Distribution and extent of diversity in Cucumis species in the Aravalli ranges of India

Dwivedi

Dhariwal

Krishnan

et al. 2009

Genet Resour Crop Evol

View full text Add to dashboard Cite

Among the 52 species reported in Cucumis, cucumber and muskmelon are the most important species, extensively cultivated by the human for consumption. Diversity has been reported in the wild species of Cucumis from India. Considering the status of genetic erosion of the variability in the various species of Cucumis, a total of 121 germplasm accessions of five different Cucumis species were collected through three explorations in the parts of Aravalli ranges of northwestern India. The paper presents the distribution, collection, extent of variability, associated indigenous traditional knowledge, conservation status of these Cucumis species and prospects of their utilization in crop improvement.

show abstract

Indian cucumber germplasm and challenges ahead

Cited by 11 publications

References 2 publications

An Integrated Genetic and Cytogenetic Map of the Cucumber Genome

An Integrated Genetic and Cytogenetic Map of the Cucumber Genome

Genetics of resistance to Cucumber mosaic virus in Cucumis sativus var. hardwickii R. Alef

Distribution and extent of diversity in Cucumis species in the Aravalli ranges of India

Contact Info

Product

Resources

About