scholarly journals RESISTANCE OF WILD LETTUCE (LACTUCA SALIGNA L.) TO LETTUCE INFECTIOUS YELLOWS VIRUS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1163G-1163
Author(s):  
Valerie Haley ◽  
James D. McCreight
Keyword(s):  
Lactuca Sativa ◽  
Wild Lettuce ◽  
Abnormal Growth ◽  
Lactuca Saligna ◽  
Potential Value ◽  
Lettuce Infectious Yellows Virus

Segregating generations from crosses of cultivated lettuce (Lactuca sativa L.) with wild lettuce (L. saligna L.) are affected by sterility and abnormal growth. Resistance to lettuce infectious yellows virus (LIYV) was, therefore, studied in crosses of previously reported LIYV-resistant (PI 261653) with LIYV-susceptible (PI 490999, PI 491000 and PI 491001) L. saligna accessions. Simple Mendelian ratios for resistance (measured as numbers of symptomless and symptomatic plants, and as number of symptomatic leaves per plant) to LIYV were not evident. PI 491001 had the fewest symptomatic plants and the fewest symptomatic leaves per plant. The potential value of L. saligna for development of LIYV-resistant cultivated lettuce will be discussed.

scholarly journals RESISTANCE OF WILD LETTUCE (LACTUCA SALIGNA L.) TO LETTUCE INFECTIOUS YELLOWS VIRUS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1163g-1163 ◽  
Author(s):  
Valerie Haley ◽  
James D. McCreight
Keyword(s):  
Lactuca Sativa ◽  
Wild Lettuce ◽  
Abnormal Growth ◽  
Lactuca Saligna ◽  
Potential Value ◽  
Lettuce Infectious Yellows Virus

Segregating generations from crosses of cultivated lettuce (Lactuca sativa L.) with wild lettuce (L. saligna L.) are affected by sterility and abnormal growth. Resistance to lettuce infectious yellows virus (LIYV) was, therefore, studied in crosses of previously reported LIYV-resistant (PI 261653) with LIYV-susceptible (PI 490999, PI 491000 and PI 491001) L. saligna accessions. Simple Mendelian ratios for resistance (measured as numbers of symptomless and symptomatic plants, and as number of symptomatic leaves per plant) to LIYV were not evident. PI 491001 had the fewest symptomatic plants and the fewest symptomatic leaves per plant. The potential value of L. saligna for development of LIYV-resistant cultivated lettuce will be discussed.

scholarly journals Sequence of the Mitochondrial Genome of Lactuca virosa Suggests an Unexpected Role in Lactuca sativa’s Evolution

2021 ◽  
Vol 12 ◽  
Author(s):  
Arnaud Fertet ◽  
Stéfanie Graindorge ◽  
Sandrine Koechler ◽  
Gert-Jan de Boer ◽  
Emilie Guilloteau-Fonteny ◽  
...  
Keyword(s):  
Mitochondrial Genome ◽  
Lactuca Sativa ◽  
Wild Species ◽  
The Other ◽  
Intraspecies Variation ◽  
Lactuca Saligna ◽  
Lactuca Virosa ◽  
Lactuca Serriola ◽  
Direct Ancestor

The involvement of the different Lactuca species in the domestication and diversification of cultivated lettuce is not totally understood. Lactuca serriola is considered as the direct ancestor and the closest relative to Lactuca sativa, while the other wild species that can be crossed with L. sativa, Lactuca virosa, and Lactuca saligna, would have just contributed to the latter diversification of cultivated typologies. To contribute to the study of Lactuca evolution, we assembled the mtDNA genomes of nine Lactuca spp. accessions, among them three from L. virosa, whose mtDNA had not been studied so far. Our results unveiled little to no intraspecies variation among Lactuca species, with the exception of L. serriola where the accessions we sequenced diverge significantly from the mtDNA of a L. serriola accession already reported. Furthermore, we found a remarkable phylogenetic closeness between the mtDNA of L. sativa and the mtDNA of L. virosa, contrasting to the L. serriola origin of the nuclear and plastidial genomes. These results suggest that a cross between L. virosa and the ancestor of cultivated lettuce is at the origin of the actual mitochondrial genome of L. sativa.

WEEDS AS RESERVOIR HOSTS OF THE LETTUCE BIG-VEIN VIRUS

1965 ◽  
Vol 43 (9) ◽  
pp. 1141-1149 ◽  
Author(s):  
R. N. Campbell
Keyword(s):  
Lactuca Sativa ◽  
Taraxacum Officinale ◽  
Physiological Strain ◽  
Lactuca Saligna ◽  
Sonchus Oleraceus ◽  
Sacramento Valley ◽  
Distinct Virus ◽  
Lactuca Virosa ◽  
Lactuca Sativa L ◽  
Reservoir Hosts

The lettuce big-vein virus (BVV) was recovered from 2 of 23 lettuce plants (Lactuca sativa L.) and 2 of 24 sow thistle (Sonchus oleraceus L.) plants sampled in 1962 and 1963 in areas of the lower Sacramento Valley where lettuce had not previously been grown. BVV is considered to be an indigenous virus of plant species in the Compositae family; these apparently are symptomless hosts and the presence of BVV is noted only when lettuce is planted under favorable environmental conditions. A BVV-Olpidium isolate from sow thistle was shown to be a physiological strain differing from the lettuce isolate in transmitting BVV to sow thistle and multiplying well in sow thistle roots. In addition, the susceptibility of Lactuca spp., Cichorium spp., and Taraxacum officinale to BVV-lettuce Olpidium was tested; only Laciuca serriola, Lactuca saligna, Cichorium sp., and a sow thistle from Japan showed good symptoms, Lactuca gracoglossum and Lactuca virosa showed symptoms poorly. Of the symptomless species, Olpidium and BVV were recovered from Lactuca muralis, T. officinale, and chicory (cv. asparagus) but not from endive (cv. No. 5) or chicory (cv. Large rooted). Sow thistle yellow-vein virus produces symptoms suggestive of big vein in sow thistle but its identity as a distinct virus transmitted by Nasonovia lactucae (L.) was confirmed.

Plant regeneration from protoplasts of a wild lettuce species (Lactuca saligna L.)

1987 ◽  
Vol 6 (3) ◽  
pp. 180-182 ◽  
Author(s):  
C. Brown ◽  
J. A. Lucas ◽  
J. B. Power
Keyword(s):  
Plant Regeneration ◽  
Wild Lettuce ◽  
Lactuca Saligna

The application of electron microscopy to diagnosis in gynecologic neoplasms and tumor-like conditions

1984 ◽  
Vol 42 ◽  
pp. 102-105
Author(s):  
Lawrence M. Roth
Keyword(s):  
Electron Microscopy ◽  
Reproductive Tract ◽  
Malignant Tumors ◽  
Frozen Section ◽  
Cost Effective ◽  
Female Reproductive Tract ◽  
Ultrastructural Examination ◽  
Specific Diagnosis ◽  
Potential Value ◽  
Gynecologic Neoplasms

The female reproductive tract may be the site of a wide variety of benign and malignant tumors, as well as non-neoplastic tumor-like conditions, most of which can be diagnosed by light microscopic examination including special stains and more recently immunoperoxidase techniques. Nevertheless there are situations where ultrastructural examination can contribute substantially to an accurate and specific diagnosis. It is my opinion that electron microscopy can be of greatest benefit and is most cost effective when applied in conjunction with other methodologies. Thus, I have developed an approach which has proved useful for me and may have benefit for others. In cases where it is deemed of potential value, glutaraldehyde-fixed material is obtained at the time of frozen section or otherwise at operation. Coordination with the gynecologic oncologist is required in the latter situation. This material is processed and blocked and is available if a future need arises.

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