Description of morphological characters of lettuce (Lactuca sativa L.) genetic resources

Křístková, E.; Doležalová, Ivana; Lebeda, A.; Vinter, V.; Novotná, Alžběta

doi:10.17221/4/2008-hortsci

Cited by 81 publications

(55 citation statements)

References 43 publications

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“…There are tremendous morphological variations such as leaf length, shape, size, color, and heading type in different types of lettuce [83] . Leaf anatomical structure that closely related to photosynthetic performance also varies greatly among and within plant species under different environmental conditions [84][85][86] .…”

Section: Canasta) Grown Under Different Qualities Of Ledsmentioning

confidence: 99%

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

He¹,

Qin²,

Chow³

2019

International Journal of Agricultural and Biological Engineering

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The success of growing vegetables indoors requires the most appropriate selection of lighting spectrum. This mini review discusses the impacts of LED spectral quality on different leafy vegetables with a focus on the studies of Chinese broccoli (Brassica alboglabra), ice plants (Mesembryanthem crystallinum) and lettuce (Lactuca sativa L. cv. Canasta). For each species, plants exposed to different spectral LED lights were all under the same light intensity and same photoperiod. Chinese broccoli grown under red(R):blue(B)-LED ratio of 84:16 (16B) had the highest light-saturated photosynthetic CO 2 assimilation rate (A sat ) and stomatal conductance (g s sat ) compared to plants grown under other R:B-LED ratios. It was also shown that 16B is the most appropriate selection for Chinese broccoli to achieve the highest shoot productivity with a rapid leaf number and leaf area development. The highest concentrations of photosynthetic pigments, soluble and Rubisco protein on a leaf area basis were also observed in 16B plants. The results conclusively affirmed that the highest productivity of Chinese broccoli grown under 16B is closely linked to the highest photosynthetic performance on a leaf area basis. For ice plants grown under R:B-LED ratios of 90:10 (10B), they had the highest shoot biomass with a faster leaf development compared to plants grown under other RB-LED combinations. However, there were no differences in A sat , g s sat , photosynthetic pigments, soluble and Rubisco proteins on a leaf area basis. In the case of lettuce plants, it was a surprise to observe that plants grown under 0B and 20G (20% green (G)-LED and 80% R-LED) had the highest shoot biomass, and largest total leaf area and light interception area but the lowest net maximal photosynthetic rate on a leaf area basis, compared to other plants. The combined RB-LED enhanced other photosynthetic parameters while 0B and 20G conditions had inhibitory effects on maximum quantum efficiency of PS II with lower photosynthetic pigments, total soluble protein and Rubisco protein. These results suggest that impacts of LED light quality on productivity of lettuce (L. sativa L. cv. Canasta) are closely linked to leaf traits not associated with photosynthetic performance on a leaf area basis.

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Section: Canasta) Grown Under Different Qualities Of Ledsmentioning

confidence: 99%

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

He¹,

Qin²,

Chow³

2019

International Journal of Agricultural and Biological Engineering

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“…The study material included 596 accessions of L. sativa and 615 accessions belonging to eight wild species assigned to either the primary, secondary or tertiary lettuce gene pool (Koopman, 2002). butterhead, cos, crisp, cutting, latin, stalk and oilseed lettuce (Krístková et al, 2008;Mou, 2008). Investigated accessions of cultivated lettuce included all generally recognized crop types, i.e.…”

Section: Study Materialsmentioning

confidence: 99%

Distribution of downy mildew (Bremia lactucaeRegel) resistances in a genebank collection of lettuce and its wild relatives

Treuren

Arend

Schut

2011

Plant Genet. Resour.

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Genebanks serve as a rich source of diversity that can be exploited for crop improvement. However, large numbers of accessions usually have to be evaluated to find material with the characters of interest, and therefore, enhanced trait information can facilitate the more efficient selection of accessions by users. In this study, we report on the distribution of resistances to 28 races of downy mildew among 1223 genebank accessions of cultivated lettuce (Lactuca sativa L.) and 14 related wild species. Due to modern plant breeding, the overall level of resistance of cultivars released after 1950 appears to have increased two-to three-fold compared with varieties from earlier periods. Although fully resistant reactions could be observed among the accessions of cultivated lettuce for each of the 28 investigated races, the resistance probability was more than two-fold higher on average for accessions from the wild gene pool. In general, species of the primary gene pool appeared less resistant than those of the secondary or tertiary gene pool. Probabilities for examined Lactuca species ranged from 0.29 for L. serriola to 1.00 for L. perennis compared with 0.19 for cultivated lettuce, with lower overall resistance probabilities observed only for L. altaica, L. dregeana and L. tenerrima. For L. serriola, the closest relative of cultivated lettuce and the wild species with the highest number of examined accessions, resistance probabilities to each of the investigated downy mildew races were relatively high for populations originating from Eastern Europe and Northern Asia.

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“…Lettuce cultivars originated from different regions of the world and the complex breeding lines are hardly dated with precision (de Vries, 1997). Mediterranean and Chinese cultivars are regarded as the oldest, and tomb wall paintings of garden lettuce appear in numerous Old Kingdom and Middle Kingdom tombs in Egypt showing evidence for cultivation since 2680 BC (Křístková et al, 2008;Zohary et al, 2012). Today, lettuce cultivars are classified in 'cultivar groups'.…”

Section: Introductionmentioning

confidence: 99%

Bacterial networks and co‐occurrence relationships in the lettuce root microbiota

Cardinale

Grube

Erlacher

et al. 2014

Environmental Microbiology

210

131

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Lettuce is one of the most common raw foods worldwide, but occasionally also involved in pathogen outbreaks. To understand the correlative structure of the bacterial community as a network, we studied root microbiota of eight ancient and modern Lactuca sativa cultivars and the wild ancestor Lactuca serriola by pyrosequencing of 16S rRNA gene amplicon libraries. The lettuce microbiota was dominated by Proteobacteria and Bacteriodetes, as well as abundant Chloroflexi and Actinobacteria. Cultivar specificity comprised 12.5% of the species. Diversity indices were not different between lettuce cultivar groups but higher than in L. serriola, suggesting that domestication lead to bacterial diversification in lettuce root system. Spearman correlations between operational taxonomic units (OTUs) showed that co-occurrence prevailed over co-exclusion, and complementary fluorescence in situ hybridization-confocal laser scanning microscopy (FISH-CLSM) analyses revealed that this pattern results from both potential interactions and habitat sharing. Predominant taxa, such as Pseudomonas, Flavobacterium and Sphingomonadaceae rather suggested interactions, even though these are not necessarily part of significant modules in the co-occurrence networks. Without any need for complex interactions, single organisms are able to invade into this microbial network and to colonize lettuce plants, a fact that can influence the susceptibility to pathogens. The approach to combine co-occurrence analysis and FISH-CLSM allows reliably reconstructing and interpreting microbial interaction networks.

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Description of morphological characters of lettuce (Lactuca sativa L.) genetic resources

Cited by 81 publications

References 43 publications

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

Distribution of downy mildew (Bremia lactucaeRegel) resistances in a genebank collection of lettuce and its wild relatives

Bacterial networks and co‐occurrence relationships in the lettuce root microbiota

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