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Chemical composition, in percentage, of the relative area of essential oils from Psidium cattleyanum accessions.
Source publication
Polyploidy, a numerical alteration of the karyotype, is one of the most important mechanisms in plant speciation and diversification, but could also be detected among populations, the cytotypes. For example, Psidium cattleyanum, a polyploid complex, has chromosome numbers ranging from 2n=3x=33 to 2n=12x=132. Polyploidization causes an increase in D...
Contexts in source publication
Context 1
... DNA content was positively correlated with the yield of essential oils (r = 0.9903633; P value = 1.74 e-05 ) (Table 1). In addition to the quantitative variations, the plants also showed qualitative variations regarding the chemical composition of their essential oils ( Table 2). Considering that two extractions were carried out at different periods, there was variation only CAT6 in the pattern of the compounds produced (Tables 2 and S1). ...Context 2
... was a predominance of hydrogenated compounds in all the essential oils analyzed, with a greater representation of the class of sesquiterpenes. However, the CAT4, CAT5 (Table 2) and CAT6 (Table S1) accessions presented a greater amount of both oxygenated and hydrogenated monoterpenes. ...Similar publications
‘Ka Hua Kula’ (“golden fruit” in Hawaiian) guava ( Psidium guajava L.) has been released by the Department of Horticulture to fill the need of a better cultivar for processing guava puree.
Citations
... having up to 100 genes) 26,39 and occurrence of lineage-specific pathways and products. Although the essential oil of Psidium species exhibits a great diversity in its chemotypes conditioned to environmental and genetic variations 24,27,40,41 , the evolution of TPS genes in Myrtaceae neotropical fresh fruits remain unknown. The increase of the values of 2C nuclear, CG% and 5-mC% was related to the decrease in (E)-Nerolidol and β-Bisabolol. ...
... Yield and chemical composition of the essential oil. We revisited the data about yield and chemical composition of the essential oil previously published by our research group for P. guajava 40,42 , P. guineense 48 and P. cattleyanum 24 . For the other accesses, the essential oil was extracted based on the methodology used for P. guajava 41 . ...
Diploid and polyploid species derived from the euploid series x = 11 occur in the genus Psidium, as well as intraspecific cytotypes. Euploidy in the genus can alter the gene copy number, resulting in several “omics” variations. We revisited the euploidy, reported genomic (nuclear 2C value, GC%, and copy number of secondary metabolism genes) and epigenomic (5-mC%) differences in Psidium, and related them to essential oil yield and composition. Mean 2C values ranged from 0.90 pg (P. guajava) to 7.40 pg (P. gaudichaudianum). 2C value is intraspecifically varied in P. cattleyanum and P. gaudichaudianum, evidencing cytotypes that can be formed from euploid (non-reduced) and/or aneuploid reproductive cells. GC% ranged from 34.33% (P. guineense) to 48.95% (P. myrtoides), and intraspecific variations occurred even for species without 2C value intraspecific variation. Essential oil yield increased in relation to 2C value and to GC%. We showed that P. guajava (diploid) possesses two and P. guineense (tetraploid) four copies of the one specific TPS gene, as well as eight and sixteen copies respectively of the conserved regions that occur in eight TPS genes. We provide a wide “omics'' characterization of Psidium and show the outcome of the genome and epigenome variation in secondary metabolism.
