Structural differentiation among annual shoots as related to growth dynamics in Luma apiculata trees (Myrtaceae)

Puntieri, Javier; Torres, Cristián; Magnin, Amaru; Stecconi, Marina; Grosfeld, Javier

doi:10.1016/j.flora.2018.10.005

Cited by 12 publications

(15 citation statements)

References 72 publications

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“…However, this extract resulted to be inactive for all Gram-negative bacteria tested, as well as the hexane extract from L. apiculata branches. Since flowers appear in nature only between December to March [23] and the extract resulted partially active (very high concentration to show antimicrobial activity), we discard their use as an antimicrobial source. Furthermore, we discarded the extracts from leaves, flowers or branches obtained with solvents of major polarity than hexane, because these extracts had no antimicrobial effect against all bacteria tested.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Effect ofLuma apiculata(DC.) Burret Extracts in Clinically Important Bacteria

Araya-Contreras

Veas

Escobar

et al. 2019

International Journal of Microbiology

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Nosocomial infections caused by bacteria are one of the main public health problems. Moreover, the resistance to antibiotics by these bacteria makes it necessary to find new treatments to fight them. Objective. To evaluate the antibacterial activity of Luma apiculata (DC.) Burret extracts on bacteria of clinical importance. Materials and Methods. In this study, extracts were obtained at room temperature by successive extraction of L. apiculata leaves, flowers, and branches and treated separately with solvents of ascending polarity (i.e., hexane, methylene dichloride, ethyl acetate, ethanol, methanol, and water) to extract the compounds depending on their polarity. Then, the extract's antibacterial activity was tested against Staphylococcus aureus, Staphylococcus epidermidis, Staphylococcus saprophyticus, Enterococcus sp, Acinetobacter baumanii, Pseudomonas aeruginosa, and Escherichia coli. Results. The hexane extract of L. apiculata leaves resulted to be active against all bacteria tested. Among them, S. aureus showed to be the more susceptible, showing a minimum inhibitory concentration (MIC) of 120 μg/ml. In addition, a growth curve was performed, and colonies were counted. A decrease in bacterial growth was observed when the hexane extract of L. apiculata leaves was added. Besides, the hexane extracts of L. apiculata flowers resulted to be active against all Gram-positive tested bacteria. However, at higher concentrations, this extract resulted inactive for the Gram-negative bacteria tested. The hexane extract of L. apiculata branches resulted to be inactive in all cases. The extracts obtained treating separately leaves, flowers, or branches with solvents of major polarity than the hexane in a successive extraction of ascending polarity methodology resulted also to be inactive as an antimicrobial against all bacteria tested. Discussion/Conclusion. The hexane extract of L. apiculata leaves showed the lower MIC against S. aureus when compared with extracts obtained from other parts of the plant. The growth curve and the colonies count suggest a bacteriostatic activity of the L. apiculata leaves extract against Staphylococcus aureus.

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Section: Resultsmentioning

confidence: 99%

Antibacterial Effect ofLuma apiculata(DC.) Burret Extracts in Clinically Important Bacteria

Araya-Contreras

Veas

Escobar

et al. 2019

International Journal of Microbiology

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“…Growth stops near the summer solstice (the warmest period of the year), which consequently allows lignification and cell wall production to finish early enough (Rossi et al 2008). In the present study, although the growth season could extend beyond the warmest month of the year (January in this region; Conti 1998), the proportion of plants that did so was notably higher in the case of rainforest species with the exception of L. apiculata (but see Puntieri et al 2018). Thus, our results provide moderate support to the idea that rainforest species are adapted to conditions in which early frosts are unlikely.…”

Section: Groupmentioning

confidence: 48%

The dynamics of primary growth in woody species from rain and transitional forests of Argentinean north Patagonia

et al. 2020

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Rainforests (RF) and transitional forests (TF) of Argentinean north Patagonia develop under such different climatic conditions that key aspects of seasonal growth may be assumed to differ among the woody plants that characterize these forests. This study was aimed at evaluating primary growth dynamics in tree species typical of RF and TF. Two common-garden essays were performed in Bariloche, Argentina, one with RF species and the other with TF species. The times of extension initiation and end, the duration of the extension period and the relative and absolute extension rates (RER and AER, respectively) were registered for each species. The relation between AER and air temperature was compared between species. In general, RF species had less variable times of extension initiation, extension end and time of maximum RER, and longer-lasting extension than TF species. Among RF species, extension duration was the longest for Caldcluvia paniculata (26.9 weeks, on average) and the shortest for Luma apiculata (18.9 weeks). Among TF species, the longest and shortest extension durations corresponded, respectively, to Diostea juncea (18.2 weeks) and Maytenus boaria (13.0 weeks). The extension rates of RF species tended to be more related to temperature than those of TF species. This study provides some evidence that endogenous control of growth dynamics would be tighter in TF than in RF species; the former would be better adapted to more severe climatic conditions during the primary-growth period.

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“…early summer), that is, later than in other native Patagonian woody species studied so far (with maximum RER in early-mid spring; e.g. Puntieri et al 2018). This contrast may be due to the low number of leaf primordia present in the winter buds (i.e.…”

Section: R a F T 15mentioning

confidence: 82%

Variations in growth and architecture in the range limit of Salix humboldtiana, the willow native to South America

Salgado

Gallo

Torres

et al. 2021

Botany

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The conditions faced by edge populations of a tree species may affect the architecture of individual trees. The latitudinally broad range of Salix humboldtiana encompasses tropical to cold-temperate climatic regions, with its southernmost population in central Patagonia. We expected S. humboldtiana trees from the southern-edge population to develop smaller shoots and a lower level of axis differentiation than trees of this species from a more northerly population, and expected edge trees to outperform non-edge trees when growing in common-garden at an intermediate latitude. For juvenile individuals of S. humboldtiana from edge and non-edge natural populations, trunk diameter, height, branching angle, and the length, number of nodes, diameter, leaf area and specific leaf area of main branch and trunk annual shoots were measured. The size and extension rates of shoots developed by trees of both origins in a common-garden were also evaluated. In natural populations, shoot leaf area and specific leaf area were higher for the edge population than for non-edge population. In common garden, shoot extension period and length were higher for non-edge plants than for edge plants. Growth-period differences between populations in the common garden may support the hypothesis of stress adaptation in the southernmost S. humboldtiana trees.

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Structural differentiation among annual shoots as related to growth dynamics in Luma apiculata trees (Myrtaceae)

Cited by 12 publications

References 72 publications

Antibacterial Effect ofLuma apiculata(DC.) Burret Extracts in Clinically Important Bacteria

Antibacterial Effect ofLuma apiculata(DC.) Burret Extracts in Clinically Important Bacteria

The dynamics of primary growth in woody species from rain and transitional forests of Argentinean north Patagonia

Variations in growth and architecture in the range limit of Salix humboldtiana, the willow native to South America

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