ABSTRACT
Psychotria viridis Ruiz & Pav (Rubiaceae) occurs naturally throughout the Amazon and it is traditionally used by indigenous communities, being incorporated into religious use in urban contexts over the last few decades. It is known and cultivated in many regions of South America for possessing valuable bioactive alkaloids. In this paper, we described P. viridis leaf morphology, anatomy and histochemistry from three populations cultivated in the southeastern Brazil, in order to identify possible adaptations to local environment and management. All plants presented terminal stipules and basic morpho-anatomical patterns of leaves, consistent with most species of the genus, as heterogeneous dorsiventral mesophyll, uniseriate epidermis, presents large cells with prominent vacuoles and druses. Unicellular non-glandular trichomes and multicellular starry trichomes were present in the primary and secondary veins. Amphi-hypostomatic leaf pattern, not yet described for the species, was common in all studied plants. Variation in the presence of domatia in the same population indicates that this structure cannot be used for taxonomic determination of P. viridis, as already described for other species of the genus. Presence of secretory ducts and reduction in stomata density and leaf area represent the main morpho-anatomic adaptations of plants from drier and warmer climates. Histochemical tests were positive for alkaloids, polysaccharides, proteins and phenolic compounds, being negative for starch only in plants subjected to water stress. We concluded that the morpho-anatomical and histochemical alterations found in the plants of this study resulted from seasonal water deficit adaptations and to maintain or attract mutualistic organisms
Subject(s)
Banisteriopsis/anatomy & histology , Banisteriopsis/cytology , Banisteriopsis/chemistry , ImmunohistochemistryABSTRACT
RESUMO: Com o intuito de avaliar os efeitos da antibioticoterapia no crescimento de plantas micropropagadas de abacaxizeiros, bem como na comunidade bacteriana endofítica da espécie, realizaram-se análises moleculares. Verificou-se a presença de endófitos no interior das microplantas, mesmo após 30 dias de cultivo em meio de cultura MS, suplementado com diferentes antibióticos, e analisou-se o crescimento da parte aérea e radicular das microplantas. Decorrido o período de 30 dias de cultivo, constatou-se ainda a presença de bactérias endofíticas, no entanto, as microplantas apresentaram acentuada redução no crescimento da parte aérea e radicular, evidenciando assim a influência da microbiota endofítica no crescimento das microplantas in vitro e a importância da manutenção do equilíbrio endofítos/microplanta.
ABSTRACT: This research aimed to evaluate the antibiotic therapy effects in the growing of micropropagated pineapple plants as well as in the community of the endophytic bacterial of the species. It was performed molecular analyzes and verified the presence of endophytes within microplants even after 30 days of culture on MS medium supplemented with different antibiotics and analyzed the development growth of shoots and roots of microplants. After the period of 30 days of cultivation, even being checked the presence of endophytic bacteria, it was verified that the microplants showed reduction of the growing of shoots and roots, thereby demonstrating the influence of in vitro endophytic microorganisms in the development of microplants, and the importance of maintaining it in equilibrium with endophytes/ microplants.
ABSTRACT
A pupunheira tem se mostrado boa alternativa à exploração extrativista de espécies como juçara e açaí. Porém, quando produzida via sementes apresenta plantio heterogêneo, o que torna a micropropagação ótima alternativa para seu cultivo em larga escala. O experimento objetivou avaliar a influência da interação entre nitrato de amônio e nitrato de potássio no enraizamento de microplantas obtidas a partir do desenvolvimento in vitro de embriões somáticos de pupunheiras, visando otimizar seu protocolo de micropropagação. Os embriões foram inoculados em meio MS com diferentes concentrações de NH4NO3 e KNO3. Aos 120 e 240 dias de cultivo, foram avaliados parâmetros morfofisiológicos do desenvolvimento radicular. Aos 120 dias, nas concentrações mais baixas de nitrogênio, houve estímulo ao crescimento das raízes e a maior ramificação radicular ocorreu com baixas concentrações de NH4NO3 e altas de KNO3. Aos 240 dias, notou-se redução do crescimento radicular e raízes finas prevalecentes. Conclui-se que até 120 dias as microplantas devem ser mantidas em meio com concentrações menores de NH4NO3 e maiores de KNO3 que as empregadas no meio MS, voltando para as concentrações usuais após esse período.
Pejibaye is a good alternative for the extractive exploration of species such as juçara and açaí. However, when it is produced by seeds its planting is heterogeneous, which makes micropropagation a good alternative for cultivation in large scale. This study aimed to evaluate the influence of the interaction between ammonium nitrate and potassium nitrate on peach palm somatic embryos rooting in vitro cultivated, for optimization of the micropropagation protocol. The embryos were inoculated in MS medium with different concentrations of NH4NO3 and KNO3. Morphophisyologic parameters of root development were measured at 120 and 240 days of cultivation. At 120 days, at lower nitrogen concentrations, roots were stimulated to grow and major root branching occurred at low concentrations of NH4NO3 and high concentrations of KNO3. At 240 days, there was a reduction of the root growing, with more percentage of thin roots. It was concluded that up to 120 days, the microplants should be cultivated in culture medium with lower concentrations of NH4NO3 and higher concentrations of KNO3 than those recommended by MS medium, and after this period they should be cultivated at the recommended doses.