O Cerrado possui a flora diversificada que ocorre em diferentes fisionomias. Uma das características marcantes do bioma é a ocorrência de estações chuvosa e seca bem definidas. Durante a seca as plantas do Cerrado estão sujeitas à restrição de água. Os estômatos, que são estruturas epidérmicas responsáveis pelas trocas gasosas, são essenciais para a manutenção do estado hídrico das plantas. Ichthyothere terminalis (Spreng.) Blake é uma Asteraceae herbácea frequente nas formações abertas do Cerrado. A espécie possui sistema subterrâneo espessado, que contribui para persistência da planta no ambiente. No final da seca, ocorre a rebrota dos órgãos aéreos. O objetivo deste trabalho foi o de avaliar as dimensões dos estômatos em folhas de Ichthyothere terminalis em diferentes épocas do ano. Foram realizadas coletas em fisionomias abertas do Cerrado em períodos secos e chuvosos, nos quais as plantas estavam em diferentes fases fenológicas. As folhas foram coletadas, preservadas e fixadas seguindo métodos usuais para análises anatômicas e histométricas. As epidermes foram destacadas e as medições e contagens foram feitas em microscópio de luz. As folhas de Ichthyothere terminalis são anfiestomáticas, com maior densidade estomática na face abaxial. A densidade de estômatos na face abaxial foi maior na transição entra as estações seca e chuvosa. A área dos poros estomáticos foi maior no início da seca nas duas faces epidérmicas. A espécie mostrou capacidade de alterar os atributos dos estômatos em diferentes estações, e isso pode contribuir para sua ocorrência em habitats sujeitos à seca sazonal.
Forest protection management are important activities and integrated from the forest resource management system. One of the activities in forest protection is evaluating stand health in a particular forest region. These activities are important because it helps decision making to perform sustainable forest management. Evaluating stand health on a bigger scale needs more cost, time, and manpower. To overcome this obstacle, there is a need for supporting technology. The technology also needs to suffice within the development of remote sensing. flying drones is a suitable technology that could evaluate stand health. This research has the goal to determine the spectral characteristics of A.mangium leaf in order to identify the area and position of sick trees. This research is executed in A.mangium stand at KPH Bogor. The method that is being used is hyperspectral imaging analysis to determine the characteristic of RGB (Red,Green,Blue). Spectral analysis is sampled from 85 trees on 7 plot at site 23B RPH Maribaya BKPH Parung Panjang KPH Bogor using simple random sampling. The result of this research shows that trees in healthy condition, sick condition, and the dead condition has different spectral RGB value. RGB value for healthy trees is 121-149(B1),167-189(B2), 120-142(B3). For sick trees the RGB value is 151-165(B1), 183-205(B2), 145-165(B3). For dead trees the RGB values are 192-202(B1), 202-212(B2), 167-199(B3). As trees condition worsen, the RGB value increases. The pattern of RGB band composition is similar but has different values. This indicates the changing process of leaf color from healthy to sick. On the other hand the interval of RGB band is small enough to notice there is a difference in the color of the tree’s status. This research shows that spectral analysis from drone image could be used to analyze forest’s stand health
Lippia lupulina Cham. and Lippia pohliana Schauer are species of Verbenaceae used in folk medicine in the Brazilian Midwest. In order to identify the characteristics with taxonomic value that differentiate these species, the morphoanatomical characterization of the leaves and description of the chemical composition of the essential oils was carried out. The investigation of the anatomical characteristics of each species allowed the identification of different structural characters, related to the types of glandular and non-glandular trichomes, types of stomata, structural organization of the petiole's vascular system and the presence of sclereids in the petiole. Regarding the chemical composition of essential oil, in L. lupulina the main constituents were E-caryophyllene, caryophyllene oxide and dauca- 5,8-diene, while in L. pohliana, E-caryophyllene was the main constituent, followed by α-humulene and amorpha-4,7(11)-diene. Therefore, the results found have taxonomic value, as they allow the identification of species and help in the knowledge of the genus. And the characters studied contribute to future morphoanatomical, taxonomic and pharmacological studies.
M orfoanatoMia e Metabólitos de órgãos vegetativos de Apopyros wArmingii (baker) g. l. nesoM e ichthyothere ter-minAlis (spreng.) s. f. blake (asteraceae): estratégias adaptativas ao cerrado rupestre MorphoanatoMy and Metabolites of organs vegetative of Apopyros wArmingii (baker) g. l. nesoM e ichthyothere terminAlis (spreng.) s. f. blake (asteraceae): adaptative strategies to "cerrado rupestre" dayana figueiredo abdalla
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