The aim of this work was to evaluate the effect of fi ve light qualities [fl uorescent lamps (FL); white (WL), red (RL), blue (BL), or red/blue LEDs (RBL)] and two types of fl ask sealing (with or without porous membranes) in the in vitro germination and growth of two Capsicum frutescens cultivars (Espaguetinho and Cayenne). For this, two seeds were inoculated per fl ask (350 mL) containing 50 mL of MS medium with 100 mg L -1 myo-inositol, 30 g L -1 sucrose, 6.0 g L -1 agar, and pH 5.8 ± 0.1. The plants were kept under culture room conditions (16-h photoperiod, 25 ± 2°C and irradiance of 40 μmol m -2 s -1 ).The experiment was arranged in CRD, 2x5x2 factorial scheme (Cultivar X Light qualities X Sealing type). At 42 days, the following traits were evaluated: percentage of germination; root and shoot length; number of green leaves, senescent leaves and nodal segments; and fresh and dry weight. Plants grown under RL and BRL, showed greater number of green leaves, and longer shoots and roots. The use of porous membranes remarkably reduced the number of senescent leaves. Thus, the use of porous membranes, RL and BRL are recommended since they improve growth and development of pepper in vitro.
O objetivo do trabalho foi avaliar o efeito do extrato aquoso de tubérculos de tiririca (Cyperus rotundus), comparando-o com a ação dos hormônios vegetais ácido indolbutírico e ácido naftalenoacético, em estacas de videira (Vitis vinifera L. [var. Bordô e Niágara]). O experimento foi conduzido em delineamento inteiramente casualizado, em esquema fatorial 2 x 4, sendo duas variedades (Bordô e Niágara) e quatro indutores de enraizamento (ácido indolbutírico, ácido naftalenoacético, extrato aquoso de tiririca e água destilada – controle). Após 125 dias de condução do experimento, foram avaliados: número de folhas, número de raízes, número de brotos, comprimento da raiz, comprimento da parte aérea e massa seca da raiz e das folhas. O extrato aquoso de tiririca promoveu resultados satisfatórios sobre o número de brotos e o comprimento de raízes, não diferindo estatisticamente dos hormônios vegetais sintéticos. Entretanto a resposta foi diferente entre as variedades, não ocasionando incremento significativo de massa seca de raiz e de folhas. O número de folhas das variedades de videira é dependente do genótipo, assim como a matéria seca de raiz e de folhas. O extrato aquoso de tiririca pode ser uma alternativa sustentável para promover o enraizamento de estacas, em função da presença de substâncias que estimulam o enraizamento.
Secondary metabolites are produced by certain plant species and may influence the development of some species through the action of allelopathic effects. Thus, the objective of this study was to evaluate the allelopathic effect of Lippia alba essential oil on the germination, emergence and vigor of seedlings of different batches of lettuce seeds. This experiment was conducted in a completely randomized design with a 3´5 factorial scheme consisting of three batches of seeds of the cultivar Grand Rapids® and five doses of L. alba essential oil (0, 0.25, 0.50, 0.75 and 1.00%) diluted in distilled water and homogenized in Tween® 80. Seed germination and vigor, in the laboratory (experiment I), and emergence, in a protected environment (experiment II), were evaluated. The results demonstrated that there was an inhibitory effect with a significant reduction of germination, vigor and seed emergence when L. alba essential oil was added starting at concentrations of 0.25%. The essential oil showed allelopathic potential over different lettuce seed lots, affecting germination, vigor and seed emergence.
A planta medicinal Tetradenia riparia pode ser propagada vegetativamente, no entanto, não há relatos do emprego da técnica de miniestaquia provenientes de diferentes porções do ramo e do tipo de corte para propagação desta planta. Com isso, o objetivo deste trabalho foi avaliar a produção de mudas a partir de miniestacas provenientes de diferentes porções do ramo e com diferentes tipos de corte apical. O experimento foi conduzido em delineamento de blocos casualisados, constituído de seis tratamentos [miniestaca proveniente da porção apical em corte reto (T1) e em bisel (T2); miniestacas da porção mediana em corte reto (T3) e em bisel (T4); miniestacas da porção basal em corte reto (T5) e em bisel (T6)] e quatro repetições cada. Após 60 dias, avaliaram-se: número de folhas, número de brotos, comprimento de brotos, massa fresca e massa seca de raiz e da parte aérea e o somatório de enraizamento. Observou-se que as miniestacas em T2 apresentaram os melhores resultados com relação às variáveis analisadas. As miniestacas medianas e da base apresentaram resultados inferiores, e o tipo de corte apresentou influência na propagação das miniestacas. Assim, Tetradenia riparia pode ser propagada vegetativamente por miniestaquia provenientes do ápice dos ramos com corte em bisel.
Thiesen, L. A.; Pinheiro, M. V. M.; Holz, E.; Fontana, D. C.; Santos, J. dos 249 Journal of Environmental Analysis and ProgressJournal homepage: www.jeap.ufrpe.br/ http://dx. A B S T R A C TThe dry matter production of the crops is limited by the photosynthetic pigments, an indicator of productivity that may be restricted to the growth and development of plants. The objective of the study was to determine a correlation between photosynthetic pigments and a phytomass of Aloysia triphylla in response to different water availability. The experiment was carried out in a protected environment at the Federal University of Santa Maria, Campus Frederico Westphalen. It was conducted in a randomized block design with four treatments, four blocks and the experimental unit composed of 16 plants/block, in the period of August 28, 2015, to March 21, 2016. The treatments consisted of different levels of water availability (100, 75, 50 and 25% of the soil field capacity). They were evaluated: Chlorophyll a, chlorophyll b, carotenoids, total chlorophyll, chlorophyll a/b ratio, total chlorophyll/carotenoid ratio and total dry matter, dry mass of leaves and stem. Data were submitted to Pearson's linear correlation aiming to verify the dependence of one variable on another. After 152 days, it was possible to observe that there was a high and positive correlation between chlorophyll a and b, both of which presented a negative correlation with the chlorophyll a/b ratio. Chlorophyll b showed correlation with total phytomass and leaves. It was also observed that total chlorophyll showed correlation with all variables, except for those of stem and leaf dry matter and total phytomass. It was concluded that chlorophyll b presents positive correlation with dry leaf mass and total dry matter, and the leaf dry mass has a positive correlation with dry stem mass and total phytomass of A. triphylla.
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