ResumoO presente trabalho estudou a necessidade do uso da auxina exógena Ácidoindol-butirico (AIB) no enraizamento de estacas caulinares da Varronia curassavica Jacq. O experimento foi conduzido em casa-de-vegetação com controle parcial de temperatura e umidade, na área experimental do setor de Olericultura do Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro (IFTM) em Uberaba, MG. Avaliaram-se os efeitos de diferentes doses do AIB no processo de enraizamento de estacas de erva baleeira (0, 200, 400, 600, 800 e 1000 mg L -1 ), posteriormente plantadas em tubetes contendo mistura de areia e vermiculita na casa-de-vegetação. O delineamento experimental utilizado foi o em bloco casualizados, com seis tratamentos quantitativos e quatro repetições, totalizando 24 unidades experimentais. Após 65 dias, avaliou-se o enraizamento pelo índice de sobrevivência das estacas e a análise estatística foi feita através de análise de regressão. A análise nos mostra que o hormônio AIB exerce influência significativa sobre a porcentagem de plantas sobreviventes. A melhor dose do hormônio AIB para o enraizamento de estacas de erva baleeira, em relação ao maior numero de estacas brotadas, foi de 223 mg L -1 , ajustando-se o modelo de grau 2. Conclui-se que pode ser realizado um eficiente enraizamento da erva baleeira com dose de 223 mg L -1 de AIB, em condições ambientais semicontroladas. Palavras chave: auxina exógena, ácido indolbutírico, erva baleeira Adventitious rooting of cuttings of Varronia curassavica Jacq. with use of indol butyric acid AbstractThis work studied the need for the use of exogenous auxinindole-butyl acid (IBA) on rooting cuttings of Varronia curassavica Jacq. The experiment was conducted in a greenhouse, with partial control of temperature and humidity in the experimental area of Horticultural sector of the Federal Institute of Education, Science and Technology (IFTM) in Uberaba, MG, Brazil. It has been evaluated the effects of different AIB doses in the rooting process of cuttings (0, 200, 400, 600, 800 e 1000 mg L -1 ), then planted in plastic tubes containing a mixture of sand and vermiculite in-house-vegetation. The experimental design was a randomized block with six quantitative treatments and four replications, totaling 24 experimental units. After 65 days, were evaluated the rooting by the survival rate of cuttings and statistical analysis was performed using regression analysis. The best dose of IBA hormone for rooting cuttings, for the largest number of sprouting, was 223 mg L -1 , by adjusting the degree of model 2. For other doses, do not differ significantly from the control. It is concluded that can be carried out efficiently rooting of the Varronia curassavica Jacq. at a dose of 223 mg L -1 IBA, in semi controlled environmental conditions.
The objective of this work was to estimate the optimal number of harvests for the reliable selection of zucchini (Cucurbita pepo) hybrids through the repeatability coefficient. The experimental design was randomized complete blocks with 33 treatments (31 experimental hybrids and 2 commercial ones) and four replicates, with six plants per plot. Fifteen harvests were carried out. Seven morphoagronomic fruit characteristics were evaluated, and repeatability coefficients were estimated using four statistical methods. The repeatability coefficients ranged from low to moderate, regardless of the studied characteristic. For a high-precision selection (R2≥90%), a high number of evaluated harvests was required, especially for traits related to fruit yield, as follows: 30 to 54 harvests for selection based on total yield; and 43 to 83 harvests for commercial yield, which varied according to the statistical estimation method. The principal component analysis based on the covariance matrix required the least number of harvests for a satisfactory selection precision. Fifteen harvests are sufficient for a satisfactory selection of all evaluated characteristics, with a precision above 70%.
The growing consumer demand for sweet potato roots results in the need for genotypes with higher yields and better root quality. Thus, the objective of this study was to agronomically evaluate sweet potato genotypes via mixed models to select superior genotypes for human consumption and predict their selection gains. The study had a partially balanced triple lattice design with three replicates.As treatments, 92 sweet potato genotypes from the Universidade Federal de Lavras germplasm bank selected in the first selection cycle were evaluated along with eight controls, namely,
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