Open Access Original Research Article

Genetic Diversity and Responses of Some Selected Yellow Maize Genotypes to Stem Borer (Sesamia calamistis Hampson) Infestation

Omotola Solomon Oyeniyi, Bunmi Olasanmi, Samuel Adelowo Olakojo, Solomon Tayo Akinyosoye

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/jeai/2019/v39i130322

Aims: Identification of promising resistant parents against stem borer infestation for the development of high yielding maize hybrids.

Study Design: Ten yellow maize genotypes selected for yield potential and durable level of tolerance to stem borer infestation were used in this study. A stem borer resistant yellow maize variety was crossed with nine stem borer (not necessarily resistant) maize varieties in a top-cross mating design.

Place and Duration of Study: The study was conducted in 2017 and 2018 at the Institute of Agricultural Research and Training, OAU, Ibadan, Nigeria.

Methodology: The resulting nine F1 hybrids along with the ten parents were evaluated under irrigation using a Randomized Complete Block Design (RCBD) with three replications in a stem borer endemic area. Data collected were subjected to combined analysis of variance (ANOVA), principal component analysis (PCA) and hierarchical clustering analyses.

Results: Results obtained showed significant differences for year and genotype, as well as their interaction for some traits measured. Maize varieties were delineated into three groups. The first two PCA with Eigen values greater than 1.0 accounted for 73.0% of the variation; where PC1 was responsible for 52.5% of the variation and was associated with percentage stem borer infestation, leaf damage, plant aspect, stem tunneling ratio and dead heart. PC2 accounted for 20.5% and associated with only grain yield (GY). Also, maize hybrids had higher GY and better resistance to stem borer than their parents by 24.3% and -14.3%, respectively. BR9928-DMR-SR-Y was identified as resistant to stem borer with high GY in hybrid combinations. Positive and significant correlation was obtained among infestation parameters.

Conclusion: Genes from promising donor parents may be introgressed into other desirable maize germplasm for the development of stem borer resistant maize hybrids.

Open Access Original Research Article

Perception about Environmental Education in Agronomy Course in Agricultural Sciences Center of the Federal University of Alagoas

Alessandra Keilla da Silva, Jonas Olimpio de Lima Silva, Luiggi Canario Cabral e Sousa, Orlando Angelo Neto, Jhon Wilkson Batista, Maria José de Holanda Leite, Roberta Patrícia de Sousa Silva, Sérvio Túlio Pereira Justino

Journal of Experimental Agriculture International, Page 1-9
DOI: 10.9734/jeai/2019/v39i130323

Environmental education is an essential instrument for the formation of a critical conscience in society as a whole. The formation of the agronomy course must be intrinsically linked to environmental issues, since the activities developed by the future professional have direct consequences to nature, so the decisions must have as pillars, the understanding of environmental issues and the promotion of the sustainability in agroescosystems. The present research had as aim to perform a diagnosis on the environmental perception of students and professors of the agronomy undergraduate course of the Agricultural Sciences Center of the Federal University of Alagoas (CECA – UFAL). This work was carried out through a qualitative research, where the data collection was based on a questionnaire, with a sample of 95 students and 15 teachers. Therefore, a deficient and inconsistent approach regarding environmental education in the agronomy course of the CECA-UFAL, thus it is recommended that more disciplines be inserted for environmental education, not only in the course of agronomy, but in all the course of the area of agrarian sciences.

Open Access Original Research Article

Organomineral Fertilizer in Pineapple Cultivars in the Acclimatization Stage of Seedlings Produced “In vitro”

Luciana Freitas de Medeiros Mendonça, Vander Mendonça, Eduardo Castro Pereira, Grazianny Andrade Leite, Toni Halan da Silva Irineu, Luana Mendes de Oliveira, Elias Ariel de Moura, Wilma Freitas Celedônio, Alex Danilo Monte de Andrade

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/jeai/2019/v39i130324

This study aimed at evaluating the effect of organomineral fertilizer doses on the growth and nutrition of seedlings of pineapple cultivars during the acclimatization stage. The trial was carried out in the University Federal Rural do Semi-Árido under greenhouse conditions, at Mossoró – Rio Grande do Norte, from July 2013 to April 2014. The trial was carried out in randomized blocks design in a 2x5 factorial scheme, with 2 pineapple cultivars (Imperial and Vitoria) and 5 doses of organomineral fertilizer (0; 2.5; 5; 7.5 and 10 g), amounting 10 treatments with 4 replications and 5 seedlings per plot. The qualitative data means were compared by Scott-Knott test at 5% of probability, and the quantitative data were submitted to regression analysis and the mathematical models were adjusted with a probability for the t-test of p<0.05 for the equation parameters. The cultivars reached appropriate growth for transferring to the field after 210 days. The doses of organomineral fertilizer that increased the biometrical characteristics were 10 g and 5 g for both ‘Vitoria’ and ‘Imperial’ cultivars, respectively.

Open Access Original Research Article

Characterization and Diversity of Peppers (Capsicum spp.) Genotypes Based on Morphological Traits Using Multivariate Analysis

Talles de Oliveira Santos, Monique Moreira Moulin, Leandro Heitor Rangel, Raíssa Olmo Lacerda Pirovani, Fernanda Vargas Valadares, Rafael Nunes de Almeida, Laricia Olária Emerick Silva

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/jeai/2019/v39i130325

The present work aimed to characterize and evaluate Capsicum peppers in the South of the State of Espírito Santo, in order to estimate the variability among the accessions for the Germplasm Bank implementation. For this, 33 genotypes were collected through donations in four municipalities in the region. The genotypes were characterized based on nine quantitative descriptors: number of seeds per fruit (NS), number of fruit locules (NL), number of fruits per plant (NFR), plant height (PH), leaf width (LW), leaf length (LL), fruit length (FRL) and fruit diameter (FRD). Analysis of variance and means grouping by the Scott-Knott test was performed (P=.01). To estimate the diversity, the Tocher method was realized. The GT Biplot analysis was performed with using RStudio program to estimate discrimination, representativeness and correlation of characteristics. It was found a great diversity among the studied genotypes, being able to emphasize the accession Ifes 01 and Ifes 03 as the most divergent ones. The Tocher grouping allowed the formation of seven groups. The biplot analysis presented the formation of three groups of characteristics. The access Ifes 01 stood out for the group of characteristics FRL, NS and FRD. The Ifes 32 accession was highlighted for the PH and DC characteristics group, and the Ifes 20 accession was highlighted for the group formed by the NFR characteristic. It was observed that the characteristics that contributed the most to the divergence of accessions were PH and DC, and the most representative characteristic was DC. So, it’s concluded that there is great variability among the genotypes collected, presenting great phenotypic variation for the nine characters studied. In addition, some accesses were promising for plant breeding programs, pointing to gains in the various segments of the peppers market, which shows the importance of the collections of the producers in the South of Espírito Santo.

Open Access Original Research Article

Natural and Ecological Succession in an Urban Fragment of the Atlantic Forest in Pernambuco, Brazil

Amanda Ferreira Carnaúba, Lidiana Nayara Ralph, Shyrlaine Lilian Moura Leão, Yasmim Yathiara Gomes Araújo Morais, Ana Lícia Patriota Feliciano

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/jeai/2019/v39i130326

The development of studies on natural regeneration in fragments of the Atlantic Forest assists to evaluate the regenerative power of forests against natural and anthropic disturbances. So, the objective of the work was to analyze the structure of the regenerative component and ecological succession of arboreal species in an urban fragment of Atlantic Forest. The study was undertaken in Parque Estadual Dois Irmãos (PEDI), in Recife, Pernambuco, in which 10 subplots of 1 m x 25 m (25 m²) each was installed. As inclusion criterion, the regenerating individuals of arboreal species should have a height equal to or greater than one meter and circumference at the height of the chest (CAP 1.30 m) inferior to 15 cm. The individuals were classified as the ecological groups origin (native or exotic species) and were calculated via phytosociological parameters such as heights classes for regenerating individuals and diversity index. For data analysis Mata Nativa version 4.05 was used. The families that presented the highest number of species were: Myrtaceae and Fabaceae. It was observed that 15% of the species belong to the pioneer group, while 48% belonged to the initial secondary group, and 22% to the late secondary group. The distribution of individuals of the species Hirtella racemosa and Chamaecrista ensiformis in the different size and relative density classes allow us to affirm that these species act directly in the process of ecological succession. The fragment is in the initial secondary stage of succession.