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4 results on '"Junior, Pedro Corrêa Damasceno"'

1. The impacts of pink pepper (Schinus terebinthifolius Raddi) on fatty acids and cholesterol oxides formation in canned sardines during thermal processing

Author

Barreira, Carla Fernanda Targueta, de Oliveira, Vanessa Sales, Chávez, Davy William Hidalgo, Gamallo, Ormindo Domingues, Castro, Rosane Nora, Júnior, Pedro Côrrea Damasceno, Sawaya, Alexandra Christine Helena Frankland, da Silva Ferreira, Micheli, Sampaio, Geni Rodrigues, Torres, Elizabeth Aparecida Ferraz da Silva, and Saldanha, Tatiana

Published
2023
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3. Male reproduction stability assessed through meiotic and post-meiotic cycles in bushy matgrass (Lippia alba) genotypes for use in breeding

Author

De Oliveira Pinto, Tatiana, Amorim, Gustavo Torres Dos Santos, Tupper, Vivian Torres Bandeira, Da Costa, Igor Nunes Barcellos, De Mello Marques, Mayara, and Junior, Pedro Corrêa Damasceno

Subjects
pollen grain viability, genetic parameters, chromosome number, meiotic index, ploidy level
Abstract

The aim of the present study is to analyze the meiotic and post-meiotic cycles of bushy matgrass genotypes (citral chemotype) in order to better understand their respective male reproduction stability. It is essential estimating such a stability when a nondomesticated species is selected. Therefore, the number of chromosomes of pollen-mother cells, and their ploidy were assessed; possible meiosis anomalies were assessed. Recombination index (RI) was estimated. The number of normal and abnormal post-meiotic products (PM’s) was counted. Meiotic index (MI) and pollen grain viability (VIA) were estimated. These estimates werecarried out per genotype and they were subjected to ANOVA and to average tests. All genotypes were diploid (2n = 30 chromosomes). Pairing was quite regular (RI = 44.33%). Meiotic cycle anomalies recorded very low frequency rates. Assumingly, chromosomal breaks resulted from micronuclei formation in PM’s. Estimated MI was 94.48%, and estimated VIA was 94.32%. MI and Via did not statistically differ between genotypes. These outcomes point towards genotypes’ high male reproduction stability and to the signifi cant infl uence of genetic effects on MI and VIA.

Published
2022
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4. Estimation of genetic parameters for flower anomalies in papaya.

Author

Junior, Pedro Corrêa Damasceno, Pereira, Telma Nair Santana, and Pereira, Messias Gonzaga

Subjects
*PAPAYA, *PLANT genetics, *FRUIT yield, *PLANT hybridization, *STERILITY in plants
Abstract

Floral abnormalities in papaya cause fruit deformation and yield reduction in some periods of the year. This study aimed to evaluate 23 inbreed lines and 22 hybrids in crosses between the lines Solo and Formosa in relation to floral abnormalities, and to develop a methodology to estimate summer sterility by counting of nodes without fruits. The traits evaluated were: number of carpelloid and pentandric fruits (in March and July 2007); number of nodes without fruit and neck length (in December 2006 and April 2007); and sum of abnormalities. Hybrids presented means higher than those of the lines for all abnormalities. The capelloidy was seasonal only for lines, and the pentandry showed the lowest coefficients of determination for lines and hybrids. The number of nodes without fruit was adequate to infersummer sterility. This anomaly was the most important in the lines and hybrids. [ABSTRACT FROM AUTHOR]

Published
2018
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