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Rice blast: strategies and challenges for improving genetic resistance
Nizolli,Valéria Oliveira; Pegoraro,Camila; Oliveira,Antonio Costa deAbstract: Rice blast, caused by the fungus Pyricularia oryzae L., is considered one of the main threats to world rice production. The development of resistant cultivars is one of the best and sustainable control alternatives. Plant breeding efforts have been accelerated by genetic mapping (linkage and associative) and marker assisted selection. On the other hand, genomic editing techniques, such as meganuclease...
Is the genetic variability of elite rice in southern Brazil really disappearing?
Busanello,Carlos; Venske,Eduardo; Stafen,Cássia Fernanda; Pedrolo,Ana Marina; Luz,Viviane Kopp da; Pedron,Tatiana; Paniz,Fernanda PolloAbstract There is a worldwide concern about a possible narrowing of the genetic base of most crops, as e.g. that of rice (Oryza sativa L.), as a result of the modern breeding practices. Thus, the purpose of this study was to investigate this phenomenon in the germplasm of elite paddy rice in southern Brazil, including frequently used accessions in crosses. The panel consisted of 91 accessions. Data of morpholog...
Uni- and multivariate methods applied to the study of the adaptability and stab...
Rother,Vianei; Verdi,Cezar Augusto; Thurow,Liamara Bahr; Carvalho,Ivan Ricardo; Oliveira,Victoria Freitas de; Maia,Luciano Carlos da; Venske,EduardoAbstract: The objective of this work was to compare uni- and multivariate biometric methods to evaluate the adaptability and stability of an important group of white oat (Avena sativa) cultivars grown in Southern Brazil. The used experimental design was a randomized complete block, in a factorial arrangement of 12 environments x 7 cultivars, with three replicates. The analysis of variance and the methods of Ebe...
Heterosis and genetic distance in intervarietal corn hybrids
Baretta,Diego; Nardino,Maicon; Carvalho,Ivan Ricardo; Pelegrin,Alan Junior de; Ferrari,Mauricio; Oliveira,Victoria Freitas de; Szareski,Vinícius JardelAbstract: The objective of this work was to evaluate the performance of intervarietal corn (Zea mays) hybrids with topcross crosses between landrace populations, and to confirm whether genetic dissimilarity between populations is correlated with the heterosis of the intervarietal hybrids in the field. Nine topcross hybrids were evaluated with their tester 'BRS Planalto', and the following landrace populations w...
Can WRKY transcription factors help plants to overcome environmental challenges?
Finatto,Taciane; Viana,Vívian Ebeling; Woyann,Leomar Guilherme; Busanello,Carlos; Maia,Luciano Carlos da; Oliveira,Antonio Costa deAbstract WRKY transcription factors (TFs) are responsible for the regulation of genes responsive to many plant growth and developmental cues, as well as to biotic and abiotic stresses. The modulation of gene expression by WRKY proteins primarily occurs by DNA binding at specific cis-regulatory elements, the W-box elements, which are short sequences located in the promoter region of certain genes. In addition, t...
Dealing with iron metabolism in rice: from breeding for stress tolerance to bio...
Santos,Railson Schreinert dos; Araujo Júnior,Artur Teixeira de; Pegoraro,Camila; Oliveira,Antonio Costa deAbstract Iron is a well-known metal. Used by humankind since ancient times in many different ways, this element is present in all living organisms, where, unfortunately, it represents a two-way problem. Being an essential block in the composition of different proteins and metabolic pathways, iron is a vital component for animals and plants. That is why iron deficiency has a severe impact on the lives of differe...
Identification of variability for agronomically important traits in rice mutant...
Luz,Viviane Kopp da; Silveira,Solange Ferreira da Silveira; Fonseca,Gabriela Magalhães da; Groli,Eder Licieri; Figueiredo,Ricardo Garcia; Baretta,DiegoABSTRACT The increase of yield potential in new rice (Oryza sativa L.) varieties has been a major challenge for genetic improvement. The generation of mutants, followed by their characterization, constitutes a great possibility to isolate and select genes and genotypes that present agronomic traits of interest. This study aimed to evaluate the effect of chemical mutagen ethyl methane sulphonate (EMS) on agronom...
Rice genotypes for drought tolerance: morphological and transcriptional evaluat...
Madabula,Frederico Pedro; Santos,Railson Schreinert dos; Machado,Nata; Pegoraro,Camila; Kruger,Mariana Madruga; Maia,Luciano Carlos daABSTRACT Drought stress affects crop quality and productivity. The challenge of increasing food availability for a growing worldwide demand relies on the development of tolerant cultivars that will need to be adapted to arid and semi-arid areas. In order to help the understanding of rice response to stress, the phenotypic response of 6 Brazilian rice cultivars and 2 different crosses between them were character...
Heterosis and genetic parameters for grain quality in oat segregating populations
Silveira,Solange Ferreira da Silveira; Hawerroth,Maraisa Crestani; Oliveira,Danyela de Cássia da Silva; Woyann,Leomar GuilhermeABSTRACT Improvement of quality-related traits of grains is a constant concern in white oat breeding programs, which challenges breeders to understand their dynamics. The performance of different genetic combinations must be thoroughly evaluated to make high nutritional quality cultivars available. This study aimed to estimate the heterosis on F1 and F2 generations, vigor loss, due to inbreeding, and correlatio...
Stay-green: a potentiality in plant breeding
Luche,Henrique de Souza; Silva,José Antonio Gonzalez da; Maia,Luciano Carlos da; Oliveira,Antonio Costa deLooking at the new demands of the global agricultural scenario, the search for more productive, efficient and stress adapted genotypes has attracted attention of plant breeders regarding plants with improved physiological characteristics. Therefore, the stay-green trait has taken proeminence as an important strategy to overcome the current yield plateaus allied with yield adaptability and stability. This review...