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- 저자 : Venske Eduardo (검색결과 3 건)
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Thurow Liamara Bahr,da Silva Raíssa Martins,Venske Eduardo,Ceolin Guilherme Paim,de Oliveira Victoria Freitas,Stülp Cristiano,Figueiredo Ricardo Garcia,Tessmann Elisane Weber,da Maia Luciano Carlos,de 한국작물학회 2024 Journal of crop science and biotechnology Vol.27 No.2
Although genomic tools have proven to be very useful for plant breeding, most bread wheat breeding programs at developing countries still rely solely on phenotypic selection. Controversially, applied studies on this theme are gradually becoming scarce worldwide, especially the ones focusing on specifc traits, such as plant height and spike number. The present study aimed to depict the genetic efects of selecting for both decrease and increase of plant height and spike number on a set of Brazilian wheat populations at early segregating generations, bringing information for the development of efective breeding strategies. Five populations in F2 were subjected to fve selection criteria, including no selection. Eight agronomic traits were assayed. Plant height has shown the highest broad-sense heritability coefcients, selection diferentials, selection gain estimates, and real selection gains. On the other hand, the means for spike number for these parameters were low to moderate. Selection for these traits impacted on indirect selection gains for all other traits. Early selection for increasing both plant height and spike number per plant has positive efects on grain yield per plant and its components on the segregating populations assayed, according to selection gain estimates. The present germplasm does not allow for further plant shortening without losing yield potentia
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An optimized index for cold tolerance assessment in rice during germination and early seedling stage
Monzón Daisy Leticia Ramirez,Cantero Jorge,Danielowski Rodrigo,da Luz Viviane Kopp,Venske Eduardo,Mota Monalize Salete,da Silva Raissa Martins,de Oliveira Victoria Freitas,de Oliveira Antonio Costa,de 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.2
Cold tolerance at germination and seedling stage is one of the most seeked traits in Southern Brazilian rice (Oryza sativa L.) cultivars, thus, the availability of improved methods for germplasm assessment is of high importance for breeding programs. The aim of this study was to validate an optimized Average Tolerance Index (ATI) for rice germplasm assessment under cold at germination and early seedling stage. A diverse panel composed by 124 rice accessions was assayed. Four genotypes with known performance under cold were used as controls (two tolerant and two sensitive). The genotypes were sown in roll papers, and evaluated at 13 °C for 28 days (cold stress) and 25 °C for seven days (control). Four traits were measured, germination percentage, coleoptile length, root length and shoot length, which were converted in terms of relative perfor‑ mance (cold/control). A PCA analysis was carried out. The ATI was calculated as a linear combination of all trait’s relative performance, weighted by the importance of each trait in explaining the genetic variability in the set, through including the PC1 vectors as trait coefcients. K means was applied for genotype classifcation. The panel showed expressive genetic variability for performance under low temperature. The ATI successfully distinguished the controls regarding their cold tolerance and allowed the formation of four classes of genotypes, sensitive, moderately sensitive, moderately tolerant and tolerant. The assessment of rice germplasm for cold tolerance at germination and seedling stage through ATI is a viable alternative for the identifcation of tolerant genotypes.
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Fernandes Rebeca Catanio,Busanello Carlos,Viana Vívian Ebeling,Venske Eduardo,de Oliveira Victoria Freitas,Lopes Jennifer Luz,da Maia Luciano Carlos,Costa de Oliveira Antonio,Pegoraro Camila 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.3
Wheat is a staple food for a large part of the world's population and faces a continuous demand for increased productivity. The presence of genetic variability allows the success in developing cultivars with higher yield. The understanding of the genetic variability available is crucial for their efective use in breeding programs. Inheritance of wheat yield components is complex, due to polygenic control and the strong infuence of the environment. Therefore, an accurate heritability estimation can accelerate the selection gains towards increasing wheat yield. Thus, this study aimed to characterize agronomic traits related to yield in a collection of 99 wheat accessions used in Brazil. In addition, the heritability of these traits was estimated. The studied accessions showed variability for yield, which can be explained by the presence of variability in most yield components. Cluster analysis showed that there is variability in wheat genotypes, however, the introduction of new sources of variability in crossing blocks or the induction of mutations is suggested. The broad-sense heritability for grain yield was considered high, as well as for most of the studied agronomic traits, suggesting that it is possible to obtain genetic gain with selection in this environment. However, for greater accuracy, genetic gain values should be estimated and considered when designing selection strategies. Hectoliter weight showed low heritability, demonstrating the complexity of selection for this trait. In summary, this study demonstrates the presence of genetic variability and high heritability for agronomic traits, enabling genetic gain in breeding programs using these wheat accessions.
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