Melhoramento genético para tolerância ao frio em arroz irrigado

Cruz, Renato Souza; Milach, Sandra Cristina Kothe

doi:10.1590/s0103-84782000000500031

Cited by 52 publications

(75 citation statements)

References 16 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, because each characteristic makes its contribution to the variability of an individual and no characteristic alone is responsible for total variation, the elimination of less informative descriptors should facilitate interpretations without causing substantial loss of information and ensure reductions in required resources, contributing to more accurate measurement of the most important traits for morphological characterization [18]. In this study, not all the IPGRI descriptors selected for morphological evaluation were useful for discrimination purposes.…”

Section: Discussionmentioning

confidence: 90%

Morphological diversity of mango germplasm from the upper athi river region of eastern Kenya: An analysis based on non- fruit descriptors

Toili¹,

Rimberia²,

Nyende³

et al. 2016

AJFAND

View full text Add to dashboard Cite

Phenotypic variation in plants can be evaluated by morphological characterization using visual attributes. Fruits have been the major descriptors for identification of different varieties of fruit crops. However, even in their absence, farmers, breeders and interested stakeholders require to distinguish between different mango varieties. This study aimed at determining diversity in mango germplasm from the Upper Athi River (UAR) and providing useful alternative descriptors for the identification of different mango varieties in the absence of fruits. A total of 20 International Plant Genetic Resources Institute (IPGRI) descriptors for mango were selected for use in the visual assessment of 98 mango accessions from 15 sites of the UAR region of eastern Kenya. Purposive sampling was used to identify farmers growing diverse varieties of mangoes. Evaluation of the descriptors was performed on-site and the data collected were then subjected to multivariate analysis including Principal Component Analysis (PCA) and Cluster analysis, one-way analysis of variance (ANOVA) and Chi square tests. Results classified the accessions into two major groups corresponding to indigenous and exotic varieties. The PCA showed the first six principal components accounting for 75.12% of the total variance. A strong and highly significant correlation was observed between the color of fully grown leaves, leaf blade width, leaf blade length and petiole length and also between the leaf attitude, color of young leaf, stem circumference, tree height, leaf margin, growth habit and fragrance. Useful descriptors for morphological evaluation were 14 out of the selected 20; however, ANOVA and Chi square test revealed that diversity in the accessions was majorly as a result of variations in color of young leaves, leaf attitude, leaf texture, growth habit, leaf blade length, leaf blade width and petiole length traits. These results reveal that mango germplasm in the UAR has significant diversity and that other morphological traits apart from fruits can be useful in morphological characterization of mango.

show abstract

Section: Discussionmentioning

confidence: 90%

Morphological diversity of mango germplasm from the upper athi river region of eastern Kenya: An analysis based on non- fruit descriptors

Toili¹,

Rimberia²,

Nyende³

et al. 2016

AJFAND

View full text Add to dashboard Cite

show abstract

“…The less representative features in the genetic diversity of the studied populations were BH, AAD, PdL, and IOW, which displayed the highest coefficients in the canonic variable of lowest importance (CV2, Table 2). Less important characters are either invariant or redundant, i.e., they are represented by other highly correlated characters (individually or grouped) (Cruz and Carneiro, 2003).…”

Section: Morphometric Analysesmentioning

confidence: 99%

“…According to Cruz and Carneiro (2003), such studies must include a number of variables to explain, at least, 80% of the observed variation. In the present work, the first two canonic variables were sufficient to evaluate the morphometric differentiation among populations, since, together, they explained 100% of the original variation.…”

Section: Morphometric Datamentioning

confidence: 99%

Cytogenetic and morphological diversity in populations of Astyanax fasciatus (Teleostei, Characidae) from Brazilian northeastern river basins

et al. 2008

View full text Add to dashboard Cite

In the present work, morphometric and cytogenetic analyses were carried out in populations of the fish Astyanax fasciatus (Characidae) from Contas and Recôncavo Sul River basins (State of Bahia, Brazil), providing new data on the genetic structure of this species along the region. Based on morphologic measurements, we observed that populations from the same hydrographic basin were more similar to each other (Contas and Preto do Costa Rivers), and remarkably divergent from Recôncavo Sul (Mineiro Stream), as indicated by clustering analysis. Cytogenetic data revealed a same diploid number for all populations (2n = 48), but distinct karyotype formulae (8M+24SM+12ST+4A, FN = 92 in Contas River, 8M+24SM+10ST+6A, FN = 90 in Preto do Costa River, and 8M+18SM+16ST+6A, FN = 90 in Mineiro Stream). Ag-NORs were identified at telomeres on a subtelocentric chromosome pair, although multiple ribosomal sites have been detected in some specimens from Contas River. These results show that A. fasciatus populations from northeastern river basins are well differentiated and present peculiar cytogenetic features when compared to populations from other regions. Therefore, the apparent chromosomal plasticity of this species, likely to represent a complex of cryptic forms, is corroborated. Finally, we demonstrated that morphological features can be successfully used to support other sources of genetic information.

show abstract

“…No período reprodutivo, os sintomas de dano pelo frio são má inserção da panícula, esterilidade e manchas nas espiguetas (SOUZA, 1990). CRUZ & MILACH (2000), em um estudo de capacidade Médias seguidas por diferentes letras na coluna diferem entre si, pelo teste de Scott-Knott, a 5% de probabilidade.…”

Section: Results Of the First Count Test (G1) Final Count Of The Gerunclassified

Caracterização da qualidade fisiológica de sementes de arroz-crioulo da safra de 2010/2011

Coelho¹,

Pollak²,

Souza³

et al. 2014

Científica

View full text Add to dashboard Cite

Melhoramento genético para tolerância ao frio em arroz irrigado

Cited by 52 publications

References 16 publications

Morphological diversity of mango germplasm from the upper athi river region of eastern Kenya: An analysis based on non- fruit descriptors

Morphological diversity of mango germplasm from the upper athi river region of eastern Kenya: An analysis based on non- fruit descriptors

Cytogenetic and morphological diversity in populations of Astyanax fasciatus (Teleostei, Characidae) from Brazilian northeastern river basins

Caracterização da qualidade fisiológica de sementes de arroz-crioulo da safra de 2010/2011

Contact Info

Product

Resources

About