Saccharum spp

Genetic divergence of sugarcane varieties collected in the region of Lavras, Minas Gerais, Brazil

L. E. V. Cesar, Bruzi, A. T., Nunes, J. A. R., Andrade, L. Ade B., Lopes, M. F., Sales, L. R., and Mourão, M. M., “Genetic divergence of sugarcane varieties collected in the region of Lavras, Minas Gerais, Brazil”, vol. 14, pp. 14043-14049, 2015.

Genetic diversity among local accessions and varieties subsidize plant breeding programs, allowing the utilization of existing variability in plants that have already adapted to local climate conditions. An alternative to studying genetic variability is the study of diversity. The aim of this research was to study genetic diversity among sugarcane accessions and varieties used for the production of craft-distilled cachaça (distilled sugarcane alcohol) in the region of Lavras, Minas Gerais, Brazil.

Differential gene expression in drought-tolerant sugarcane roots

J. S. Vantini, Dedemo, G. C., Gimenez, D. F. Jovino, Fonseca, L. F. S., Tezza, R. I. D., Mutton, M. A., Ferro, J. A., and Ferro, M. I. T., “Differential gene expression in drought-tolerant sugarcane roots”, vol. 14, pp. 7196-7207, 2015.

Drought is one of the most frequent abiotic stresses limiting the productivity and geographical distribution of sugarcane culture. The use of drought-tolerant genotypes is one approach for overcoming the effects of water stress. We conducted a comparative study to identify gene expression profiles under water stress in tolerant sugarcane roots. Two different cultivars, 1 drought tolerant (RB867515) and 1 drought susceptible (SP86-155), were evaluated at 4 sampling time points (1, 3, 5, and 10 days) using the cDNA-amplified fragment length polymorphism technique.

Flow cytometry reliability analysis and variations in sugarcane DNA content

A. C. L. Oliveira, Pasqual, M., Bruzi, A. T., Pio, L. A. S., Mendonça, P. M. S., and Soares, J. D. R., “Flow cytometry reliability analysis and variations in sugarcane DNA content”, vol. 14, pp. 7172-7183, 2015.

The aim of this study was to evaluate the reliability of flow cytometry analysis and the use of this technique to differentiate species and varieties of sugarcane (Saccharum spp) according to their relative DNA content. We analyzed 16 varieties and three species belonging to this genus.

Genetic diversity in sugarcane varieties in Brazil based on the Ward-Modified Location Model clustering strategy

B. P. Brasileiro, Marinho, C. D., Costa, P. M. A., Moreira, E. F. A., Peternelli, L. A., and Barbosa, M. H. P., “Genetic diversity in sugarcane varieties in Brazil based on the Ward-Modified Location Model clustering strategy”, vol. 13, pp. 1650-1660, 2014.

We evaluated the genetic diversity of 77 clones of sugarcane used in crosses made by the Brazilian interuniversity network for the development of the sugar/energy sector (RIDESA) breeding program. Characterization of the genotypes was carried out at the ratoon stage, based on eight morphological traits and seven agronomic traits. Diversity analysis was carried out beginning with the Ward-Modified Location Model. The ideal number of groups was three. Groups 1, 2, and 3 were composed of 37, 21, and 19 accessions, respectively.

Selfing rate estimation in sugarcane under unfavorable natural conditions of crossing by using microsatellite markers

M. L. G. Melloni, Scarpari, M. S., Pinto, L. R., Perecin, D., Xavier, M. A., and Landell, M. G. A., “Selfing rate estimation in sugarcane under unfavorable natural conditions of crossing by using microsatellite markers”, vol. 13, pp. 2278-2289, 2014.

The self-fertilization or selfing rate estimation using microsatellite markers and its impact on survival and selection rate were evaluated in families derived from polycrosses that involved parents that were widely used in sugarcane breeding in Brazil. These factors were evaluated under unfavorable natural conditions of flowering and crossing. After the germination test, the viable progeny were taken to the field for survival rate evaluation (4, 6, and 10 months) and phenotypic selection at plant cane.

Relationships between methods of variety adaptability and stability in sugarcane

T. O. Mendes de Paula, Marinho, C. D., Souza, V., Barbosa, M. H. P., Peternelli, L. A., Kimbeng, C. A., and Zhou, M. M., “Relationships between methods of variety adaptability and stability in sugarcane”, vol. 13, pp. 4216-4225, 2014.

The identification and recommendation of superior genotypes is crucial for the growth of industrial crops, and sugarcane breeding performs a vital role by developing more productive cultivars. The study of genotype x environment interaction has been an essential tool in this process. Thereby, the purpose of this study was to investigate the relationship between methods of adaptability and stability in sugarcane. Data were collected from trials using a randomized block design with three repetitions and 15 clones of sugarcane in nine environments in the State of Minas Gerais, Brazil.

Phenotype adaptability and stability of sugarcane genotypes in the sugarcane belt of the State of Pernambuco, Brazil

J. A. Dutra Filho, Junior, T. C., and Neto, D. E. Simões, “Phenotype adaptability and stability of sugarcane genotypes in the sugarcane belt of the State of Pernambuco, Brazil”, vol. 13, pp. 6865-6877, 2014.

We assessed the agroindustrial performance of 25 sugarcane genotypes adapted to the edaphoclimatic conditions of the State of Pernambuco, Brazil, within the microregions Mata Norte, Mata Sul, Região Central, Litoral Norte, and Litoral Sul. The variables analyzed were POL tonnage per hectare, sugarcane tonnage per hectare, fiber and total recoverable sugar tonnage per hectare, using a randomized block design with four repetitions.

Selfing confirmation in sugarcane by using simple sequence repeat markers: an individual reciprocal recurrent selection scheme

P. M. A. Costa, Almeida, C. F., Silveira, G., Soares, B., Baffa, D. C. F., Peternelli, L. A., Bhering, L. L., and Barbosa, M. H. P., “Selfing confirmation in sugarcane by using simple sequence repeat markers: an individual reciprocal recurrent selection scheme”, vol. 13, pp. 8962-8970, 2014.

Superior inbred clones selected in S1 families can integrate an individual reciprocal recurrent selection program in sugarcane by eliminating the genetic load of the population and exploring superior hybrid combinations. Molecular markers can be used for reliable identification of the true selfing-derived clones in these S1 populations.

A proposed model for the flowering signaling pathway of sugarcane under photoperiodic control

C. P. Coelho, Netto, A. P. Costa, Colasanti, J., and Chalfun-Júnior, A., “A proposed model for the flowering signaling pathway of sugarcane under photoperiodic control”, vol. 12, pp. 1347-1359, 2013.

Molecular analysis of floral induction in Arabidopsis has identified several flowering time genes related to 4 response networks defined by the autonomous, gibberellin, photoperiod, and vernalization pathways. Although grass flowering processes include ancestral functions shared by both mono- and dicots, they have developed their own mechanisms to transmit floral induction signals. Despite its high production capacity and its important role in biofuel production, almost no information is available about the flowering process in sugarcane.

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