Abstract
ABSTRACT: The purpose of this study was to select cold-tolerant sugarcane families and clones. Evaluations were carried out during three selection phases in the municipality of Pelotas, state of Rio Grande do Sul, Brazil. The experiments were arranged in an incomplete block design, with initially 4,452 seedlings of 53 full-sib families. Aside from the traits soluble solids content (BRX), tons of stalks per hectare (TSH) and tons of brixper hectare (TBH), the survival of the apical bud (ABS) was evaluated in the first selection stage (T1) of the breeding program. At the end of three selection phases, 15 clones of 14 of the 53 families evaluated in the first phase (T1) were selected for the experimental phase. Of these, the clones RS/PR126066, RS/PR126044, RS/PR126052, RS/PR126007 and RS/PR126033, had a good performance for apical bud survival in the first selection phase.
Highlights
Sugarcane is mostly cultivated in regions with a tropical climate, it is estimated that in 25% of the producing countries it is planted in areas where low temperatures can damage the crop and, cause economic losses (HALE et al, 2016)
The demand for studies involving varietal tolerance to address abiotic stresses has increased in recent years
The parameters estimated for the traits evaluated in this phase (Table 1) indicated the possibility of genetic gains for the traits evaluated with selection among and within families, with regard to apical bud survival (ABS), for which high heritability with an accuracy>0.80 in the family selection was observed (Table 1)
Summary
Sugarcane is mostly cultivated in regions with a tropical climate, it is estimated that in 25% of the producing countries it is planted in areas where low temperatures can damage the crop and, cause economic losses (HALE et al, 2016). A second alternative would be cold-tolerant varieties, which are not widely used in Brazil due to the low availability. This deficiency is a consequence of the lack of evaluations of the cold response of the currently available varieties for planting. Cold or frost tolerance tests of promising sugarcane varieties and clones are commonly performed in Australia, Canada, the United States of America and South Africa (FRIESEN et al, 2014; HALE et al, 2016; HEERDEN et al, 2010; WEAICH et al, 1993)
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