Greenhouse and field trials
Overall, the experiments showed a low mean incidence of mosaic disease in the greenhouse conditions, with symptoms observed in only 9 of 79 sugarcane genotypes with no effects of evaluation and genotype × evaluation interaction. Despite this result, a significant difference among genotypes and between blocks was observed. The significant interaction between genotypes and blocks revealed that some genotypes had different behaviors between blocks (Table 1). The most susceptible genotypes, as defined by the LSD test (P = 0.05), are shown in Table 2.
The variance analysis for mosaic symptom grades observed in the field conditions showed significant F values (P = 0.01) for replicates within a block and genotype, indicating that plants of the same genotype demonstrated different behavior in their expression of mosaic symptoms, contributing to environmental variance ( Table 1). The mosaic incidence and symptom grade mean were elevated in the field assay compared to the greenhouse conditions, with 40 of 79 genotypes showing mosaic symptoms in at least one evaluation. The higher mean allowed for improved observation of the different behaviors among genotypes, which can be demonstrated through the significant effects of evaluation and their interaction with genotypes. The Split plot temporal arrangement allowed for the observation of genotype behavior during the evaluations and for the estimation of genetic variance free from interaction variance. The most susceptible genotype, as measured by the LSD test (P = 0.05), was RB925211, followed by IACSP96-1066 ( Table 2).
Greenhouse and field trialsOverall, the experiments showed a low mean incidence of mosaic disease in the greenhouse conditions, with symptoms observed in only 9 of 79 sugarcane genotypes with no effects of evaluation and genotype × evaluation interaction. Despite this result, a significant difference among genotypes and between blocks was observed. The significant interaction between genotypes and blocks revealed that some genotypes had different behaviors between blocks (Table 1). The most susceptible genotypes, as defined by the LSD test (P = 0.05), are shown in Table 2.The variance analysis for mosaic symptom grades observed in the field conditions showed significant F values (P = 0.01) for replicates within a block and genotype, indicating that plants of the same genotype demonstrated different behavior in their expression of mosaic symptoms, contributing to environmental variance ( Table 1). The mosaic incidence and symptom grade mean were elevated in the field assay compared to the greenhouse conditions, with 40 of 79 genotypes showing mosaic symptoms in at least one evaluation. The higher mean allowed for improved observation of the different behaviors among genotypes, which can be demonstrated through the significant effects of evaluation and their interaction with genotypes. The Split plot temporal arrangement allowed for the observation of genotype behavior during the evaluations and for the estimation of genetic variance free from interaction variance. The most susceptible genotype, as measured by the LSD test (P = 0.05), was RB925211, followed by IACSP96-1066 ( Table 2).
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