Implications of the clone by harvest interaction in the selection of sugarcane genotypes in a regionalized program

Abstract

ABSTRACT. The recommendation of sugarcane clones depends on several factors, as the response or performance of the clones over different cuts or harvests. The clone by harvest interaction might be difficult to identify superior clones in the final stages of the sugarcane breeding program. Thus, the objective of this study was to investigate and describe the implications of the genotype by harvest interaction in the adaptability and stability of genotypes and delineation of mega-environments from a set of multi-environment trials. Fifteen clones and four checks were evaluated in eight environments. The trait TPH (tons of pol per hectare) was evaluated in two harvests (plant cane and ratoon cane) in 2010 and 2011. The joint analysis showed significance for harvest (H), environment (E), and genotype (G) effects. The interactions GxE, ExH, GxH, and ExGxH were also significant. The last three-way interaction indicated the differential response of the genotypes over environments, and that it depends on the harvests. The overall mean of the trials was 12.77 TPH. The coefficient of variation was 8.70% and the selective accuracy was 98.63%, indicating high experimental precision. The genotypes G4, G14, and G16 were statistically superior to the check varieties used; however, these genotypes did not show high stability as described by the additive main effects and multiplicative interaction method. There was a specific adaptation between the E7 and E5 environments and the G4 and G5 genotypes, respectively. In general, the grouping of the environments was inconsistent throughout the harvests, except for the E1 and E4 environments, which exhibited similarities for the different genotypes.

Yields of Promising Sugarcane Clones under Three Different Planting Arrangements

“…Further research is needed to strengthen the recommendations for the promising clones included in this work; high and stable yields have been attained in PC and RC-1. Cabral et al (2017) suggested assessing the genotypes in several cuts or harvests, despite high results and stability in diverse environments. Varieties with early maturity, very tolerant of drought, accompanied by high cane and sugar yields, provide options for early planting in Indonesia.…”

Nutritional Requirement of Sugarcane Cultivars

“…This fact is possibly related to the genetic aspects of the cultivars and the interactions of the genotypes with the environment in which they are inserted (Silva et al, 2017c). Inherent factors such as sprouting, cane-age, and root activity may affect productivity decrease (Manhães et al, 2015;Cabral et al, 2017). In addition to environmental attributes such as luminosity, availability of water and mineral nutrients that can negatively influence sugarcane yield (Silva et al, 2017a).…”

Water use efficiency of sugarcane clones under rainfed condition

“…This ETc was comparable to the mean ETc in two seasons computed by [21,22], ranging from 1399 mm/year (0% water deficit) and 1160 mm (30% water deficit) in the semiarid region. Annual sugarcane evapotranspiration was in the ranges of 1023.9 -1068.5 mm in Brazil [23], 1231.5 mm average from nine seasons [24], 1645 mm [25], 829 mm (PC), and 685 mm (RC) in Southeast Brazil [11]. The other related researches also informed 1369.84 mm in Myanmar [26], 1450 mm in Bundaberg, Australia [13], 1100-1960 mm in many sites in Australia [19], 1542-1964 mm in Hawaii [27].…”