Abstract
Abstract Multilocation experiments are the steps to determine the genotype stability being tested. Honey sweet potato is a superior agricultural product from West Java, Indonesia. High yield and sweetness are the important traits of the new honey sweet potato breeding lines. In this study, the sweetness level used was the soluble solid level (°brix). The goals of this study were to determine the effects of genotype by environment interactions (GEIs) and to select for storage root yield stability and sweetness among the new promising honey sweet potato lines. Field trials have been carried out using randomized completed block design, which was repeated thrice for the 16 genotypes, across six locations in West Java, Indonesia. To estimate GEIs, data were analyzed using combined analysis of variance. Storage root yield stability (t/ha) and sweetness (°brix) were estimated using parametric measurements, nonparametric measurements, and GGE biplot. The results showed that the genotype (G), environment (E), and GEIs have significant influences on storage root yield and sweetness. Two genotypes, SP3 and SP16, have been identified as the most stable ones with high yield and sweetness across several locations. These two superior genotypes are recommended as potential new honey sweet potato varieties for West Java, Indonesia.
Highlights
Sweet potato is one of the tuber crops that plays an important role in Indonesia
The greatest contribution was from environmental factor (40.61%), while for sweetness, genotype by environment interactions (GEIs) showed the greatest contribution with a value of 36.46%. These results indicate that the high degree of variation for storage root yield and sweetness on honey sweet potato evaluated across six locations ranging from 3.78 to 16.73 t/ha for storage root yield, and 7.24–10.48 °brix for sweetness
This study shows that the G, E, and GEIs significantly affected storage root yield and sweetness
Summary
Sweet potato is one of the tuber crops that plays an important role in Indonesia. Sweet potato starch has suitable characteristics for industrial materials (Grüneberg et al 2015; Waluyo et al 2015). The high starch content of sweet potato makes it a good source of bioethanol (Ziska et al 2009; Waluyo et al 2015; Lareo and Ferrari 2018). West Java is the largest area for sweet potato cultivation in Indonesia. It has the highest demand for sweet potato for both domestic and export markets. Because of its many uses and economic value, sweet potato is considered as one of the most economically important crops for West Java
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