Screening of Sapindus germplasm resources in China based on agro-morphological traits

Sapindus L. species are widely cultivated for biodiesel, biomedical, and biochemical raw materials in southern China. However, yields fluctuate widely due to the lack of high-yielding, high-quality, stable cultivars. Therefore, the objectives of this study were to evaluate three species and one variety among 149 nationwide Sapindus species and screen for elite accessions which would serve as Sapindus breeding materials. Accessions were evaluated on 19 agro-morphological traits by correlation analysis and principal component analysis. These displayed substantial diversity and a broad range of economic traits. In particular, accessions of Sapindus mukorossi and Sapindus rarak had more variation in economic traits than Sapindus delavayi and Sapindus rarak var. velutinus. Increased saponin accumulation may be achieved at the cost of seed oil production. Thirty elite accessions for oil and saponin production, and for comprehensive utilization were screened and accessions no. 80, 110, and 112 had significant potential to produce high yields. These elite accessions will facilitate the identification of genetic determinants of valuable traits and the effective utilization of trait variability in Sapindus breeding.