Fig. 2

Diagrams showing phenotypes of the six segregant bulks with phenotype extremes for tolerant or sensitive hybrids (a) and common QTLs on chromosome 16 (b) for salt, alkali, and salt–alkali injury indices identified using bulked segregant analysis by sequencing F1 hybrids of Malus robusta Rehd. ‘Baleng Crab (BC)’ × M. pumila Mill. ‘M9’ rootstocks. In panel B, the Y-axis represents the G’ value and the X-axis represents the physical position on the chromosome. The red curved lines: ‘M9’; blue curved lines: ‘BC’; black curved lines: ‘BC’ & ‘M9’. The colored horizontal lines indicate the corresponding statistically significant threshold of the G’ value