Genetic distance between parental lines used for 6×6 incomplete diallel crosses.

P1 to P6: maternal parents; P7 to P12: paternal parents.P1, P2, P3, P7, and P8: cultivars (P1: ZS5; P2: ZS7; P3: ZS10; P7: ZS9; P8: HS5). P4 to P6, and P9 to P12: inbred lines.See also Table S1 for detailed characteristics of the parental lines.P1至P6为母本亲本（maternal parents），P7至P12为父本亲本（paternal parents）。其中P1、P2、P3、P7与P8为栽培品种（cultivars），具体如下：P1为ZS5，P2为ZS7，P3为ZS10，P7为ZS9，P8为HS5。P4至P6以及P9至P12均为自交系（inbred lines）。亲本系的详细特征详见补充表S1（Table S1）。