Fig. 4

Correlation analysis of grain morphology and structural parameters with breakage rate. From left to right: A: Density (− 0.934**); B: Sphericity (− 0.714*); C: The cavity specific surface area (− 0.628*); D: Embryo cavity volume ratio (− 0.551); E: Embryo cavity volume (− 0.436); F: Grain weight (− 0.371); G: Cavity surface area (− 0.138); H: Endosperm volume ratio (− 0.063); I: Endosperm cavity volume (− 0.049); J: Embryo volume ratio (− 0.015); K: Endosperm volume ratio (− 0.014); L: Endosperm volume (− 0.004). M: Thickness (0.001); N: Width (0.007); O: Embryo volume (0.011); P: Grain volume (0.013); Q: Cavity volume (0.057); R: Aspect ratio (0.087); S: Cavity volume ratio (0.209); T: Length (0.249); U: Endosperm surface area (0.288); V: The Endosperm specific surface area (0.308); W: Embryo surface area (0.374); X: Grain surface area (0.431); Y: Subcutaneous Cavity volume ratio (0.581*); Z: Subcutaneous Cavity volume (0.589*); Z1: Grain specific surface area (0.758*); Z2: Embryo specific surface area (0.927**)