Structural parameters for X-ray micro-computed tomography (μCT) and their relationship with the breakage rate of maize varieties

Table 3 Comparison of structural parameters of different varieties

Variety	Volume/mm³							Volume ratio/%						Weight/g
Variety	Grain	Endosperm	Embryo	Cavity	SC	EMC	ENC	Endosperm	Embryo	Cavity	SC	EMC	ENC	Grain
XY335	285.9ab	248.5ab	26.2b	11.2a	3.85ab	3.51a	3.80b	86.9ab	9.22ab	3.84a	1.34ab	1.20a	1.30b	0.346d
M751	280.6b	241.0b	29.8ab	10.3a	4.49ab	1.58a	4.29ab	86.0b	10.55a	3.65a	1.57ab	0.56a	1.53ab	0.356c
DH618	327.8a	282.5a	34.0a	11.0a	3.85ab	3.99a	3.15b	86.2b	10.43a	3.28a	1.20ab	1.14a	0.94b	0.382a
KX3564	283.7b	244.2b	26.3b	13.9a	5.86a	2.22a	5.79ab	86.1b	9.27ab	4.92a	2.10a	0.77a	2.05ab	0.323e
KX9384	305.5ab	272.8ab	24.9b	8.64a	1.35b	2.39a	5.03ab	89.3a	8.15b	2.81a	0.44b	0.79a	1.64ab	0.340d
LC808	295.5ab	251.2ab	30.3ab	14.3a	2.70ab	3.39a	8.20a	85.1b	10.26a	4.82a	0.91ab	1.15a	2.76a	0.364b

Variety	SA/mm²				SSA/mm⁻¹				Size/mm			AR	DE/g cm⁻¹	SP
Variety	Grain	Endosperm	Embryo	Cavity	Grain	Endosperm	Embryo	Cavity	Length	Width	Thickness	Grain	Grain	Grain
XY335	371.0b	699.6a	155.2b	280.3a	1.30a	2.80a	5.92a	26.2a	14.0a	8.05b	4.11b	1.73a	1.278a	0.565a
M751	409.4ab	693.6a	184.6ab	226.3a	1.46a	2.87a	6.30a	21.4a	14.0a	7.85c	4.21b	1.79a	1.198ab	0.510a
DH618	454.6a	788.6a	207.0a	262.6a	1.39a	2.79a	6.09a	24.6a	14.2a	8.62abc	4.84a	1.65ab	1.175ab	0.507a
KX3564	406.3ab	777.3a	175.4b	296.3a	1.44a	3.21a	6.67a	21.7a	14.1a	8.36abc	4.07b	1.69a	1.140b	0.514a
KX9384	429.0ab	722.2a	151.0bc	236.7a	1.41a	2.66a	6.10a	27.4a	12.9b	8.89a	4.41ab	1.46b	1.177ab	0.513a
LC808	404.8ab	808.2a	176.6ab	339.3a	1.37a	3.22a	5.85a	24.8a	13.8a	8.79ab	4.33b	1.58ab	1.233ab	0.530a

SC, EMC, ENC, AR, DE, and SP stand for subcutaneous cavity, embryo cavity, endosperm cavity, aspect ratio, density, and Sphericity respectively. Mean in the same column followed by different lower case letters indicate a significant difference (P < 0.05). All data above was also showed by figure in the Additional file 1

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