Lodging Resistance of Japonica Rice (Oryza Sativa L.): Morphological and Anatomical Traits due to top-Dressing Nitrogen Application Rates

Rice

Table 3 Correlation analysis between the physical parameters and the morphological and anatomical characteristics in japonica rice

Index	Wuyunjing23		W3668
Index	LI	M	LI	M
Breaking strength (g.cm)	−0.987^b	−	−0.938^b	−
Plant height (cm)	0.578	−0.576	0.153	−0.071
Gravity centre height (cm)	0.588	−0.495	0.623	−0.429
Culm diameter (mm)	0.455	−0.440	0.725^a	−0.586
Culm wall thickness (mm)	0.253	−0.164	−0.541	0.557
b₁ (mm)	0.355	−0.311	0.800^b	−0.671^a
a₁ (mm)	0.432	−0.405	0.934^b	−0.798^b
b₂ (mm)	0.834^b	−0.816^b	0.795^a	−0.647^a
a₂ (mm)	0.522	−0.512	0.484	−0.599
No. of large vascular bundles	0.155	−0.173	−0.486	0.322
Area of large vascular bundles (μm²)	−0.803^b	0.819^b	−0.666	0.707^a
No. of small vascular bundles	−0.322	0.319	−0.12	−0.052
Area of small vascular bundles (μm²)	−0.870^b	0.820^b	−0.644	0.535
No. of air chambers	0.064	−0.100	0.074	−0.086
Area of air chambers (μm²)	0.401	−0.351	0.668^a	−0.679^a
Thickness of mechanical tissue (μm)	−0.759^a	0.770^a	−0.937^b	0.936^b

Abbreviations: LI lodging index, M breaking strength, a ₁ and a ₂ the outer and inner diameters of the minor axis in an oval cross-section, respectively, b ₁ and b ₂ the outer and inner diameters of the major axis in an oval cross-section, respectively
^{a, b} Means significant at the 0.05 and 0.01 probability levels, respectively