Genetic Variability in Phosphorus Responses of Rice Root Phenotypes

Rice

Table 3 The effects of axial position and genotype on anatomical traits

	d.f.	TCA (mm²)		AA (mm²)		%AA		LCA (mm²)
		F	P	F	P	F	P	F	P
Axial Position (AP)	3	1.450	0.230	56.266	<0.001	188.553	<0.001	14.923	<0.001
Genotype	14	29.891	<0.001	6.997	<0.001	0.923	0.535	10.088	<0.001
AP*Genotype	42	7.224	<0.001	2.181	0.001	3.138	<0.001	7.947	<0.001
Axial Positions		Mean	SE	Mean	SE	Mean	SE	Mean	SE
5 cm		0.768a	0.038	0.072a	0.063	8.61a	0.92	0.696c	0.032
10 cm		0.813a	0.042	0.253b	0.109	30.88b	0.84	0.559b	0.029
15 cm		0.792a	0.045	0.349c	0.120	44.87c	0.93	0.443a	0.030
base		0.706a	0.026	0.213b	0.108	29.72b	1.53	0.493ab	0.020
		TSA (mm²)		MXV		MXA (mm²)		WC (m⁴ · 10⁻²⁰)
		F	P	F	P	F	P	F	P
AP	3	0.807	0.492	3.489	0.017	4.833	0.003	3.459	0.018
Genotype	14	47.401	<0.001	26.655	<0.001	21.634	<0.001	32.137	<0.001
AP*Genotype	42	4.167	<0.001	7.267	<0.001	3.619	<0.001	5.683	<0.001
Axial Positions		Mean	SE	Mean	SE	Mean	SE	Mean	SE
5 cm		0.072a	0.004	5.02a	0.178	0.0015b	0.000077	149.18b	18.075
10 cm		0.081a	0.005	5.20a	0.200	0.0016b	0.000081	162.92b	19.669
15 cm		0.076a	0.004	5.36ab	0.163	0.0015b	0.000080	161.78b	20.938
base		0.074a	0.003	5.82b	0.191	0.0012a	0.000058	94.27a	8.091

Analysis of variance, means and standard errors (SE) are shown for total cortical area (TCA), aerenchyma area (AA), percent aerenchyma (%AA), living cortical area (LCA), total stele area (TSA), number of late-metaxylem vessels (MXV), median area of the late-metaxylem vessels (MXA), and water conductance (WC) measured at 5, 10 and 15 cm from the root apex and at 1 cm from the root base. Letters indicate significant differences among axial positions by the least significant difference (LSD) test (P < 0.05)