Rice

Table 2 The effect of E-[CO ₂ ] on the percentage of grains categorized by appearance

From: Heat-tolerant rice cultivars retain grain appearance quality under free-air CO₂ enrichment

		Grain appearance category^B
Cultivar group^A	Cultivar (CV)	Undamaged		Cracked		Milky-white		Basal-white & White-Back		White-belly
		(%)		(%)		(%)		(%)		(%)
		FACE	AMB	FACE	AMB	FACE	AMB	FACE	AMB	FACE	AMB
ST	Akitakomachi	40.2	58.0	1.6	1.8	5.7	4.8	28.9	10.8	4.3	2.3
	Kinuhikari	68.7	72.5	0.5	0.9	3.3	2.9	8.0	4.1	1.5	2.0
	Koshihikari	68.4	74.7	1.2	1.4	3.0	2.0	9.8	5.1	1.9	1.5
	Nipponbare	52.9	60.8	0.4	0.2	10.4	6.6	12.8	6.9	5.3	2.4
	Matsuribare	28.2	42.4	0.1	0.0	15.4	8.8	26.2	15.2	7.6	4.4
HT	Mineharuka	68.2	71.3	0.1	0.2	3.4	2.1	5.6	2.6	1.1	0.9
	Toyama 80	71.9	75.6	4.1	4.1	2.8	2.1	3.9	1.3	1.4	1.8
	Eminokizuna	85.0	85.7	0.1	0.0	1.6	0.7	1.1	0.7	0.8	0.5
	Wa2398	80.4	82.7	0.3	0.2	1.7	1.2	3.2	1.3	1.6	1.2
	Kanto 257	74.2	76.1	0.2	0.1	2.8	2.0	3.6	1.7	2.0	1.8
	Kanto 259	55.7	57.6	0.2	0.1	8.0	5.8	8.3	4.5	4.3	2.4
	Saikai 290	63.8	65.3	0.7	0.6	5.4	4.1	5.2	2.6	6.2	4.8
	ST mean	51.7	61.7	0.8	0.9	7.6	5.0	17.1	8.4	4.1	2.5
	HT mean	71.3	73.5	0.8	0.8	3.6	2.6	4.4	2.1	2.5	1.9
12 cultivars mean		63.1	68.5	0.8	0.8	5.3	3.6	9.7	4.7	3.2	2.2
Source of variation	df	Statistical significance
Block	3
CO₂	1	P = 0.083		ns		*		*		*
Main plot error	3
CV^C	11	***		***		***		***		***
Group	1	***		*		***		***		***
ST^C	4	***		***		***		***		***
HT^C	6	***		***		***		***		***
CO₂ × CV	11	***		ns		P = 0.068		***		***
CO₂ × Group^D	1	***		ns		ns		***		*
CO₂ × ST^D	4	**		ns		**		***		***
CO₂ × HT^D	6	ns		ns		ns		ns		ns
Split plot error	66

^AST, standard cultivars; HT, heat-tolerant cultivars.
^BPercentage of grain number by appearance categorized by grain quality inspector.
^CSub-division of variation among the cultivars.
^DSub-division of variation among the CO₂ × CV interaction.
***P < 0.001; **P < 0.01; *P < 0.05; ns, not significant; values indicate 0.05 < P < 0.1.

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