Table 1.

The rate of leaf photosynthesis (P_n), stomatal conductance (g_s), leaf nitrogen content (N content), leaf water potential (Ψ₁), and effects of the polyethylene bag treatment of leaves on the rate of leaf photosynthesis [Poly(P_n)] and stomatal conductance [Poly(g_s)] in Takanari and Koshihikari grown in 3.0 l pots at the tillering and heading stages

Growth stage	Variety	Pn (μmol m−2 s−1)	gs (mol m−2 s−1)	Poly(Pn) (μmol m−2 s−1)	Poly(gs) (mol m−2 s−1)	N content (g m−2)	Ψ1
Tillering	Takanari (A)	30.4±1.0	0.97±0.10	30.1±2.4	0.97±0.19	1.60±0.07	–0.25±0.02
	Koshihikari (B)	30.8±0.5	0.79±0.04	29.6±3.5	1.08±0.40	1.77±0.03	–0.26±0.02
	A/B	0.99	1.23	1.02	0.90	0.91	0.95
		NS	*	NS	NS	*	NS
Heading	Takanari (A)	19.1±0.7	0.78±0.16	19.1±1.3	0.89±0.07	1.26±0.07	–0.18±0.03
	Koshihikari (B)	16.5±0.7	0.44±0.04	18.0±0.7	0.73±0.08	1.31±0.03	–0.42±0.04
	A/B	1.15	1.78	1.06	1.22	0.96	0.43
		***	**	NS	*	NS	***

The uppermost fully expanded leaves were used for measurements. Measurements at the heading were taken when a panicle of a main stem emerged completely. *, **, and *** indicate asignificant difference at the 5, 1, and 0.1 % level, respectively, between two varieties. NS, non-significant.