Fig. 3.

Relationships between photosynthetic rate and nitrogen content per unit area of leaves (A, B), and stomatal conductance for CO₂ (C, D) of ten rice genotypes measured at four different developmental stages from field experiments in 2001 (A, C) and 2002 (B, D). The number on the lines show the developmental stage: 1, panicle initiation to 2 weeks before heading (2 WBH); 2, 2 WBH to heading; 3, heading to 2 weeks after heading (2 WAH); 4, 2 WAH to maturity. Symbols are the same as in Fig. 2. *denotes significance at the 5% level, and **at the 1% level.