Fig. 8.

The effects of CO₂, P and water regime on relative water content of leaf (RWC) (A), and concentrations of total soluble sugars (B) and inorganic P (Pi) (C) in leaves of field pea at the flowering stage. Plants were exposed to ambient (aCO₂) or elevated CO₂ (eCO₂) treatments for 123 d in a P-deficient vertisol supplied with 15 (P15) or 60 mg P kg⁻¹ (P60) soil, and drought-stressed plants had water withheld to generate 63–70 % of field water capacity (FWC) (initial-phase drought at Day 107), 52–57 % of FWC (mid-phase drought at Day 114) and 43–46 % of FWC (final-phase drought at Day 122) during the last 3 weeks of the experiment. Columns are means of four replicates ± s.e. The vertical bars indicate the LSD (P = 0.05).