Fig. 6From: Interactive effects of elevated CO2 concentration and combined heat and drought stress on tomato photosynthesis(a) Chlorophyll a, (b) chlorophyll b, (c) carotenoid and (d) chlorophyll a/b in the first fully expanded leaves of tomato ‘OB’ and ‘LA2093’ from the top. Treatments and sampling are as in Fig. 5. The data represent average values ± SD (n = 3). Different small letters showed significant differences (P < 0.05)Back to article page