Table 1.

Effect of high temperature and CO₂ enrichment on pollen germination and on the fraction of elongated pollen tubes

	Pollen germination
Treatment (temp. °C)	% of total	% of control	Elongated pollen tubes (% of total)
26/22	37 ± 3	100	15 ± 2
32/26	12 ± 2	32	0
26/22	31 ± 3	100	17 ± 3
26/22+ CO2	48 ± 5	154	29 ± 3

Control treatment is considered as 26/22 °C (day/night) at normal CO₂ concentration. Data are means (n = 8) ± s.e.