Table 3.

In vitro germination of quartets from wild-type and mutants plants

Genotype	No. of pollen grains germinated normally in a quartet
	0 (%)	1 (%)	2 (%)	3 (%)	4 (%)
qrt1/qrt1	8.1±1.8	30.6±9.3	34.9±1.2	20.2±8.1	6.2±2.4
csld1-1/+; qrt1/qrt1	15.0±4.5	54.8±6.2	30.2±3.0	0.0	0.0
csld4-3/+; qrt1/qrt1	13.0±2.6	43.0±4.1	44.0±5.2	0.0	0.0
csld1-1/+; csld4-3/+; qrt1/qrt1	46.1±9.1	45.5±8.0	8.4±1.1	0.0	0.0

Quartets were cultured in vitro at 22 °C for 6 h. All results represent the average of three biological replicates with the standard deviation. For each independent replicate, at least 200 quartets were analysed.