Table 2.

Effect of mother tree on the frequency of maritime pine megagametophytes that produced established EMs after 4 months in culture.

Mother tree	Year of the experiment
	2012	2015	2017
B5	38.0 ± 3.2 a	40.5 ± 3.9 a	30.2 ± 5.0 a
B12	4.0 ± 3.2 c	NT	15.6 ± 5.0 ab
B14	5.1 ± 3.2 c	17.0 ± 3.9 b	21.7 ± 5.1 ab
B25	17.9 ± 3.3 b	NT	12.5 ± 5.0 ab
B50	26.0 ± 3.2 b	22.1 ± 3.9 b	6.3 ± 5.0 b

Data for each year are means ± standard error of at least 10 replicates with 6–10 explants each. Within each column, values followed by the same letter were not different according to the Mann–Whitney U-test. NT, not tested.