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. 2019 Feb 19;10:138. doi: 10.3389/fpls.2019.00138

Table 1.

Effect of pollination type on the production of maritime pine cones and seeds.

Mother tree Mean cone length (cm)
Mean number of seeds/cone
Open pollinated (Number of years) Controlled crosses (Number of fathers) Open pollinated (Number of years) Controlled crosses (Number of fathers)
B5 15.2 ± 2.5 (3) b 12.1 ± 2.3 (3) bc 141 ± 11 (3) a 31 ± 18 (4) a
B12 19.0 ± 1.7 (2) a 15.1 ± 1.3 (3) a 115 ± 46 (2) ab 15 ± 17 (5) b
B14 13.2 ± 1.1 (3) c 12.5 ± 1.5 (3) b 87 ± 4 (3) bc 24 ± 15 (3) a
B25 11.8 ± 1.5 (2) d 10.2 ± 1.4 (2) d 103 ± 54 (2) ab 13 ± 13 (2) b
B50 12.0 ± 1.5 (3) d 10.6 ± 1.2 (5) cd 61 ± 31 (3) c 19 ± 18 (5) b
Mean 13.1 ± 2.5 12.0 ± 2.2 (5) 93 ± 43 19 ± 17 (7)

Mean length and mean seed content of female cones harvested in five maritime pine mother trees after open (sampled in 2012, 2015, and 2017) and controlled pollination (sampled in 2012 and 2017). Data, are means ± standard error of at least three cones. Within each column, values followed by the same letter did not differ according to the Mann–Whitney U-test.