Reproductive development of 41-year-old half-stands of siberian cedar pine (Pinus sibirica Du Tour) from plus trees selected by seed productivity

Abstract

The half-siblings of Siberian cedar pine (Pinus sibirica Du Tour) are grow on the "Ermaki" plantation in the Sayansky district forestry of the Ermakovskoye forestry in Krasnoyarsk region. These are the seed progeny of plus trees certified for seed productivity in 1977 in the Kolyvan forestry district of Novosibirsk region: 89/53, 90/54, 99/63, 103/67, 109/73, and 110/74. The variability of indicators of half-siblings was compared between and within families. The half-siblings were selected for the highest formation of macrostrobili and cones: in family 89/53, halfsiblings No. 10-18 and No. 10-11 (the excess over the average was 120.3 % and 78.0 %), in family 90/54 – No. 10-35 (129.2 %), 99/63 – No. 10-19 (75.1 %), 106/63 – No. 10-32 and No. 10-27 (60.0 % and 50.0 %), 109/73 – No. 10-28 (115.7 %), 110/74 – No. 10-16, No. 10-23 and No. 10-9 (114.2 %, 111.2 % and 80.1 %). The half-siblings with the highest number of microstrobiles were selected: No. 2-6 in family 89/53 (the excess was 126.9%), No. 2-7 in family 90/54 (54.0 %), No. 2-23 in family 99/63 (137.3%), No. 2-30 in family 103/67 (264.3 %), No. 2-24 in family 109/73 (132.8 %), No. 10-23 in family 110/74 (71.8 %). These half-siblings are recommended for propagation to grow planting material with increased seed productivity.