[논문]Variation of Seed Viability among Cone Harvest Times at Two Clonal Seed Orchards of Chamaecyparis obtusa

Da-Eun, Gu; Ji-Hee, Jeong; Ye-Ji, Kim; Kyu-Suk, Kang

doi:10.7747/jfes.2022.38.4.256

Variation of Seed Viability among Cone Harvest Times at Two Clonal Seed Orchards of Chamaecyparis obtusa 원문보기

Journal of forest and environmental science, v.38 no.4, 2022년, pp.256 - 262

Da-Eun, Gu (Department of Seed and Seedling Management, National Forest Seed and Variety Center, Korea Forest Service) , Ji-Hee, Jeong (Department of Seed and Seedling Management, National Forest Seed and Variety Center, Korea Forest Service) , Ye-Ji, Kim (Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University) , Kyu-Suk, Kang (Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University)

Abstract ▼ AI-Helper

The timing of seed harvesting is an important decision in the management of seed orchards because it affects seed quality and yield. To investigate the effect of cone harvest time on seed quality and determine the optimal harvesting time, cones were regularly collected in seven times and germination tests were performed at each harvest time in two clonal seed orchards of Chamaecyparis obtusa. As cones developed, the percentage of seed germination increased before cone moisture content began to decrease significantly. The moisture contents of cones were highest at the first collection as 68.3% and 67.3% in Jeju and Gochang seed orchards respectively. At this time, germination speed was slowest, indicating poor seed vigour. The highest germination was found at the second stage in Jeju (36.5%) and at the seventh stage in Gochang (28.6%) seed orchard. The germination speed increased as cone moisture content decreased. Additionally, changes of seed vigour differed among the developmental stages in both seed orchards. Consequently, the optimal cone harvest time of C. obtusa seed orchards in Jeju was early September when high germination percentage was obtained. In Gochang seed orchards, late October was optimal cone harvest time when the germination speed was fast and the cone moisture content decreased.

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표/그림 (4)

그림 Fig. 1. Moisture content of cone according to harvest time in Jeju (a) and Gochang (b) seed orchards of C. obtusa. Dotted lines represent the mean values of the individual tree, and each boxplot represents a summary of harvest time. Different letters above the boxplots represent significant differences among harvest times according to Tukey's HSD tests at α=0.05.
그림 Fig. 2. Germination percentage according to cone harvest time in clonal seed orchards of C. obtusa; (a) Jeju and (b) Gochang. Different letters above the boxplots represent significant differences among harvest times according to pairwise post-hoc tests at α=0.05.
그림 Fig. 3. Average of T₅₀ among clones according to cone harvest time in clonal seed orchards of C. obtusa; (a) Jeju and (b) Gochang. Different letters above the boxplots represent significant differences among harvest times according to pairwise Tukey's HSD tests at α=0.05.
표 Table 1. Spearman's rank correlation coefficient among cone moisture content, germination percentage and T₅₀ in clonal seed orchards of C. obtusa at Jeju (above diagonal) and Goching (below diagonal)

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Variation of Seed Viability among Cone Harvest Times at Two Clonal Seed Orchards of Chamaecyparis obtusa 원문보기

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Variation of Seed Viability among Cone Harvest Times at Two Clonal Seed Orchards of Chamaecyparis obtusa 원문보기

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