Effects of near-infrared sorting and fungicide treatment on the germination rate of Cryptomeria japonica and Chamaecyparis obtusa seeds

Masashi Hara, Osamu Matsuda, Yukihito Ochiai, Hiroyuki Tobita, Hajime Utsugi

Research output: Contribution to journalArticle

Abstract

We evaluated the effects of pre-sowing treatments such as near-infrared (NIR) light sorting (for filled seeds) and fungicide cleansing on the germination rate of Cryptomeria japonica and Chamaecyparis obtusa seeds, which were stored dry for 18 months below freezing. After NIR light sorting, seed germination rates of both species were greatly increased; as for C. japonica, more than 90 % of all collected seeds successfully germinated, the rate considered as the minimum requirements for containerized seedling production via single-seed sowing procedures. On the other hand, seeds of both species soaked in fungicide solution or water before sowing exhibited a tendency to germinate earlier than unsoaked controls. However, these cleansing treatments did not perfectly prevent seed deterioration due to mold breeding or putrefaction, and hence the effect was not significant at later than two weeks after sowing. It is expected that future development of methods for identifying stale seeds and/or for preventing sown seeds from deterioration will further contribute to improve production efficiency of afforestation tree seedlings.

Original languageEnglish
Pages (from-to)247-251
Number of pages5
JournalNihon Ringakkai Shi/Journal of the Japanese Forestry Society
Volume98
Issue number5
Publication statusPublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Forestry

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