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Germination and Storage Behavior of Seeds of Scaevola taccada (Gaertner) Roxb.

  • Date of declaration:2018-03-27
Jeng-Chuann Yang, Shing-Rong Kuo
Year
2018
Key Words
Scaevola taccada (Gaertner) Roxb., germination, orthodox, seed storage behavior, stratification.
Abstract

The purpose of this study was to examine the germination characteristics of seeds of Scaevola taccada. Effects of the seed moisture content (MC) and storage temperature on germination were investigated to determine its seed storage behavior. Results showed that seeds of S. taccada were non-dormant. The majority of fresh mature seeds germinated during 2~5 wk under fluctuating temperatures of 30/20℃ with 8 h of light, and few seeds irregularly germinated in the subsequent 5~20 wk. It was speculated that the difference in germination speed was related to the degree of seed maturity. Moreover, stratification at 4℃ neither improved germination nor decreased the mean germination times (MGTs) of seeds of S. taccada. In other words, stratification at 4℃ is not practical for nursery operations because it cannot promote more-uniform germination. Besides, the seeds faced a great risk of dying during moist storage at 4℃ for more than 3 mo; thus, moist storage at 4℃ should not be applied to short-term storage of seeds of S. taccada. However, seeds of S. taccada dried to 1.9~5.9% MCs (on a fresh-weight basis) still maintained viability after 2 yr of storage at -20, 4, and 15℃. Seeds of S. taccada can tolerate desiccation and sub-zero temperatures, which qualifies them as orthodox. In short, seeds of S. taccada can be stored over a long-term period to assure future seed supplies. If seed storage of S. taccada is used for plant germplasm collection and long-term conservation, we recommend that seeds of S. taccada should be dehydrated to 3~7% MCs and then hermetically sealed before storage at -20℃.