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Effect of Air Exposure on the Germination Rate of Surfgrasses, Phyllospadix japonicus and P. iwatensis Seeds

말잘피, 게바다말과 새우말 종자의 공기 노출에 따른 발아율

Jung-Im Park1*
,
Jong Il Bai1
,
Sung Il Hwang1
박 정임1*
,
배 종일1
,
황 성일1
1Underwater Ecology Institute, Yeosu 59769, Korea
1㈜수중생태기술연구소
*Corresponding Author
31 December 2023. pp. 103-112
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Abstract

Surfgrasses, Phyllospadix japonicus and P. iwatensis are marine macrophytes that grow on rocky substrates in areas with high wave energy, designated as marine protected species in Korea. Since the seed production of surfgrasses is abundant, utilizing the seeds could be an effective method for restoring surfgrass habitats. During the process of collecting and handling surfgrass seeds for habitat restoration, surfgrass seeds unavoidably come into contact with air. To assess the tolerance of surfgrass seeds to air exposure, we examined changes in germination rates and moisture content of these two surfgrass species after exposure to air. The average germination rates of P. japonicus and P. iwatensis seeds not exposed to air were 86.7±3.8% and 80.0±5.0%, respectively, with no significant difference observed. However, after 10 hours of air exposure, the germination rate of P. iwatensis seeds was significantly higher than that of P. japonicus. In contrast, the moisture content of the two surfgrass seeds did not show a significant difference depend on exposure time. This suggests that P. iwatensis seeds, which are relatively larger in size and have a thicker seed coat, exhibit greater resistance to drying due to air exposure compared to P. japonicus seeds, which are smaller in size and have a thinner seed coat. These results provide valuable information for habitat restoration using the seeds of marine protected species, P. japonicus and P. iwatensis.

Keywords
air exposure
germination rate
Phyllospadix iwatensis
Phyllospadix japonicus
seed

말잘피, 게바다말과 새우말은 파동에너지가 높은 해역의 조하대 암반에 생육하는 해양현화식물로서 해양보호생물로 지정되어 있다. 말잘피는 종자 생산량이 많으므로, 종자를 활용한다면 효율적인 말잘피 서식지 복원방법이 될 것이다. 그러나, 서식지 복원을 위해 말잘피 종자를 수확하고 다루는 과정 중에는 필연적으로 말잘피 종자가 공기 중에 노출되게 된다. 침수식물인 잘피 성체가 공기에 노출되면 건조 스트레스를 겪게 되는 것처럼 잘피 종자도 건조 스트레스를 받게 될 것이다. 이번 연구에서는 게바다말과 새우말 종자의 공기 노출 한계를 알아보기 위해 두 종 말잘피 종자를 공기에 노출시킨 후 종자의 발아율과 수분함량의 변화를 알아보았다. 노출시간에 따른 두 종 말잘피 종자의 발아율은 노출 6시간까지 유지되었으나, 8시간 후 급격히 감소한데 비해 수분함량은 노출 후 지속적으로 감소하였다. 공기에 노출되지 않은 게바다말과 새우말 종자의 평균 발아율은 각각 86.7±3.8%와 80.0±5.0%로 유의한 차이가 나타나지 않았지만, 10시간 노출된 종자의 발아율은 새우말이 게바다말보다 유의하게 높았다. 그에 비해 노출시간에 따른 두 종 말잘피 종자의 수분함량은 종간에 유의한 차이가 나타나지 않았다. 이는 비교적 종자의 크기가 크고 두꺼운 종피를 보유한 새우말 종자가 종자의 크기가 작고, 얇은 종피를 보유한 게바다말 종자보다 공기 노출로 인한 건조 내성이 좀 더 강한 것을 의미한다. 이 결과는 해양보호생물인 말잘피, 게바다말과 새우말 종자 기반의 서식지 복원에 유용한 정보를 제공할 것이다.

키워드
게바다말
공기 노출
발아율
새우말
종자
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Information
  • Publisher :The Korean Society of Phycology
  • Publisher(Ko) :한국조류학회
  • Journal Title :Aquatic Nature
  • Journal Title(Ko) :수생생물
  • Volume : 3
  • No :2
  • Pages :103-112
  • Received Date : 2023-11-22
  • Revised Date : 2023-12-15
  • Accepted Date : 2023-12-18
  • DOI :https://doi.org/10.23135/an.2023.3.2.4
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