Journal of Tropical Oceanography >
The seed morphology and internal characteristics of seagrass, surfgrass Phyllospadix iwatensis
Copy editor: LIN Qiang
Received date: 2021-11-23
Revised date: 2022-03-24
Online published: 2022-04-18
Supported by
National Natural Science Foundation of China(42006110)
Technology Innovation Development Program of Yantai(2020MSGY058)
Shandong Provincial Natural Science Foundation, China(ZR2019QD017)
Key R & D Projects in Shandong Province (International Scientific and Technical Cooperation)(2019GHZ026)
Food and Agriculture Organization of the United Nations “Project Management Office of Demonstration of Estuarine Biodiversity Conservation, Restoration and Protected Area Networking in China”(GCP/CPR/045/GFF)
Research on Changdao Ecological Fishery Development and Marine Ranching Restoration Technology(2019MSGY126)
The global seagrass bed ecosystems are facing multiple threats. For instance, the seagrass Phyllospadix (Zosteraceae) is of great ecological importance and fishery value. And one of the seagrasses surfgrass, Phyllospadix, is relatively poorly studied. In particular, there are more study gaps in the description, micro-observation and germination process of the main breeding carrier, seeds of surfgrass, as well as in the identification of DNA molecules. In this study, Phyllospadix iwatensis was used as the study object to describe its growing environment, external characteristics of seeds, internal structure, germination process, etc. in both qualitative and quantitative ways, and the results show that fruits and seeds of surfgrass have the adaptability on external form and internal structure in the marine environment, and have the advantage of becoming tool species for vegetation restoration in coastal zone. External morphological features include unique fruit inflorescence and fruit shape, as well as wing-like structure and medial mane, of which the fruit inflorescence is curved shrimp-shaped with an average length of 3.4 cm and the fruit is horseshoe-shaped with a diameter of 3-4 mm. The internal structural features include a large proportion of endosperm and complex anatomy of the peel and seed coat. This study complements the lack of in-depth study on the seeds of marine submerged plants, such as surfgrass, and provides valuable suggestions and reference contents for the protection of surfgrass and other types of seagrass seed banks, as well as the restoration of seagrass beds, and also yields a basis for the practical application of surfgrass in seedling restoration.
Key words: seagrass; Phyllospadix iwatensis; fruit; seed; morphology
HAN Tong , LI Jingjing , LIU Zhengyi , LIU Kai , Zhang Jinhao , QIN Song , ZHONG Zhihai . The seed morphology and internal characteristics of seagrass, surfgrass Phyllospadix iwatensis[J]. Journal of Tropical Oceanography, 2022 , 41(6) : 105 -113 . DOI: 10.11978/2021163
图3 红纤维虾形草(Phyllospadix iwatensis)果序形态a. 果序背面形态; b. 果序腹面形态; c. 果序未剥开外观; d. 果序剥开外观 Fig. 3 The shape of Phyllospadix iwatensis involucre |
表1 23粒红纤维虾形草果序外观描述数据统计结果Tab. 1 The statistical results of involucre shape |
果序长度/cm | 柄长度/cm | 果序宽度/cm | 果序厚度/cm | 种子数目 | |
---|---|---|---|---|---|
平均值 | 3.4 | 2.8 | 0.6 | 0.4 | 5.6 |
标准差 | 0.5 | 0.6 | 0.1 | 0.1 | 0.7 |
标准误差 | 0.7 | 0.8 | 0.1 | 0.1 | 1.6 |
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