Devastating impact of the seed-feeding fly Japanagromyza tokunagai on the endangered orchid Cephalanthera falcata.

IF 2.7 3区 生物学 Q2 PLANT SCIENCES
Kenji Suetsugu, Rikiya Kurashige, Shigeki Fukushima
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引用次数: 0

Abstract

Numerous studies have examined the reproductive systems of threatened orchids to develop effective conservation strategies. However, the detrimental effects of seed predators on seed production are often overlooked. In this study, we evaluated the impact of the seed-parasitic fly Japanagromyza tokunagai on the seed production of the endangered orchid Cephalanthera falcata, based on observations from five locations over one year and from a single location over four years in Chiba Prefecture, Japan. Our findings showed that J. tokunagai caused 100% capsule damage across all sites and years examined. Although some infested fruits still produced seeds in certain locations and years, the quantities were very low. Consequently, we observed a 99.1-100% reduction in seed production across all populations investigated. These results suggest that reduced seed production could limit generational turnover, potentially threatening the reproductive success and long-term survival of C. falcata, at least in the populations studied. This highlights the need to mitigate the negative impact of J. tokunagai on seed production in C. falcata. Combining artificial pollination with the bagging of individual inflorescences could be an effective approach, capable of increasing seed production by more than 100-fold. Given the fungal dependence and low germination rates of C. falcata, future work should also examine seedling recruitment to better understand the impacts of seed loss and improve estimates of long-term resilience.

食籽蝇对濒危兰花falcata的破坏性影响。
许多研究已经检查了受威胁兰花的生殖系统,以制定有效的保护策略。然而,种子捕食者对种子生产的不利影响往往被忽视。本研究通过对日本千叶县5个地点1年的观测和4年的单个地点的观测,评价了种子寄生蝇日本农蝇(Japanagromyza tokunagai)对濒危植物falcata头兰(Cephalanthera falcata)种子产量的影响。我们的研究结果表明,tokunagai在所有部位和年份都造成了100%的胶囊损伤。虽然一些受侵染的水果在某些地点和年份仍会产生种子,但数量非常少。因此,我们观察到所有被调查群体的种子产量减少了99.1-100%。这些结果表明,至少在研究的种群中,种子产量的减少可能会限制代际更替,潜在地威胁到falcata的繁殖成功和长期生存。因此,有必要减轻日本蓟马对falcata种子生产的负面影响。将人工授粉与单个花序套袋相结合可能是一种有效的方法,能够将种子产量提高100倍以上。考虑到镰状芽孢霉对真菌的依赖性和低发芽率,未来的工作还应该研究幼苗招募,以更好地了解种子损失的影响,并提高对长期恢复力的估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Plant Research
Journal of Plant Research 生物-植物科学
CiteScore
5.40
自引率
3.60%
发文量
59
审稿时长
1 months
期刊介绍: The Journal of Plant Research is an international publication that gathers and disseminates fundamental knowledge in all areas of plant sciences. Coverage extends to every corner of the field, including such topics as evolutionary biology, phylogeography, phylogeny, taxonomy, genetics, ecology, morphology, physiology, developmental biology, cell biology, molecular biology, biochemistry, biophysics, bioinformatics, and systems biology. The journal presents full-length research articles that describe original and fundamental findings of significance that contribute to understanding of plants, as well as shorter communications reporting significant new findings, technical notes on new methodology, and invited review articles.
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