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Seasonal Change in the Germination of Heteromorphic Achenes of Bidenspilosa

Date: February 6,2021 |Hits: 4606 Download PDF How to cite this paper

Hidehiro Inagaki*, Takehiro Kinoshita

Shizuoka university, Fujieda, Japan.

*Corresponding author: Hidehiro Inagaki


Bidens pilosa is a noxious weed species. Its capitulum is heteromorphic achenes divided into central and peripheral achenes. Central achenes are longer, with thorns facing outward from the capitulum, whereas peripheral achenes are shorter, with thorns facing inward. In the present study, we hypothesized that dimorphic achenes of B. pilosa have different seed dispersal strategies, and we compared the difficulty of their detachment and seasonal changes in their germination in order to identify the differences in these strategies. Our results revealed that central achenes were significantly easier to detach than peripheral achenes, suggesting that central achenes may be used for dispersal to farther areas, and peripheral achenes may be used for dispersal to neighboring areas. Furthermore, central achenes showed relatively higher germination rates than peripheral achenes. Only the central achenes showed high germination in dark conditions at 20°C in May. In contrast, peripheral achenes showed high germination in dark conditions at 20°C and 25°C in July. This suggested that central achenes germinated first (in May), and peripheral achenes germinated later in the summer. Our results also indicated that the achenes of B. pilosa showed seasonal changes in photoblastic germination, i.e., both central and peripheral achenes showed light-induced germination in March and dark-induced germination from May to September. Dimorphic achenes and seasonal change in dormancy and photoblastic germination cause asynchronous emergence of plants, making it difficult to control the spreading of B. pilosa.


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How to cite this paper

Seasonal Change in the Germination of Heteromorphic Achenes of Bidenspilosa

How to cite this paper: Hidehiro Inagaki, Takehiro Kinoshita. (2021) Seasonal Change in the Germination of Heteromorphic Achenes of BidenspilosaInternational Journal of the Science of Food and Agriculture5(1), 91-96.

DOI: http://dx.doi.org/10.26855/ijfsa.2021.03.013

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