Effects of Light and Autotoxicity on the Reproduction of Bidens pilosa L.: From Laboratory to the Field

Ming-Tung Hsueh, Chihhao Fan, Hsiao-Feng Lo and Wen-Lian Chang
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Ming-Tung Hsueh: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan
Chihhao Fan: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan
Hsiao-Feng Lo: Department of Horticulture and Landscape Architecture, National Taiwan University, Taipei 106, Taiwan
Wen-Lian Chang: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan

Agriculture, 2020, vol. 10, issue 11, 1-19

Abstract: In Taiwan, the good agricultural practices for Bidens pilosa L. (Cobbler’s pegs) had been established due to its pharmacology application. However, the reproduction of this species that may cause phytotoxicity to the subsequent crops has not been investigated extensively. We hypothesized that both the phytotoxicity and canopy shading conditions that were altered by agricultural practices might affect its seed reproduction. Three experiments from laboratory, pot and field were conducted under different light treatments and residue application rates to evaluate the light requirement and phytotoxicity on the germination of Cobbler’s pegs. The results showed that the germination in the laboratory, dark treatments was higher than that of light treatment while it was inhibited in the darkness in the pot experiments (24% of the light treatments). Moreover, some seeds in the pot experiments germinated in the far-red light (FR) pretreated dark treatments. This observation indicated that the germination response of the investigated plant might be a very low fluence response (VLFR). Results also showed that the autotoxicity enhanced the germination reduction in the FR pretreated dark treatment while increasing the residues buried in the field. Accordingly, both autotoxicity and canopy shading may inhibit the reproduction of Cobbler’s pegs, but the application method needs further study.

Keywords: autotoxicity; far-red light pretreatment; phytotoxicity; plant extracts; very low fluence response (VLFR) (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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