【摘 要】
：
As a main invasive plant in China, Bidens pilosa exhibits allelopathic effects on spermatophyte growth, threatening fern growth in the field.It is hypothesized that allelopathy plays an important role
【机 构】
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College of Forest Resources and Environment, Nanjing Forestry University, Nanjing, Jiangsu, 210037,
【出 处】
：
第五届长江三角洲地区植物学学术研讨会
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As a main invasive plant in China, Bidens pilosa exhibits allelopathic effects on spermatophyte growth, threatening fern growth in the field.It is hypothesized that allelopathy plays an important role in plant invasion.Hence, we examined the allelopathy of invasive plant to fern gametophyte and elucidated the mechanisms by which invasive plant causes phytotoxicity.Pteris multifida is a common fem in China, with overlapping distribution area with B.pilosa.Root exudates ofB.pilosa were applied to investigate their effects on fluorescence and pigments in P.multifida gametophytes.We found that gametophytes exposed to B.pilosa had decreased fluorescence parameters in comparison with the control, except for non-photochemical quenching (NPQ).Furthermore, it was found that these parameters were markedly affected from day 2 to day 10 in the presence of exudates at a concentration of 25% or above.B.pilosa exudate had a negative dose-dependent effect on Chlorophyll a, Chlorophyll b, carotenoid (Car) and the total chlorophyll in the gametophyte.The inhibitory effects increased with increasing exudate concentrations of species, exhibiting the greatest inhibition at day 10.It is concluded that B.pilosa negatively affected the photosynthesis of P.multifida via allelopathic interference.Allelopathic experiments demonstrated that invasive plants were responsible for the critical damage to local species.
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