The effect of pollination on resource allocation among sexual reproduction,clonal reproduction,and vegetative growth in <Emphasis Type="Italic">Sagittaria potamogetifolia</Emphasis> (Alismataceae) |
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Authors: | Fan Liu Yi-Ying Liao Wei Li Jin-Ming Chen Qing-Feng Wang Timothy J Motley |
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Institution: | (1) Key Laboratory of Aquatic Botany and Watershed Ecology, The Chinese Academy of Sciences, 430074 Wuhan, Hubei, People’s Republic of China;(2) Wuhan Botanical Garden, The Chinese Academy of Sciences, 430074 Wuhan, Hubei, People’s Republic of China;(3) Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, 430074 Wuhan, Hubei, People’s Republic of China;(4) Department of Biological Sciences, Old Dominion University, Norfolk, VA 23529-0266, USA; |
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Abstract: | In order to evaluate the effects of pollination on resource allocation in the marsh herb Sagittaria potamogetifolia, experimental manipulation of pollination efficiency on the pattern of resource allocation was accessed by the proportion
of dry weight measurements of sexual, vegetative, and clonal organs. In trials where half of the flowers were pollinated,
a significant increase of resource allocated to sexual production and decrease to vegetative production resulted compared
to plants that received no pollination. In trials where pollination was 100%, these two reproductive components showed the
same trend, but less dramatically. This may support the idea that the trade-offs would be more pronounced when the resource
was scarce. Besides, a higher inflorescence production with a lower fruit reproduction occurred as a consequence of decreased
pollination level. This increased inflorescence production may be a mechanism to promote outcrossing by enhancing floral attraction
or by synchronizing reproductive activity with insect pollinators. Examination for possible trade-offs in resource allocation
revealed that there was also a trade-off caused by pollination between fruits plus flowers and bulbils production, which might
have detrimental effects on the survival of individuals and populations, but promotes outcrossing and genetic variability. |
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