Effects of pollination intensity on the vigor of the sporophytic and gametophytic generation of Cucurbita texana |
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Authors: | Magnús H Jóhannsson A G Stephenson |
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Institution: | (1) Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA Tel. 814-863-1553; Fax 814-865-9131 e-mail as4@psu.edu, US |
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Abstract: | We examined the effects of pollen competition (pollen load size) on sporophytic vigor and gametophytic performance in Cucurbita texana, a wild gourd, while controlling for alternative interpretations of the data. Under field conditions we compared the vigor
of progeny produced from large and small pollen loads and examined the in vitro performance of the pollen produced by the
progeny. We found that the progeny from large pollen loads germinated faster and had a greater reproductive output (male flowers
and fruits) than progeny produced from small pollen loads. In addition, we found that the pollen produced on plants derived
from large pollen loads grew faster in vitro than the pollen produced on plants derived from small pollen loads. These findings
indicate that pollen competition affects the performance of the resulting sporophytic generation and the microgametophytes
they produce.
Received: 26 January 1997 / Revision accepted: 25 June 1997 |
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Keywords: | Cucurbita texana Pollen Pollen performance Pollen competition |
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