Dimorphic Stigmas, Pollen Accumulation, and Seed Production in the Gynodioecious Plant Arenaria merckioides var. chokaiensis (Caryophyllaceae).
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Accession number;99A0864491
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| Title;Dimorphic Stigmas, Pollen Accumulation, and Seed Production in the Gynodioecious Plant Arenaria merckioides var. chokaiensis (Caryophyllaceae). |
| Author;
SUGAWARA T
(Shinshu Univ., Nagano, Jpn)
HORII Y
(Yokote Technical High School, Akita, Jpn)
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Journal Title;Shokubutsu Bunrui, Chiri
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Journal Code:L2614A
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ISSN:0001-6799
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VOL.50;NO.1;PAGE.13-20(1999)
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| Figure&Table&Reference;FIG.2, TBL.4, REF.17 |
| Pub. Country;Japan |
| Language;English |
| Abstract;In the gynodioecious plant Arenaria merckioides var. chokaiensis, stigma length is significantly longer in female flowers than in hermaphrodite flowers. To elucidate the functional significance of dimorphic stigmas we determined the number of pollen grains actually deposited on the stigmas and fruit and seed set percentages of hermaphrodite and female plants in a natural population. The number of pollen grains on the stigma was much less in female flowers than in hermaphrodite flowers, so the longer stigmas of the female plants are unlikely to increase the ability to trap pollen grains over the hermaphrodite plants in field. Fruit set percentage and average number of seeds per flower in the female plants were usually larger than those in the hermaphrodite plants. Lower seed set in the hermaphrodite plants is in contrast to the greater amount of pollen deposited on their stigmas. The reason may be due to selfing, because fruit and seed set percentages of the self-pollinated hermaphrodite flowers are usually less than in cross-pollinated flowers. (author abst.) |
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