Departmental Bulletin Paper 琵琶湖内湖における湿生植物ヨシ(Phragmites australis( Poaceae))の種子繁殖特性
Characteristics of seed propagation in marsh plant, Phragmites australis (Poaceae) in the attached lagoons (naiko) of Lake Biwa

金子, 有子

The seed set and germinating rates of Phragmites australis (Cav.) Trin. ex Steudel(Poaceae) were investigated in the attached lagoons (naiko) of Lake Biwa. For the fourpopulations with relatively high self-compatibility, mean seed set rates under naturalconditions, self-pollination, and cross-pollination were 3.13%, 17.2%, 3.00%, respectively.For the four populations with lower self-compatibility, mean seed set rates undernatural conditions, self-pollination, and cross-pollination were 3.57%, 0.20%, 7.90%,respectively. Based on these results of pollination experiments, P. australis was shownto be at least partially self-compatible and pollen limitation was shown to be theimportant factor in decreasing seed production under natural conditions. For all of thestudied populations, mean germinating rates was 32.5%. Some seeds after self-pollinationgerminated and survived normally for at least 30 days.

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