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Minimal Male/Female Tradeoffs in Zizania palustris, a Monoecious Annual Grass

Doris Armstrong Goldman
American Journal of Botany
Vol. 78, No. 2 (Feb., 1991), pp. 189-197
Stable URL: http://www.jstor.org/stable/2445242
Page Count: 9
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Minimal Male/Female Tradeoffs in Zizania palustris, a Monoecious Annual Grass
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Abstract

Because a male/female resource tradeoff is a basic assumption of many models of sex allocation in cosexual plants, statistical and manipulative methods were used to look for evidence of intersexual resource conflicts in Zizania palustris In this monoecious grass, male and female investments overlap in time within each panicle and on successive panicles, and sex allocation quickly responds to environmental changes. Nevertheless, no negative correlations were found between the numbers of florets of each sex within panicles, on consecutive panicles, or on whole plants. Removing immature fruits or florets of either sex did not significantly increase subsequent investment in the other sex. The one significant tradeoff was slightly lower total fruit production on plants with exceptionally large male investment. Wild rice, therefore, fits the tradeoff assumption of sex allocation models at the population level but rarely at the individual level.

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