REPRODUCTIVE ALLOCATION IN HERMAPHRODITE AND FEMALE PLANTS OF SIDALCEA OREGANA SSP SPICATA (MALVACEAE) USING 4 CURRENCIES

被引:118
作者
ASHMAN, TL [1 ]
机构
[1] UNIV CALIF DAVIS, DEPT BOT, DAVIS, CA 95616 USA
关键词
D O I
10.2307/2445492
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Reproductive allocation was investigated in female and hermaphrodite plants of gynodioecious Sidalcea oregana ssp. spicata. Total reproductive investment and partitioning of that investment was documented at the level of whole plants in terms of four ecologically relevant currencies: biomass, nitrogen, phosphorus, and potassium. Nutrient augmentations in the field confirmed that nutrients were limiting plant vegetative growth and propensity to flower; thus the use of these nutrients as currency was appropriate. Once the effects of plant size were removed, the sex morphs allocated similar total amounts of biomass, nitrogen, phosphorus, and potassium to reproduction, but partitioned those differentially. For any given individual size, females allocated larger proportions of their reproductive resource budgets to seeds. Hermaphrodites' reproductive investment in pollen and flowers was allocated at the expense of allocation to seeds. These data are relevant to the evolution of gynodioecy from hermaphroditism and support the hypothesis that females reallocate resources not spent on pollen to seeds.
引用
收藏
页码:433 / 438
页数:6
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