PLANT SIZE, GEITONOGAMY AND SEED SET IN IPOMOPSIS-AGGREGATA

被引:110
作者
DEJONG, TJ
WASER, NM
PRICE, MV
RING, RM
机构
[1] UNIV CALIF RIVERSIDE,DEPT BIOL,RIVERSIDE,CA 92521
[2] EARLHAM COLL,RICHMOND,IN 47374
[3] ROCKY MT BIOL LABS,CRESTED BUTTE,CO 81224
关键词
POLLEN TRANSFER; SELF-INCOMPATIBILITY; MONOCARPIC PERENNIAL; EVOLUTIONARY ECOLOGY;
D O I
10.1007/BF00317407
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We used powdered fluorescent dyes to estimate receipt of self vs. outcross pollen in the self-incompatible species Ipomopsis aggregata (Polemoniaceae). Flowers on small and large plants received equal amounts of outcross pollen, whereas flowers on large plants received more self pollen, so the proportion of self pollen delivered through geitonogamy increased with plant size. In natural populations emasculation of all flowers on a plant raised average seed set per flower from 5.19 to 6.99 and also raised fruit set, though not significantly. From these results one expects a negative correlation between plant size and seeds per flower. The opposite trend was observed in a sample of plants in the field, suggesting that deleterious effects of geitonogamy on female fecundity in large plants can be overruled by other factors such as size-related fruit or seed abortion. Results are discussed in relation to the evolution of gynodioecy.
引用
收藏
页码:310 / 315
页数:6
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