POLLEN-OVULE RATIO, POLLEN SIZE, AND THE RATIO OF STIGMATIC AREA TO THE POLLEN-BEARING AREA OF THE POLLINATOR: AN HYPOTHESIS
نویسندگان
چکیده
منابع مشابه
The relationship between the pollen–ovule ratio and pollen size: another comparative test of a sex allocation hypothesis
Hypothesis: Sex allocation theory predicts that the pollen–ovule ratio should decrease linearly with increasing pollen size among seed plants (Charnov, 1982). Data examined: We retrieved data for pollen–ovule ratio, pollen size, pollen grain number, and mating system from published literature for 311 angiosperm plant species. Methods: We used model II regressions on cross-species data as well a...
متن کاملThe relationship between the pollen–ovule ratio and seed size: a comparative test of a sex allocation hypothesis
Hypothesis: Sex allocation theory predicts that the pollen–ovule ratio should increase linearly with increasing seed size among seed plants (Charnov, 1982). Data examined: We retrieved data for the pollen–ovule ratio, seed size, and possible confounding variables (ovule number, plant height, mating system) from a database and additional literature for 299 gymnosperm plant species of the German ...
متن کاملPollen histochemistry and pollen : ovule ratios in Zingiberaceae.
BACKGROUND AND AIMS Pollen grains of 37 species from 11 genera in the family Zingiberaceae were examined to assess qualitatively starch or lipid contents; the pollen grain and ovule numbers per flower and pollen : ovule ratios were also counted and calculated. Pollen : ovule ratios were studied to reveal patterns of variation in the Zingiberaceae. METHODS Freshly open flowers with dehiscing a...
متن کاملChapter 2 The relationship between seed size and the pollen - ovule ratio – a comparative test of sex allocation theory
Hypothesis: Sex allocation theory predicts that the pollen-ovule ratio should increase linearly with increasing seed size among seed plants (Charnov 1982). Data examined: We retrieved data for pollen-ovule ratio, seed size and possible confounding variables (ovule number, plant height, mating system) from a database and additional literature for 299 angyosperm plant species of the German flora....
متن کاملHeterospecific pollen deposition in Delphinium barbeyi: linking stigmatic pollen loads to reproductive output in the field.
BACKGROUND AND AIMS Most pollinators are generalists and therefore are likely to transfer heterospecific pollen among co-flowering plants. Most work on the impacts of heterospecific pollen deposition on plant fecundity has utilized hand-pollination experiments in greenhouse settings, and we continue to know very little about the reproductive effects of heterospecific pollen in field settings. ...
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ژورنال
عنوان ژورنال: Evolution
سال: 1981
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1981.tb04962.x