Chin J Plan Ecolo ›› 2012, Vol. 36 ›› Issue (1): 63-71.doi: 10.3724/SP.J.1258.2012.00063

• Research Articles • Previous Articles     Next Articles

Floral sex allocation and flowering pattern in the andromonocious Soranthus meyeri (Apiaceae)

ZHANG Zhen-Chun and TAN Dun-Yan*   

  1. Xinjiang Key Laboratory of Grassland Resources and Ecology & Ministry of Education Key Laboratory for Western Arid Region Grassland Resources and
    Ecology, College of Grassland and Environment Sciences, Xinjiang Agricultural University, Ürümqi 830052, China
  • Received:2011-03-04 Revised:2011-11-30 Online:2012-01-05 Published:2012-01-01
  • Contact: TAN Dun-Yan E-mail:tandunyan@163.com

Abstract:

Aims Andromonoecy, the presence of both staminate and hermaphrodite flowers on the same individual, was observed in Soranthus meyeri, a common early spring ephemeral perennial in the Guerbantonggut Desert of Northwest China. The relationships between sex ratio (number of hermaphrodite flowers/total number of flowers) and plant size and the flowering pattern of both staminate and hermaphroditic flowers of this species were studied to determine size-dependent sex allocation and flowering pattern.
Methods The study was conducted from May to June in 2006–2008. Morphology, number and dry mass of both staminate and hermaphroditic flowers were determined. Position of the two types of flowers and their flowering pattern at the level of the flower, umbel and individual were recorded. Individual biomass was determined, and the relationship between number of staminate and of hermaphroditic flowers and plant size was analyzed.
Important findings The sex ratio within a population of S. meyeri was 0.69 ± 0.03, 0.62 ± 0.03 and 0.69 ± 0.02 in 2006, 2007 and 2008, respectively, and there were no significant differences among the years. This indicates that the sex ratio of this species is stable and possibly controlled by genetics. Staminate flowers produced less pollen, and their biomass was smaller than that of hermaphrodite flowers, suggesting that staminate flowers were less expensive to produce. Primary umbels produced more hermaphrodite flowers than secondary umbels, indicating that the primary umbels are capable of obtaining more resources from the mother plant and increase female fitness. Resources saved by not producing hermaphroditic flowers in secondary umbels could be reallocated to produce more staminate flowers, thus increasing floral display to attract more pollinators as well as enhancing pollen export and overall fitness. The sex ratio per plant was significantly, positively correlated with aboveground vegetative organ biomass, and large plants allocated more to the female function than small plants. Thus, female reproductive success is limited by availability of resources. Flowers in the primary umbel bloom first, followed by those in the secondary umbel five days later. All umbels of the same order flower simultaneously, and all flowers within an umbel open centripetally. Separation of male and female phases through protandry is complete both within hermaphrodite flowers and within umbels, thus avoiding interference between the male and female function and promoting xenogamy. However, there is an overlap of about one day between umbels of consecutive orders, which can provide conditions for geitonogamy.

Alonso C (2005). Pollination success across an elevation and sex ratio gradient in gynodioecious Daphne laureola. American Journal of Botany, 92(8), 1264-1269.
Bateman AJ (1948). Intra-sexual selection in Drosophila. Heredity, 2, 349-368.
Bell CR (1971). Breeding Systems and Floral Biology of the Umbelliferae or Evidence for Specialization in Unspecialization Flowers. In: Heywood VH ed. The Biology and Chemistry of the Umbelliferae. Academic Press, New York, 93-107.
Bertin RI (1982). The evolution and maintenance of andromonoecy. Evolutionary Theory, 6, 25-32.
Bertin RI, Kerwin MA (1998). Floral sex ratios and gynomonoecy in Aster (Asteraceae). American Journal of Botany, 85, 235-244.
Bertin RI, Gwisc GM (2002) Floral sex ratios and gynomonoecy in Solidago (Asteraceae). Biological Journal of the Linnean Society, 77, 413-422.
Charnov EL, Maynard Smith J, Bull JJ (1976). Why are most plants hermaphrodite? Nature, 263, 125-126.
Charnov EL, Los-den Hartogh RL, Jones WT, Assem J(1981). Sex ratio evolution in a variable environment. Nature, 289, 27-33.
Charnov EL (1982). The Theory of Sex Allocation. Princeton University Press, Princeton.
Cruden RW (1976). Intraspecific variation in pollen-ovule ratios and nectar secretion-preliminary evidence of ecotypic variation. Annals of Missouri Botanical Garden, 63, 277-289.
Dafni A, Kevan PG, Husband BC (2005). Practical Pollination Biology. Enviroquest Ltd, Cambridge.
Davila YC, Wardle GM (2002). Reproductive ecology of the Australian herb Trachymene incisa subsp. incisa (Apiaceae). Australian Journal of Botany, 50, 619-626.
Davila YC, Wardle GM (2007). Bee boys and fly girls: Do pollinators prefer male or female umbels in protandrous parsnip, Trachymene incisa (Apiaceae)? Australian Ecology, 32 (7), 798–807.
Decker KL, Pilson D (2000). Biased sex ratios in the dioecious annual Croton texensis (Euphorbiaceae) aue not due to environmental sex determination. American Journal of Botany, 87(2), 221-229.
Decker KL, Caruso CM, Case AL (2007). Sex ratio variation in gynodioecious Lobelia siphilitica: effects of population size and geographic location. Journal of Evolutionary Biology, 20(4), 1396-1405.
Diggle PK (1993). Developmental plasticity, genetic variation,and the evolution of andromonoecy in Solanum hirtum (Solanaceae). American Journal of Botany, 80, 967-973.
Elle E (1999). Sex allocation and reproductive success in the andromonoecious perennial, Solanum carolinense (Solanaceae). I. Female success. American Journal of Botany, 86, 278-286.
Emms SK. (1993). Andromonoecy in Zigadenus paniculatus (Liliaceae): spatial and temporal patterns of sex allocation. American Journal of Botany, 80, 914-923.
Fisher RA (1930). The Genetical Theory of Natural Selection. Oxford University Press, Oxford, U.K..
Gong YB (龚燕兵), Huang SQ (黄双全) (2007). On methodology of foraging behavior of pollinating insects. Biodiversity Science (生物多样性), 15, 576-583. (in Chinese with English abstract)
Harder LD, Barrett SCH (1996). Pollen dispersal and mating patterns in animal-pollinated plants. In: Lloyd DG, Barrett SCH ed. Floral Biology: Studies on Floral Evolution in Animal-Pollinated Plants. Chapman and Hall, New York, 140-190.
Irwin RE (2000). Morphological variation and female reproductive success in tow sympatric Trillium species: evience for phenotypic selection in Trillium erectum and Trillium grandiflorum (Liliaceae). American Journal of Botany, 87, 205-214.
Koul P, Koul AK, Hamal IA (1989). Reproductive biology of wild and cultivated carrot (Daucus carota L.). New Phytologist, 112, 437-443.
Liao WJ (廖万金), Zhang QG (张全国), Zhang DY (张大勇) (2003). A preliminary study on the reproductive features of Veratrum nigrum along an altitudinal gradient. Acta Phytoecologica Sinica (植物生态学报), 27, 240-248. (in Chinese with English abstract)
Lloyd DG (1973). Sex ratio in sexually dimorphic Umbelliferae. Heredity, 31(2), 239-249.
Lloyd DG (1979). Paternal strategies in angiosperms. New Zealand Journal of Botany, 17, 595-606.
Lloyd DG, Bawa KS (1984). Modificaion of the gender of seed plants in varying conditions. Evolutionary Biology, 17, 595-606.
Lovett Doust J (1980). Floral sex ratios in andromonoecious Umbelliferae. New Phytologist, 85, 265-273.
Lovett Doust J, Harper JL (1980). The resource costs of gender and maternal support in an andromonoecious umbellifer Smyrnium olusatrum L. New Phytologist, 85, 251-264.
Pickering CM (2001). Size and sex of floral displays effect insect visitation rates in the dioceiousAustralian alpine herb, Aciphylla glacialis (Apiaceae). Nordic Journal of Botany, 21, 1-9.
Qian YB (钱亦兵), Wu ZN (吴兆宁), Zhang LY (张立运), Zhao RF (赵锐锋), Wang XY (王小燕), Li YM (李有民) (2007). Vegetation-environment relationships in Gurbantunggut Desert. Acta Ecologica Sinica (生态学报), 27(7), 2802-2811. (in Chinese with English abstract)
Qin XM (秦雪梅), Shen GM (沈冠冕) (1990). The Taxonomic Studies on Xinjiang Ferula and Its Close Genera. Arid Zone Research (干旱区研究), 4, 23-32. (in Chinese with English abstract)
Samson DA, Werk KS (1986). Size-depedent effects in the analysis of reproductive effort in plants. The American Naturalist, 127(5), 667-680.
Solomon BP (1985). Environmentally influenced changes in sex expression in an andromonoecious plant. Ecology, 66, 1321-1332.
Solomon BP (1986). Sexual allocation and andromonoecy: resource investment in male and hermaphrodite flowers of Solanum carolinense (Solanaceae) . American Journal of Botany, 73, 1215-1221.
Spalik K (1991). On evolution of andromonoecy and ‘overproduction’ of flowers: a resource allocation model. Biological Journal of the Linnean Society, 42, 325-336.
Stócklin J, Paver P (1994). Effects of plant size and morphological constraints on variation in reproductive components in two related species. Epilobium Journal of Ecology, 82, 735-746.
Sutherland S (1986). Floral sex ratios, fruit-Set, and resource allocation in plants. Ecology, 67(4), 991-1001.
Tang LL (唐璐璐), Han B (韩冰). (2007). Effects of floral display pollinator behavior and pollen dispersal. Biodiversity Science (生物多样性), 15, 680-686. (in Chinese with English abstract)
Thompson JN. (1987). The ontogeny of flowering and sex expression in divergent populations of Lomatium grayi. Oecologia (Berlin), 72, 605-611.
Volkova PA, Rudakova VS, Shipunov AB. (2007). Sex tatios in populations of Geranium sylvaticum in European Russia. Plant Species Biology, 22, 125-128.
Webb CJ. (1979). Breeding systems and the evolution of Dioecy in New Zealand Apioid Umbelliferae. Evolution, 33(2), 662-672.
Webb CJ. (1980). Sex ratios in New Zealand apioid Umbelliferae. New Zealand Journal of Botany, 18, 121-126.
Webb CJ. (1981)a. Gynodioecy in Gingidia flabellata (Umbelliferae). New Zealand Journal of Botany, 19, 111-113
Webb CJ. (1981)b. Andromonoecism, protandy and sexual selection in Umbelliferae. New Zealand Journal of Botany, 19, 335-338.
Willson MF. (1983). Plant Reproductive Ecology. John Wiley and Sons, New York.
Zhang DY (张大勇). ( 2004). The Evolution of Life-history and Reproductive Ecology of Plants (植物生活史进化与繁殖生态学). Science Press, Beijing. (in Chinese).
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