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| Author(s): | Quinn, James A. |
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| Author Affiliation: | Department of Biological Sciences, Rutgers University, Piscataway, New Jersey 08855-1059 |
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| Title: | Evolution of dioecy in Buchloe dactyloides (Gramineae): Tests for sex-specific vegetative characters, ecological differences, and sexual niche-partitioning |
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| Source: | American Journal of Botany. Vol. 78, No. 4, April 1991, p. 481-488. |
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| Publishing Information: | Columbus, OH: Botanical Society of America |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: Bouteloua dactyloides; Sex form composition; Evolution; Ecology; Reproduction; Rust; Disease susceptibility; Biomass; Growth habit; Soil requirements; Competition
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| Abstract/Contents: | "Buchloe dactyloides is a perennial dioecious grass in which male and female inflorescences are so strikingly dimorphic that they were origianlly assigned to different genera. The objective of this paper is to present the results of tests for sex-specific vegetative characters, ecological differences, and sexual niche-partitioning, combining them with prior information on the reproductive biology of Buchloe for an evaluation of the key factors leading to the evolution of dioecy and sexual dimorphism. Field and greenhouse data were collected from Oklahoma and Kansas populations on vegetative characters, allocation to reproduction, and relative growth and competitive success along resource gradients. Except for greater susceptibility to leaf rust by males, there were no significant differences between males and females in vegetative characters, total biomass, or reproductive effort. Field studies of spatial distributions of males and females failed to show any relation to soil, topography, or soil moisture. In a 45-month greenhouse experiment starting at the seedling stage, the relative growth and competitve success of randomly paired individuals showed no evidence for differential competitive success or for niche-partitioning of males and females. The 'outcrossing advantage' and subsequent sexual specialization of the female inflorescence appear to be the major factors underlying this dimorphic system." |
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| Language: | English |
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| References: | 70 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Quinn, J. A. 1991. Evolution of dioecy in Buchloe dactyloides (Gramineae): Tests for sex-specific vegetative characters, ecological differences, and sexual niche-partitioning. Amer. J. Bot. 78(4):p. 481-488. |
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