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Mem 117 c22-cycad sex ratios at montgomery botanical center. sold by nybgshop.org for $4.99

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This purchase only includes chapter 22 of this title.

Abstract

The living and historical ground collection at Montgomery Botanical Center (MBC) was examined in order to evaluate cumulative sex ratios for individual genera and the collection as a whole. The analysis, which included 4,932 individual cycads comprising all 10 genera, uncovered a significant male bias (P < 0.5) in the collection as a whole as well as in the genera Bowenia and Cycas. This bias is presumed to be the result of male plants producing strobili at an earlier age than female plants in a collection that still has many juvenile plants. When the collection as a whole was examined including only accessions in which 100% of individuals had produced strobili, a male-biased sex ratio was observed in Cycas, Lepidozamia, and the collection as a whole, while a female-biased sex ratio was observed in Stangeria eriopus. The biased sex ratios in Stangeria and Lepidozamia are likely the result of low sample sizes, but in both analyses, the genus Cycas was strongly male biased. The earlier production of strobili by male plants compared with female plants was illustrated with a cohort of 35 seed-grown Zamia furfuracea. The effect of time of year in observed sex ratios was illustrated by examining the monthly sex ratios of a cohort of 28 Zamia nesophila plants with a 1:1 genotypic sex ratio for a year. The observed sex ratio varied widely and only reflected the genotypic sex ratio for one month. The above observations suggest that the observed sex ratios may vary widely in wild populations and ex situ collections d




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