Date of Award

Spring 1990

Document Type


Degree Name

Master of Science (MS)


Biological Sciences



Committee Director

Lytton J. Musselman

Committee Member

Gerald F. Levy

Committee Member

Paul J. Homsher

Call Number for Print

Special Collections LD4331.B46 W44


New chromosome counts are given for nine species of Striga including S. elegans (n=18), S. asiatica (n=19), S. forbesii (n=22), S. densiflora (n=26), S. aspera (n=27), S. passargei (n=28), and S. hermonthica (n=30). Previous counts reported for S. gesnerioides (n=20) and S. angustifolia (n=20) are verified. Evidence from the base number (x=10), chromosome counts, and differences in chromosome size (bimodality) suggests that the genus is an allotriploid with a descending aneuploid series. Genomic change appears to occur by different mechanisms in the Rhinanthoideae; some genera display a euploid series, others show aneuploidy, and some are very stable. Genera examined in the Orobanchaceae show stable numbers as well as euploidy indicating that different levels of genomic flexibility exist in the family.


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