Date of Award

Summer 1980

Document Type


Degree Name

Master of Science (MS)


Biological Sciences



Committee Director

Lytton J. Musselman

Committee Member

Paul W. Kirk, Jr.

Committee Member

Frank P. Day, Jr.

Call Number for Print

Special Collections LD4331.B46 S63


Orobanche minor Smith is an introduced root parasite that is known to attack some commercial crops. Germination occurs only after a preconditioning period involving moisture which must be followed by a chemical stimulant produced by the host root. Strigol and strigol analogs (GR-compounds} have been reported to germinate some species of Orobanche. Statistical tests indicate a significant difference between the effectiveness of strigol, GR-7 and GR-45 (P = 0.001).

The embryo is an undifferentiated mass of cells. During germination, the radicular pole of the embryo differentiates into the radicle, while the plumular pole remains undifferentiated. The radicle forms the primary haustorium and tubercle. A shoot and roots develop from the tubercle. The primary and secondary haustoria develop a storied cambium around the host vessels. All host tissue in the haustorial region, except the vessels, are sloughed off by the growth of the storied cambium and its derivatives.


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