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Published in Crop Sci 15:221-224 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Pubescence and Its Use in Outcrossing Measurements Between a Crambe Hispanica Type and C. abyssinica Hochst. ex R. E. Fries1

L. C. Beck, K. J. Lessman and R. J. Buker2

The inheritance of glabrous vs. pubescent leaf type was studied in a plant introduction designated Crambe hispanica L. (PI 279346). Normally the species has densely pubescent leaves, but observations on a small sample of this introduction revealed one selection which segregated with respect to leaf type and another which produced all glabrous leaves. Further selections were made within each of these progenies. Selected plants were paired randomly with other C. hispanica types and crossed reciprocally to determine inheritance and potential of the trait as a genetic marker. Segregation ratios in 44 F2 families involving 4,004 seedlings indicated that pubescent leaf was controlled by a single recessive gene p.

Glabrous leaf was used as a dominant marker in measuring percent outcrossing between C. abyssinica Hochst. ex R. E. Fries and C. hispanica types. Four normally glabrous C. abyssinica pollinator lines were planted in a circular row design with a pubescent C. hispanica type line planted in concentric rows outside each pollinator row. Row spacings were 50.8, 76.2, and 101.6 cm from the pollinator row with each spacing in a different subunit. To determine wind affects on pollen dispersal, circles were divided into four segments corresponding to northeast, northwest, southwest, and southeast quadrants.

Differences in outcrossing due to pollinators and to row spacings were found. Outcrossing over the various treatment combinations ranged from 0.5 to 7.0% with a mean of 2.7%.

Key Words: Genetic marker • Leaf Pubescence • Pollinator effect • Row spacing • Wind pollination

1 Contribution from the Dept, of Agron., journal paper no. 5603, Purdue U. Agr. Exp. Stn. Submitted by the senior author in partial fulfillment of a M.S. degree, Purdue U., W. Lafayette, IN 47907. This work was supported in part by ARS, USDA coop. agreement no. 122-14-100-10, 456(34) administered by the Plant Sci. Res. Div., Beltsville, MD.

2 Former graduate assistant (now with Clyde Black & Son, Inc., Ames, Iowa; professor of agronomy, Agron. Dept., Purdue U.; and executive vice-president and general manager, Farmers Forage Research Coop., W. Lafayette, IN 47906.

Received for publication July 26, 1974.




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