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Published in Crop Sci 24:699-703 (1984)
© 1984 Crop Science Society of America
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Peduncle Elongation in Dwarf and Normal Height Oats1

F. L. Kolb and H. G. Marshall2

Dwarf oat (Avena sativa L.) lines with stiff straw are of interest because of their potential use as parents in the development of semidwarf cultivars. This study was conducted to obtain basic information about the relationship of peduncle cell length and cell number to the height of dwarfs. Two dwarf oat lines (NC 2469-3 and OT 207) were studied and compared to the conventional height lines (NC 2469 and OT 184) from which the dwarfs were derived. Peduncles from primary culms of greenhouse grown plants were measured throughout peduncle elongation. The frequency of mitotic figures in the intercalary meristem was determined. The length of parenchyma cells was measured in longitudinal sections from three regions of fully elongated peduncles. The rate of peduncle elongation of OT 184 was faster than that of the dwarf OT 207. The percentage of dividing cells in the intercalary meristem in OT 207 (5.0%) was less than that of the parental line OT 184 (7.3%). NC 2469-3 and NC 2469 did not differ in the frequency of mitotic figures in the intercalary meristem and differed only slightly in the rate of peduncle elongation. NC 2469-3 had significantly shorter cells in the upper regions of fully elongated peduncles than NC 2469. The reduced peduncle length of NC 2469-3 resulted largely from these shorter cells, but reduced cell number also may have contributed to reduction in peduncle length. In contrast, the parenchyma cells in the middle and upper regions of the dwarf OT 207 peduncle were not different in length from those of OT 184. The cells at the base of the peduncle of dwarf OT 207 were longer than those of OT 184. Therefore, the shorter peduncles of OT 207 were due primarily to fewer cells per peduncle file.

Key Words: Avena sativa L. • Cell length • Cell number • Culm • Intercalary meristem • Internode • Mitosis • Plant height • Stem

1 Contribution from the Center for Cereals Research at The Pennsylvania State Univ., University Park, Pa. 16802. Cooperative investigation of USDA-ARS and the Dep. of Agronomy, The Pennsylvania Agric. Exp. Stn. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree. Approved for publication 22 Mar. 1983 as paper no. 6646. Journal Series.

2 Geneticist and research agronomist, respectively, USDA-ARS, University Park, Pa.

Received for publication April 14, 1983.




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