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Leaf Azimuthal Orientation of Sorghum in Four Row Directions¹

The objective of this study was to determine if the leaf azimuthal orientation of grain sorghum (Sorghum bicolor (L.) Moench) was at random. Plants were grown in each of four row directions, North-South (N-S), Northeast- Southwest (NE-SW), East-West (E-W), and Northwest- Southeast (NW-SE). In 1972, from 8 to 16 August, there was a strong bimodal azimuthal orientation which was either east-west or perpendicular to the rows. In addition, there was a significantly larger proportion of leaves to the south of the east-west axis than to the north. In 1973, three readings were taken: 17 or 18 July, 2 or 3 August, and 29 or 30 August. On the earliest sampling, a significant proportion of leaves faced west rather than east. Orientation was altered with the emergence of the flag leaves, of which 60% faced east. We concluded that leaf orientation was not distributed randomly either year.

Key Words: Sorghum Bicolor L. Moench

² Formerly graduate research assistant (now assistant professor, Dep. of Agronomy, New Mexico State Univ., Las Cruces, NM 88003); associate professor and professor of agronomy, respectively, Colorado State Univ.

Received for publication August 26, 1980.