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Evaluation of the Afila-Tendriled Acacia (afaf-tactac) Pea Foliage Type under Minimal Competition

Dep. of Agronomy, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

Earl T. Gritton and Patrick J. Flannery

Dep. of Agronomy, 1575 Linden Dr., Univ. of Wisconsin-Madison, Madison, WI 53706-1597

^* Corresponding author.

The afila (of) gene replaces pea (Pisum sativum L.) leaflets with tendrils, and the tendriled-acacia (tac) gene restores small leaflets to the tendrils of af plants. The agronomic performance of plants homozygous for both af and lac has not been studied. A near-isogenic set of three foliage types: normal (AfAf-TacTac), semi-leafless (afaf- TacTac), and afila-tendriled acacia (afaf-tactac) in three genetic backgrounds was evaluated for 2 yr in two locations using a normal plant population for pea grown for processing. The objective of the study was to measure performance of afaf-tactac in comparison with afaf-TacTac and AfAf-TacTac at high levels of interplant competition. At the green pea harvest stage, the total foliage area of afaf-tactac plants was 10% greater than for afaf-TacTac, but not significantly different from AfAf-TacTac. Yield of afaf-tactac averaged 29% lower than AfAf-TacTac and 26% lower than afaf-TacTac in the early and midseason genetic backgrounds, but did not differ significantly in the late genetic background. Significant increases in vine length, number of nodes, lowest pod-bearing node, and first node with nonsenescent foliage were measured in afaf-tactac over AfAf-TacTac and afaf-TacTac in the early and midseason genetic backgrounds. The addition of leaflets to the tendrils of a/a/plants through incorporation of the tac gene did not result in green pea yield improvement of plants grown at a standard highly competitive population density.

Received for publication March 27, 1991.