Evaluation of the Afila-Tendriled Acacia (afaf-tactac) Pea Foliage Type under Minimal Competition
- Irwin L. Goldman ,
- Earl T. Gritton and
- Patrick J. Flannery
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.
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