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Physical Restriction of Pod Growth Alters Development of Soybean Plants

Dipartimento Produzione Vegetale e Tecnologie Agrarie, Universitá di Udine, Via delle Scienze 208, 33100 Udine, Italy
USDA-ARS, Western Cotton Research Lab., 4135 East Broadway, Phoenix, AZ 85040
Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091

^* Corresponding author.

Efforts to determine the mechanistic relationships between fruit and canopy development are complicated by difficulties in designing nondestructive treatments that modify plant-sink development. Pod growth was physically restricted by placing plastic straws, referred to as plastic pod-restriction devices, over 0,50, or 100% of the soybean (Glycine max L. Merr.) pods in greenhouse experiments. The objective was to determine how decreases in pod growth influenced whole-plant growth and development. Both the rate and final accumulation of seed dry matter were decreased by restricting pod growth. Conversely, restricting pod growth increased seed number due to increased production and decreased abscission of fruits. Plant dry matter and N accumulations during the linear seed-fill period were not affected by restricting pod growth. This resulted from proportional increases in partitioning of assimilates into stems and leaves. Thus, decreases in reproductive growth apparently did not cause feedback inhibition of photosynthesis. Although leaf abscission was delayed by restricting pod growth, dry matter and N accumulation late in development were affected only slightly. In general, restricting pod growth influenced plant development and assimilate allocation in a similar manner as physical removal of fruits. The inverse relationship between the rate of dry matter accumulation in seed and pod and seed number per plant indicated that assimilate availability (united seed number. The delay in leaf yellowing and abscission induced by physically restricting pod growth suggested that the completion of monocarpic senescence was directly affected by changes in the rate of seed dry matter accumulation per plant.

Received for publication July 18, 1994.

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