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Yield Distributions of Spaced Plants within Pensacola Bahiagrass Populations Developed by Recurrent Restricted Phenotypic Selection

USDA-ARS, Univ. of Georgia Coastal Plain Experiment Stn. and USDA, ARS
Univ. of Georgia Coastal Plain Experiment Station, Tifton, GA 31793

^* Corresponding author (E-mail: forage{at}tifton.cpes.peachnet.edu).

Pensacola bahiagrass (Pb), Paspalum notatum Flugge var. saure Parodi, is a warm season perennial sward grass grazed by livestock on more than a million hectares in the southeastern USA. This research was designed to evaluate the 5-yr effect of recurrent restricted phenotypic selection (RRPS) on the average yield and the distribution of spaced plant yield (SPY) components within broad-based Population A and narrow-based Populations B and E. RRPS Cycles 0, 9, and 18 in Population A, and Cycles 0, 5, and 10 in Population B produced 5-yr average spaced-plant-population progress (SPPP) yields of 364, 1014, 1767, 823, 1158, and 1427 g plant^>–1, respectively. The average SPY increase in Population A proceeded at the same rate from RRPS Cycles 16 to 22 as from 0 to 16 previously reported. The average SPY increase proceeded at a faster rate at RRPS Cycles 5, 6, and 7 for very narrow based Population E than for Populations A and B. Comparison of SPYs from different cycles in the 5-yr SPPP tests revealed that RRPS increased the number of high yielding plants and reduced the number of low yielding plants in successive cycles. RRPS Cycle 18 of Population A that produced two plants yielding 4540 g in the SPPP test had 27 plants weighing only 454 g. Seven, 14, and 22 cycles of RRPS were required to create plants with SPYs yielding 4086 g in 100-plant populations of E, B, and A, respectively.

Received for publication January 2, 1997.

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