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Yield Distributions of Spaced Plants within Pensacola Bahiagrass Populations Developed by Recurrent Restricted Phenotypic Selection
Author(s) -
Burton G. W.,
Mullinix B. G.
Publication year - 1998
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1998.0011183x003800020008x
Subject(s) - paspalum notatum , biology , population , perennial plant , agronomy , selection (genetic algorithm) , yield (engineering) , horticulture , botany , demography , materials science , artificial intelligence , sociology , computer science , metallurgy
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.