Yield distributions of spaced plants within Pensacola bahiagrass populations developed by recurrent restricted phenotypic selection

被引:8
作者
Burton, GW [1 ]
Mullinix, BG [1 ]
机构
[1] Univ Georgia, Coastal Plain Expt Stn, ARS, USDA, Tifton, GA 31793 USA
关键词
D O I
10.2135/cropsci1998.0011183X003800020008x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
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 E. 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.
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页码:333 / 336
页数:4
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