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Asian Journal of Plant Sciences
Year: 2009  |  Volume: 8  |  Issue: 6  |  Page No.: 425 - 432

Response to Four Cycles of Mass Selection for Prolificacy at Low and High Population Densities in Small Ear Waxy Corn

P. Kesornkeaw, K. Lertrat and B. Suriharn    

Abstract: Four cycles of modified mass selection for prolificacy in Tein Luang Nong Bua population of small ear waxy corn at low and high population densities (62,500 and 125,000 plants ha-1) were completed in 2006. The initial population and eight improved populations were evaluated at two planting densities. The objectives were to evaluate the responses of these populations to population density and to estimate selection responses of improved populations for agronomic characters and ear traits. Number of ears per plant increased from 1.75 at cycle 0 to 1.84 at cycle 4 with average rates of gain per cycle of 0.03 ears per plants at low planting density. At high planting density, the average ears per plant increased from 1.75 at cycle 0 to 1.99 at cycles 4 with average rates of gain per cycle of 0.05 ears per plants. Mass selection at high population density resulted in higher response than the one at low population density (increased by 0.07 vs. 0.05 and 0.03 vs. 0.02 ears per plant cycle-1 for low and high planting densities, respectively). Correlated response to selection was observed in both low and high planting densities for plant high (2.9** and 2.8**), ear height (b = 2.3 * and 2.5*), days to tasseling (b = 0.48* and 0.53*) and days to silking (0.53* and 0.41*). It could be concluded that mass selection under both high and low plant densities could increase number of ears and selection under high plant density was more effective than under low plant density.

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