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Articles by K. Lertrat
Total Records ( 3 ) for K. Lertrat
  P. Kesornkeaw , K. Lertrat and B. Suriharn
  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.
  S. Simla , K. Lertrat and B. Suriharn
  To supplement the selection for qualitative traits, the quantitative study by generation means analysis was carried out. The aim of this study was to determine gene effects for sugar contents (sucrose, glucose, fructose and total sugar) in two waxy corns crosses (101sux101bt and 101sux216sh2-crosses). Three inbred lines (101su, 101bt and 216sh2) homozygous in waxy gene were used as parents to generate six basic populations (P1, P2, F1, F2, BC11 and BC12). Eleven entries were planted in a randomized complete block design with three replications. The sugar contents were evaluated en masse from immature kernels at 21 days after pollination. The data were used in generation means analysis to understand gene effects. Dominance and epistatic gene effects explained most of genetic variation for sucrose and total sugar in both crosses. Negative dominance gene effect indicated that sugar content in the F1 hybrids were not as high as that of their parents. Significant additive gene effect also indicated the synergistic effect of the sweet gene combinations. Based on the results, backcross or three-way cross is the best choice to increase sweetness in waxy corn and the use of gene combinations is better than single gene. This information is useful for planning breeding strategies for improving sweetness in waxy corn.
  S. Simla , K. Lertrat and B. Suriharn
  Six varieties of vegetable waxy corn (Zea mays var. ceratina) popular among growers and consumers in Thailand were analyzed for their carbohydrate compositions at different harvest times from 15 days after Pollination (DAP) to maturity and a corn variety was stored at different durations. All sugar compositions increased with Days after Pollination (DAP) to the peak and then declined, whereas total starch, amylopectin and phytoglycogen compositions increased with DAP and were highest in mature kernels. The accumulation timings of carbohydrate compositions were different among varieties and compositions. Suitable harvest times can vary between 17 and 25 DAP. The highest harvest durations were observed in Tien Baan Kao and Big White 852 being 9 and 7 days, respectively. Storage of waxy corn under ambient conditions resulted in rapid loss of sugar contents, whereas total starch, amylopectin and phytoglycogen were increased. Low storage temperature is required to maintain shelf-life of waxy corn products. These varieties are highly recommended for commercial production and can be used as germplasm sources for waxy corn improvement.
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