Effects of recurrent selection for increasing seed size in sesame
1992
Jirawat Sanitchon | Prasit Jaisil | Sanun Jogloy (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Recurrent selection was applied for sesame population improvement at Khon Kaen University. Sixty sesame lines were used for synthesized based population. Three cycles of recurrent selection were performed with the aim to increase the seed size of sesame. In each cycle, 30 percent selection intensity was practiced. The responses to selection were evaluated on three cycles of sesame population (C0, C1 and C2) with two check varieties (MK 60 and CB 80) in three environments. The response to selection of seed size was linear with positive regression coefficient. Estimate of the progress per cycle was 0.145 g for increasing seed size. Recurrent selection has been shown as an effective method to increase the seed size of sesame with the least effects on other characters. It should be possible to extract the large seed size lines from the improved population. These lines may be released as new varieties or used as parental lines in breeding program. Recurrent selection is a cyclical scheme of plant selection by which frequencies of favorable genes are increased in plant populations. The method was developed primarily for the improvement of quantitatively inherited traits. The basic objective of recurrent selection method is to increase the frequency of desirable genes in a population so that the opportunities to extract superior genotypes are enhanced. Recurrent selection has proven to be an effective procedure for the improvement of quantitative traits in both self-pollinated and cross-pollinated crops.
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