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Articles by Chalermpol Kirdmanee
Total Records ( 2 ) for Chalermpol Kirdmanee
  Suriyan Cha-um , Nguyen Thi-Thanh Hien and Chalermpol Kirdmanee
  The aim of present study is to find-out the meristem size of sugarcane varieties related to disease-free with a high recovery percentage. In vitro plantlets of four sugarcane varieties, Khonkan1, K97-29, KPS94-13 and K84-200, were cultured on modified-MS media. Meristem-tips were excised under stereomicroscope in different sizes, 0.5, 1.0 and 1.5 mm and cultured on modified-MS media under darkness. The meristem tips (0.5-1.5 mm) in all varieties were eliminated from bacteria and fungi, except those tips of K97-29 in size 1.0 and 1.5 mm showed 1.65 and 2.5% bacteria contamination. Recovery percentages were positively related to meristem size of K97-29 (R2 = 0.60), KPS94-13 (R2 = 0.77) and K84-200 (R2 = 74) varieties, but Khonkan1 variety dose not correlated (R2 = 0.23). In the largest size, the recovery percentages of KPS94-13 and K84-200 varieties were higher than those of Khonkan1 and K97-29 varieties for 2 folds. It should be concluded that the sizes of sugarcane meristem tips and varieties would play a key role on the disease-free production.
  Suriyan Cha-um and Chalermpol Kirdmanee
  The aim of this study is to develop a novel technique for reproductive induction of Thai indica rice grown under environmental control system. Flower time of aroma rice cultivars, jasmine (KDML 105) and Homjan (HJ) were directly induced by 8 h photoperiod flux in both a month exposure and long-term exposure as short-day photoperiod sensitive. The growth characteristics, including plant height, leaf length, leaf area and flag leaf area, were highly regulated by short-day photoperiod. As well as, the Short-Day (SD) photoperiod (8-10 h day-1) was strongly enhanced on rice flowering over crop maturity and positively related to flag leaf area. On the other hand, the flower time of Pathumthani 1 (PT1) rice was initiated in all treatments as SD insensitive or day natural rice. In addition, the maturity or prolong the Day after Plantation (DAP) strongly stimulated on PT1 rice flowering over photoperiod treatments. The basic knowledge of this investigation was successfully applied to induce the flower in 7 lines of F1 salt-tolerant rice population. It should be further used for rice pure-line production in a short period of breeding program.
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