Effect of potassium chlorate on floral induction of cold-requirement vegetable crops In Vitro
2001
Nopmanee Topoonyanont(Maejo University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Paweena Nuamjaroen(Maejo University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Penrat Hongvitayakorn(Maejo University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Phawin Manochai(Maejo University, Chiang Mai (Thailand). Faculty of Agricultural Production. Department of Horticulture) | Sirirat Chongsaeng(Maejo University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Somboon Anuntalabhochai(Chiang Mai University, Chiang Mai (Thailand). Faculty of Science. Department of Biology)
Factors involving on floral induction of spinach (Spinacia oleracea) and Chinese cabbage (Brassica campestris var. pekinensi) were investigated including concentrations of potassium chlorate (KClO3) (25, 125, 250, and 500 micro g/l), 5-azacytidine (25, 125, 250, and 500 micro g/l) and low temperature (10 deg C) exposure for 5, 10, 15 and 20 days, compared to the untreated one. The results showed that in spinach, plants treated with KClO3, 5-azacytidine and low temperature exposure for 15-20 days showed similar results in both reducing days of flowering and increasing percentage of flowering, in comparison to non-treated one. While in Brassica campestris, both vegetative growth and floral induction were also affected by these factors. The prolonged period of low temperature exposure could promote percentage of bolting, floral induction and flower morphogenesis KClO3, as well as 5-azacytidine could increase percentage of bolting plant and floral induction but flower morphogenesis were not observed. The non-treated plants remained rosette all the experimental period.
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