Tropical lowland seed production of non-heading Chinese cabbage (Brassica rapa L. pekinensis Group) using vernalization and gibberelic acid
1997
Linwattana, G. | Protacio, C.M. | Mabesa, R.C. (Nan Horticulture Experiment Station (Thailand))
Vernalization of non-heading Chinese cabbage for eight days at 5 deg C induced earlier flowering by at least two weeks. Divernalization occurred when the vernalized plants were immediately exposed to high temperature of 30 deg C or higher even for just one day. Gibberrellic acid at 50-100 ppm applied two weeks after tranplanting for four weeks was not able to substitute for vernalization but a reduction in leaves, leaf size and in plant weight occurred. Similarly, vernalization suppressed the leaf length and width, and plant height by 26.3 percent and 46.8 percent, respectively, before the transition to reproductive stage. The combination of vernalization and gibberellic acid had a synergistic effect on seed yield. The time of harvesting as well as seed vigor and germination were not affected by any of the treatments applied
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