Influence of BAP on the growth of potato mother plants production in hydroponic system

Abstract

     Nowadays, there is demand of potato mother plant for pre-basic seed (G0) production. Therefore, we aim to study of influence of BAP on the growth of potato mother plant production in hydroponic system. This study was conducted in research center at the KhunWang Chiang Mai Royal Agricultural Research Center (CMRARC), Maewin, Maewang, Chiang Mai in cool seasons during 2017-2018. The experiment was designed using randomized complete block design (RCBD) with five treatments and three replications of differ 6-benzylaminopurine (BAP) concentrations; 0, 50, 100, 150 and 200 mg l^-1 production of mother plants hydroponic system. The box tray size in hydroponic system was 1 × 2.4 m for each treatment. The plantation space was 10 x 10 cm. The growth of mother plants in hydroponic system that treated with 50 mg l^-1 BAP after cutting 30 days was showed significant higher (27.7 cm) than other concentration. The growth rate of mother plant after planting 30 days was higher (0.57 cm d^-1) than BAP concentrations but did not significantly different with control. Moreover, the number of stem nodes (4 nodes) was different from other treatments. The stem cutting in 50 mg l^-1 BAP (264 shoots) in 2.4 m² area did not statistically significant in 200 mg l^-1 BAP, 100 mg l^-1 BAP, 150 mg l^-1 BAP and untreated. Therefore, 50 mg l^-1 BAP spray in potato foliar was appropriate hormone to increase the growth rate, number of shoot cutting and number of node in stem cutting of mother plant production in hydroponic system.