Application of new microbial formulation for increased glucosinolate content against heavy rain and diseases of Kale Crop
2011
Hemsanit, N. | Kasem, S., Kasetsart Univ., Bangkok(Thailand). Dept. of Plant Pathology | Thowthampitak, J., Kasetsart Univ., Bangkok(Thailand). Dept. of Entomology | Prathuangwong,S., Kasetsart Univ., Bangkok(Thailand). Dept. of Plant Pathology
Resistance effects of seed bacterization and 3-foliar sprays (at 14, 21 and 28-day-old plants) with new Pesudomonas fluorescens SP007s kaolin-based formulation developed in this study (the KUwin/Gap Sp007s) on diseases and heavy rain in correlation with glucosinolate accumulation in treated plants were evaluated in conventional system of kale (Brassica oleracea var. alboglabra) production during 23 January to 27 March 2010 at Banpan, Angthong with RCBD arrangement. The 15-day-old seedlings of seeds treated with the new Sp007s product had the highest reduction in 3-naturally endemic diseases of black rot (caused by Xanthomonas campestris pv. campestris), Alternaria leaf spot (Alternaria brassicicola), and downy mildew (Peronospora parasitica) compared to another bioproduct (ISR-PISP007s), chemical (Funguan), conventional practices, and non-treated control (P=0.05). Maximal glucosinolate accumulation (sinigrin and glucoiberin) detected by HPLC was observed with 22.6 u mol/g when 35-day-old treated plants were exposed to 7-day-heavy rain (91.8mm). Evaluation of the 3 diseases (black rot, Alternaria leaf spot, and downy mildew) of this same growth stage of KUwin/Gap Sp007s-treated plants was also reduced with 96, 88, and 82% respectively compared to non-treated control. Seedling vigor and yield were positively correlated with disease reduction and increased glucosinolate accumulation. This study suggests that the new microbial product reduces three diseases by 82-100% at harvest and induces plant tolerance to heavy rain which could be explained by total glucosinolate content (P=0.05).
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