IRRIGATION, SPACING, AND SHADING ON LEAF AND ROOT GROWTH AND THE ACCUMULATIO ' OF 3,7, 3'-TRIHYDROXY-4'-METHOXYFLAVONE AND STIGMA-STEROL IN TUBERO S ROOTS OF RED K,VAO KRUA
Keywords:
Butea superba Roxb, cultivations, leaf and root growth, flavone, stigmasterolAbstract
An experiment was conducted in Red Kiao Krua (Butea superba Roxb) at Suranaree University of Technology during 2002 - 2004. A split-split plot arrangement of treatmnents in a RCBD with 3 blocks was designed to study the effects of irrigation, spacing and light shading on leaf area, fresh and dry weight of the tuberous roots, and the photosynthesis rate of the Red Kwao Krua (RKK). The accumulations of stigmasterol and 3,7,3'-trihydrory-4'-methory-Lavone in the tuberous roots of RKK were also determined at the ages of 6, 8, 10, 12, and 14 months. The mnain plot treatmnents were irrigation at 3 day intervals, 7 day intervals, and rainfed condition as a control. The sub-plot treatnents were spacing at 1.5 m X 1.5 mn and 3 m X 3 mn. The sub-sub plot treatmnents were shading at 70% and non-shading. The experiment was replicated 3 tines. The spacing and shading did not have any effects on leaf area, tuberous root weight, and the photosynthetic rate at any plant ages studied. However, the irrigation regimes had an effect on the leaf area, tuberous roots weight, and photosynthesis rate of RKK at the ages of 12 and 14 months. The 3,7,3'-nihydrory-4'-mnethosyfarone was not found at any treatmnents and at any plant ages studied. However, the tuberous roots of RKK at the ages of 12 and 14 months that were inrigated at 3 day intervals and 7 day intervals accumulated stigmasterol at the level of 500 - 1,000 ppm. The irrigation regime was a significant factor increasing the amount of stigmas- terol in the tuberous roots of RKK.
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