International Journal of Environmental Science and Development

Abstract—The effects of plant growth stimulating substances like naphthalene-acetic acid (NAA), Gibberellic acid 3 (GA3) and 6-benzylaminopurine (6-BA), or plant growth inhibiting substances like abscisic Acid (ABA) and [(2-chloroethyl) trimethylammonium chloride] (CCC), or their combinations, on biomass and lipid production in Pinnularia gibba var. linearis and Chaetoceros gracilis were studied. When applied at day 1 (stage I), treatments with NAA, GA3 and 6-BA or their combinations enhanced biomass production but reduced lipid contents. The total lipids, however, were higher in these treatments than that in the control. 6-BA was more effective in stimulating total lipid production. No difference was found among the treatments with NAA, GA3 or their combination. Adding NAA or GA3 to 6-BA did not enhance biomass or lipid production compared with 6-BA alone. When applied at day 4 (stage II), growth stimulating substances increased biomass production compared with the control but did not affect total lipid production. Less biomass was obtained when the treatments were applied at day 4 compared with that applied at day 1. Treatments with growth inhibitors like ABA, CCC or ABA + CCC at day 1 reduced biomass production and total lipids, although lipid contents were increased by the treatments. When treated with ABA, CCC and ABA + CCC at day 4 , however, they did not reduce biomass production while increased lipid contents and total lipids.

Index Terms—Plant growth regulator biomass lipids micro algae diatoms.

The authors are with Rizhao Polytechnic College, Shandong Province, China (e-mail: tanggufusang@163.com; lixiaoding65@163.com; kangjunli@163.com; needf@163.com; zwgt@163.com; angelalee123@163.com; ).

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Cite:Zhiguo Ju, Lixiao Ding, Kangjun Li, Zhen Ding, Qingna Zhang, and Yuan Li, "Effects of Plant Growth Substances on Biomass and Lipid Production in Diatoms," International Journal of Environmental Science and Development vol. 4, no. 5, pp. 452-455, 2013.