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Effects of NaCl and KNO3concentrations on the abscisic acid content ofDunaliellasp. (Chlorophyta)

✍ Scribed by Noriko Tominaga; Makiko Takahata; Hiroyuki Tominaga

Publisher
Springer
Year
1993
Tongue
English
Weight
563 KB
Volume
267
Category
Article
ISSN
1573-5141

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✦ Synopsis

Abscisic acid (ABA) is a hormone which has a number of roles during the life cycle of a plant. We demonstrated the occurrence of ABA in a halotolerant green alga, Dunaliella sp. isolated from a salt pond near Adelaide, South Australia, using thin layer chromatography (TLC), high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS). The variation of cellular ABA and protein content during the growth of an axenic clonal culture of Dunaliella sp. was investigated under different concentrations of NaCl and KNO,.

Experimental results can be summarized as follow: (1) ABA content was changed with the growth stage of culture: A rapid increase in ABA content was observed in the logarithmic phase. After this, the content rapidly decreased to very low values. (2) ABA content was also affected by the NaCl concentration. The content had a minimum value at the NaCl concentration (15%) where growth rate was maximal, and higher values at higher or lower concentrations of NaCl. (3) The ABA content also increased with decreasing nitrogen concentration of the medium.

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