Gibberellin Aj in Water Sprouts of Citrus 487 



tained which, on crystallization from ethanol-ethyl acetate-ligroin, 

 gave about 2 mg. of colorless prisms. These crystals melted at 230° 

 to 236° C. (decomposition) on a Koffler block, and then infrared 

 spectrum (Nujol) coincided with that of gibberellin A^ (Figure 1). The 

 infrared spectra of the methyl esters of these compounds again dem- 

 onstrated the identity of the Citrus gibberellin with gibberellin Aj 

 (Figure 2). 



SUMMARY 



Gibberellin A^ was isolated from the elongated water sprouts of a 

 bud variation of Citrus unshiu. Its identity was established from in- 

 frared spectra and physiological properties. 



LITERATURE CITED 



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