4-Chloroindole-3-acetic acid (4-Cl-IAA) is a halogenated plant auxin plant growth regulator that has been found in P. sativum.1 It induces tobacco callus growth and biologically active alkaloid production in Duboisia root cultures when used at a concentration of 0.1 mg/ml. 4-Cl-IAA (1 µM) reduces heat stress-induced grain loss in wheat (T. aestivum).2
1.Reinecke, D.M.4-Chloroindole-3-acetic acid and plant growthPlant Growth Regul.273-13(1999) 2.Abeysingha, D.N., Ozga, J.A., Strydhorst, S., et al.The effect of auxins on amelioration of heat stress-induced wheat (Triticum aestivum L.) grain lossJ. Agron. Crop. Sci.207(6)970-983(2021)