Study On The Chemical Constituents Of Alfalfa For Stress Resistance In The Plant

In order to get a better understanding of the stress resistance in alfalfa (Medicago sativa L.)and lay a sound foundation for the development of new plant growth regulators, the chemical constituents of the plant and their plant growth regulating effects were studied in detail. Sixteen compounds have been isolated from the aerial parts of alfalfa, and their structures were established, by using spectral techniques, as benzoic acid, salicylic acid, vanillic acid, β-sitosterol, uracil, cyclo(L-Leu-L-Ile), cyclo (L-Pro-L-Ala), cyclo (L-Pro-L-Leu), cyclo(D-Pro-L-Val), chrysoeriol, apigenin, tricin, 7,4'-dihydroxyflavone, coumestrol, sativol and D-pinitol. Among them, cyclo(L-Leu-L-Ile), cyclo(L-Pro-L-Ala), cyclo(L-Pro-L-Leu) and cyclo(D-Pro-L-Val) were all isolated from Medicago sp. for the first time.Bioassay experiment indicated that the phenolics and flavonoids tested could slightly promote the seedling growth of wheat (Triticum aestivum L.) in relatively low concentration, and the promoting activities rightly turned into...