Онтогенетичнi змiни вмiсту ксантофiльних пiгментiв у листках ярої пшеницi залежно вiд рiвня азотного живлення

Abstract

The dynamics of the content of various xanthophyll pigments in leaves of spring wheat during vegetation at two contrast levels of nitrogen supply was investigated. At a high level of nitrogen nutrition, the contents of violaxanthin, lutein, neoxanthin, anteraxanthin, and zeaxanthin per 1 dm2 of the leaf surface increased from tillering to milk grain ripening. At a low level of nitrogen nutrition, the increase was less intensive, and the period of its rising was shorter (limitation by the phase of earling). The contents of violaxanthin, lutein, and neoxanthin per 1 mg chlorophyll were risen during vegetation and did not depend on the level of nitrogen supply. But the relative content of zeaxanthin was higher at nitrogen deficit nutrition. The results testify to the close interrelation between the contents of xanthophylls and chlorophylls and to the increase of the defensive role of zeaxanthin under stress conditions induced by nitrogen deficit.