Effect of nitrogen salts on the growth of Ceratonia siliqua L. Shoot cultures

Abstract

Effects of reduced nitrogen salt nutriton on the growth, lenticel hypertrophy and anthocyanin accumulation of carob (Ceratonia siliqua L.) shoot cultures were investigated in conditions of light and darkness. Growth of shoot cultures was not significantly affected until nitrogen salts were reduced to less than ? of full-strength MS (Murashige and Skoog, 1962) values. Cultures in darkness were less affected and their main shoots even increased in length. Appearance of hypertrophied lenticels in light decreased, while in darkness they were absent in all treatments. Reduced nitrogen salt nutrition strongly affected anthocyanin accumulation of shoots and leaves, which greatly increased in both light and darkness. .Kod kultura izdanaka rogaca ispitivani su efekti smanjenja koncentracije azotnih soli u podlozi MS mineralnog rastvora na multiplikaciju i izduzivanje izdanaka, hipertrofiju lenticela i sintezu i akumulaciju antocijanina na svetlosti i u mraku. Smanjenje koncentracije N u podlozi bitno menja parametre rastenja izdanaka (multiplikaciju i izduzivanje) tek na ? (na svetlosti) tj. 1/10 (u mraku). Hipertrofirane lenticele se ne razvijaju na etioliranim izdancima gajenim u mraku dok su kod izdanaka gajenim na svetlosti brojne. Smanjenjem koncentracije N u podlozi broj HL se smanjuje kao i njihovo akropetalno prostiranje. Sinteza i akumulacija antocijanina u izdancima i listovima rogaca bila je direktno zavisna od koncentracije N u podlozi i na svetlosti i u mraku. .