Nitrogen Accumulation in the Roots of Tulip Plants (Tulipa gesneriana)

Origin of nitrogen accumulated in the tulip roots in winter season

“…About 93~o of Gln-N which accumulated in the roots was derived from absorbed LN. These results confirmed the former assumption that Gin with a high accumulation in the roots may be derived from the culture solution (OHYAMA et al 1985). As in the case of Gin, the value of the ratio LN/TN was very high in Asn, Glu, Ala, Ile, and Arg (70-90~o).…”

“…The bulbs were planted on October 26, and initially grown in deionized water to which Ca and B were added for 3 weeks. Then the plants were cultivated in a N-free culture solution of the same composition as that reported before (OHYAMA et al 1985(OHYAMA et al , 1988. 15N labeled NOa-(12 ppm N, 30 atom% 15N) and NH4 + (3 ppm, 30 atom~o ~SN) were added to the culture medium from December 14, and the plants were harvested on January I I.…”

“…Marta 7.7-7.8 g FW) were cultured in the same manner as described previously (OHYAMA et al 1985(OHYAMA et al , 1988. The bulbs were planted on October 26, and initially grown in deionized water to which Ca and B were added for 3 weeks.…”

Deficiency of N, P, K, Ca, Mg, or Fe Mineral Nutrients inNarcissuscv. “Garden Giant”

“…A high concentration of N was observed in roots at the sprouting stage. It is interesting to note that N-free treatment caused a significant decrease in N concentration, suggesting that during winter the N accumulated in roots may be derived from the N absorbed as in tulip roots (Ohyama et al 1985). The N concentration in the control roots decreased rapidly after sprouting and N may be used for rapid shoot growth.…”

Nutrients, Free Amino Acids, and Sugar Contents inNarcissusRoots Affected by N, P, K Deficiency during Winter

“…The composition of the amino acids was determined by HPLC (JASCO). The methods were described in detail previously (Ohyama et al 1985.…”