Role of nitrogen accumulated in tulip roots during winter season

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

“…These results suggest that most of the N accumulated in roots was derived from the N absorbed from the medium, because the N level in the roots with --N treatment was very low. Active absorption and high accumulation of N in roots during winter seem to be a common characteristic in autumn flower bulbs of tulip (Ohyama et al 1988a), hyacinth , and narcissus. In the control, narcissus roots accumulated N almost equally in the soluble fraction (56% of total N) and insoluble fraction (44% of total N).…”

“…Phosphorus and potassium are applied before planting, and nitrogen is top-dressed just before crop emergence (De Hertogh and Le Nard 1993). Ohyama et al (1988a) reported that roots of tulip accumulate a large amount of N during winter which can be used for rapid shoot growth after sprouting. Hyacinth roots also accumulate a large amount of N and K during the underground period in winter ).…”

Effect of cold storage treatment for forcing bulbs on the C and N metabolism of tulip plants

“…In addition, it is known that the N stored in the form of protein and free amino acids in the bulb scales is very important for root and shoot growth (ZACrlARtUS et al 1957;OHYAMA et aL 1988b). BABA et aL (1979) recommended that the N concentration in the bulb should be higher than 1.27o DW for the forcing cultivation of tulip plants.…”

Origin of nitrogen accumulated in the tulip roots in winter season

“…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.…”