^<15>N STUDY ON THE FATE OF FOLIARLY APPLIED UREA NITROGEN IN TEA PLANT : Camellia sinensis L.

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概要

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• The fate of foliarly applied urea-N in 1-year-old tea plants was investigated by applying ^<15>N-labeled urea to the shoots 3 times during 5 days. On the next day (Day 1) of the final urea application, a large part of applied-N was retained in the form of N compounds soluble in 80%-ethanol solution in the leaves, and after 7 days (Day 7) the percentage of applied-N in the insoluble fraction increased, suggesting that the applied-N was utilized for protein synthesis. The percentage of applied-N translocated to the roots was very small, only a few percent, of which more than 70% was found in the insoluble fraction. The percentages of N derived from applied urea in N contained in glutamine and arginine were high on Day 1 in the leaves, but on Day 7 those in glutamine became lower, while those in arginine still remained at high levels. The percentages of applied-N in theanine N were low in all the tissues at both sampling times (Day 1 and Day 7). The percentages of applied-N in caffeine N in the leaves were much higher than those in theanine, and increased from Day 1 to Day 7. The results obtained suggest the following: (1) N derived from foliar application of urea is assimilated into glutamine first, and then transferred to other amino acids, as well as to caffeine and protein. (2) Arginine is synthesized very actively using urea-N and accumulates in the leaves. (3) Theanine is synthesized with N derived from urea application only to a small extent, probably due to the fact that theanine is synthesized in the roots and that a small amount of foliarly applied-N is transported to the roots in summer.

• 一般社団法人日本土壌肥料学会の論文

著者

• KARASUYAMA Mitsuaki

  Kagoshima Institute of Green Tea Research Laboratories

• Yoneyama Tadakatsu

  National Agricultural Research Center For Tohoku Region

• KOBAYASHI Hironobu

  National Institute of Agricultural Sciences

• Karasuyama M

  Kagoshima Inst. Green Tea Res. Lab. Kagoshima

• Yoneyama Tadakatsu

  National Institute Of Agrobiological Resources

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