Effect of girdling on translocation of <sup>14</sup>C-photosynthetic product and photosynthetic rate in mulberry

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  • 桑枝条の環状はく皮処理が｀１４´Ｃ‐光合成産物の転流と光合成速度におよぼす影響
  • 桑枝条の環状はく皮処理が14C‐光合成産物の転流と光合成速度におよぼす影響
  • ソウシジョウ ノ カンジョウ ハク ヒショリ ガ 14C コウゴウセイ サンブ

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The effect of girdling on translocation of 14C-photosynthetic product was examined using mulberry shoots in which the operation of ringbarking was done to the internodes just above and just below the leaf from which labelled CO2 was administered. The effect of girdling on the photosynthetic rate of the leaf was also examined. Translocation of 14C to the stump and roots, downward translocation, was inhibited almost completely by the girdling. Upward translocation was also inhibited severely, and a small amount of 14C translocated to the shoot tip. With passing the time after girdling, photosynthetic rate of the leaf decreased and the areal weight of that increased. When girdling was given only to the portion just above or just below the leaf, photosynthetic rate also decreased, but the rate was higher in comparison to the case where the operation was given to both portions. The relationship between photosynthetic rate and accumulation of 14C-photosynthetic product in leaf was discussed.

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