Effects of shading on the respiration metabolism of cherry buds in dormant period

The effects of shading on the respiration metabolism of flower buds and leaf buds of cherry in dormant period were studied. The results show that in early dormant period the respiratory intensities of cherry flowered buds and leaf buds are relatively infirm and reduce slowly and the slowdown of leaf buds is lower than that of flower buds. At the lower temperature the respiratory intensities rapidly decline and after that they change little. In the late dormant period the respiratory intensities slowly rise.Under the nature condition three respiratory pathways show different changes: EMP reduces and TCA always fluctuates at about 48 percent,but PPP markedly rises. This shows that PPP may be the main reason of dormant relieve,this is in accord with the tudy of seed. Effects of shading on the respiratory intensities of flower buds and leaf buds are consistent:before October 24,they rapidly reduce and then change little.Flower buds reduce more rapidly than leaf buds and different shadings affect it bigger than the latter.Effects of shading on the respiratory pathways of flower buds are similar to those of leaf buds,the shading makes EMP reduce but TCA and PPP rise. The slowdown of EMP and the increase-range of PPP of two-layer shading are bigger than those of one-layer shading. The shading makes the PPP ontinuously enhanced, indicating that shading through PPP may promote the release of bud dormancy.