Effects of shading on the respiration metabolism of cherry buds in dormant period
遮荫对休眠期大樱桃芽呼吸代谢的影响研究

The effects of shading on the respiration metabolism o f 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 flowere d 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 resp ir atory intensities rapidly decline and after that they change little. In the late dormant period the respiratory intensities slowly rise.Under the nature condi tion three respiratory pathways show different changes: EMP reduces and TCA alwa ys 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 study of seed. Effects of shading on the respiratory intensities of flower buds and leaf buds a re consistent:before October 24,they rapidly reduce and then change little.Flowe r buds reduce more rapidly than leaf buds and different shadings affect it bigge r 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 r ise. The slowdown of EMP and the increase -rang e of PPP of two -layer shading are bi gger than those of one -layer shading. The shad ing makes the PPP continuously enhanced, indicating that shading through PPP may promote the release of bud dormancy.