The elucidation of the autumn leaf phenomenon in deciduous trees.

温度和光照强度影响蓝莓叶片花色苷的合成。蓝莓叶中的花青素苷元几乎都是花青素。结果表明，叶花青苷合成的调控系统与果实花青苷合成的调控系统不同。通过cDNA差减法和简并PCR法分离得到9个花色苷合成相关基因。在24小时的强辐射下，许多花色素苷合成基因表达。花青苷合成系统可能在光胁迫下起保护作用。

The temperatures and the intensities at the light irradiationinfluenced the synthesis of the anthocyanins in the blueberry leaves. The anthocyaninaglycones in the blueberry leaves were almost the cyanidin. The results suggest that theanthocyanin synthesis control system of the leaves is different from the system of the fruits. The nine anthocyanin synthesis rerated-genes were isolated by the cDNA subtraction orthe degenerated PCR. The many anthocyanin synthesis genes were expressed by thestrong irradiation within 24 hours. The anthocyanin synthesis system may responsequickly to protect from the light stresses.