In order to study the effect of light quality on the growth, photosynthesis and Taxanes accumulation of Taxus yunnanensis, 2-years old young T. yunnanensis were planted under various color films for 1 year. Their size, biomass, architectural parameters, leaf feature, and photosynthetic parameters such as the maximal net photosynthesis rate (Pmax) , apparent quantum yield (AQY) , dark respiration rate (Rd) , light saturation point (LSP) , light compensation point (LCP) and Taxol content etc. were determined. The results showed that the Pmax, AQY,Rd, LSP, LCP, height, leaf and total biomass of the plants under red films increased. The Pmax, AQY of the plants under yellow films decreased, and the LSP,LCP, leaf, branch, root and total biomass increased- The Pmax and AQY, and ground diameter of the plants under blue films decreased, while the Rd,LSP,LCP and height increased. Under different color films, the diffrence of tananes content in the plants were not significant. The content of baccatin HI in leaf and 7-epi-taxol in root of the plants under red films increased. The content of Taxol, 10-deacetylbaccatin Ⅲ and 7-epi-taxol in root of the plants under yellow f ilms increased. The content of Taxol in root of the plant under blue films increased, but the content of baccatin HI in leaf dicreased.%将2年生云南红豆杉置于用滤光膜营造白光、黄光、红光和蓝光4种光环境中栽培1 a.栽培期间,测定光合作用,试验期末取样测定植株大小、枝叶特性、生物量和紫杉醇含量等,以揭示不同光质对云南红豆杉形态、光合作用和紫杉烷类物质含量的影响.结果表明:红光能提高最大净光合速率(Pmax)、表光量子效率(AQY)、暗呼吸速率(Rd)、光饱和点(LSP)和光补偿点(LCP),抑制叶生长,增加第一级枝枝条总数,促进株高生长,提高茎和植株生物量；黄光使Pmax、AQY降低、使LCP和LSP提高,抑制叶生长,提高茎、叶和植株总生物量；蓝光降低Pmax、AQY,提高LSP、LCP、Rd,抑制叶和地径的生长,促进高的生长.不同光质处理下,根、茎、叶中紫杉烷的含量无显著差异,但是对叶中巴卡亭Ⅲ,根中紫杉醇、10-去乙酰巴卡亭Ⅲ和7-差向紫杉醇含量的影响差异显著.红光显著抑制叶中巴卡亭Ⅲ合成和积累,提高根中7-差向紫杉醇的含量；黄光显著提高了根中紫杉醇、10-去乙酰巴卡亭Ⅲ、7-差向紫杉醇的含量；蓝光显著提高根中紫杉醇的含量,但降低叶中巴卡亭Ⅲ的含量.
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