7 种箬竹抗寒特性比较

为探明7 种箬竹Indocalamus spp .的抗寒特性, 利用叶绿素荧光技术测定了夜间低温胁迫后7 种箬竹叶绿素荧光参数的日变化。结果表明:各种箬竹PS Ⅱ实际光化学量子产量日变化规律呈近似W 型;广东箬竹Indocalamus guangdongensis PS Ⅱ光化学效率(Fv/ Fm),PS Ⅱ潜在活性(Fv /Fo )和PS Ⅱ实际光化学量子产量等参数值均低于其他箬竹种;小叶箬竹I .pumilus 具有最高的初始荧光(F o )和最大荧光(Fm )值;髯毛箬竹I .barbatus 的Fv /Fm ,Fv /Fo 值均高于其他几种箬竹, 说明广东箬竹最容易遭受低温胁迫, 抗寒性差, 而小叶箬竹和髯毛箬竹抵抗低温能力较强。可见, 利用叶绿素荧光分析技术来鉴别箬竹种间抗寒性是可行的。图4 表3 参15

Comparative study of cold resistance characteristics in seven Indocalamus spp .

Diurnal changes of a chlorophyll fluorescence with low temperature stress at night were studied using the chlorophyll fluorescence technique to determine cold resistance in seven Indocalamus spp .Results indicated that diurnal changes of the actual photochemistry quantum yield for PS Ⅱ was approximately W-shaped .Also , parameters , such as the photochemistry efficiency of PS Ⅱ (Fv / Fm), latent activeness of PS Ⅱ (Fv /Fo ), and Yield of I .guangdongensis , were lower than other Indocalamus spp .I .pumilus had the largest initial fluorescence (F o)and fluorescence (Fm)with Fv / Fm and Fv / F o of I .barbatus being higher than several other Indocalamus spp .This indicated that I .guangdongensis more readily suffered from low temperature stress and therefore had weak cold resistance .However , the cold resistance of I .pumilus and I .barbatus was comparatively stronger .Thus , it is feasible to test cold resistance of different Indocalamus spp .with the chlorophyll fluorescence analysis technique .[ Ch , 4 fig .3 tab .15 ref .]