以油茶无性系高产品种、中产品种和普通品种为试材,采用LI-6400P便携式光合测定系统在新梢生长期对其净光合速率、蒸腾速率等日变化规律及光合-光响应曲线进行了比较研究。结果表明:3个品种净光合速率日变化曲线存在单峰和双峰两种类型,高产品种与中产品种为单峰型,普通品种为双峰型,普通品种存在明显的光合午休现象,3个品种的净光合速率存在显著差异;3个品种上、下部叶片的蒸腾速率的日变化曲线均为单峰型,水分利用效率的日变化曲线均为"U"型;3个品种的最大净光合速率在8.404 - 10.879 μmol·m-2·s-1之间,光饱和点在305 - 318 μmol·m-2·s-1之间,光补偿点在24 - 53 μmol·m-2·s-1之间;逐步回归分析表明,影响高产品种叶片净光合速率的主导因子为气孔导度、胞间CO2浓度和相对湿度;气孔导度是影响中产品种净光合速率的主导因子,普通品种净光合速率主要受气孔导度和胞间CO2浓度的影响。

应用生长调节剂对板栗处理的结果表明,BA1000ppm促进了结蓬量、出实率及单株产量而抑制了新梢的粗生长和叶片扩大;青霉素150ppm和自配的稀土制剂RS300ppm都能增加出实率,前者能明显促进雌性成花并对抑制新梢伸长生长有一定作用,后者则加速了新梢的粗生长;自配的生长调节剂MN500ppm在雌性成花、结蓬量、出实率和单株产量四个方面具有显著的促进作用,而且无其它方面的不良影响;PP333500ppm在一定程度上能提高结实率并减缓新梢伸长生长,同时也抑制了叶片扩大;GA3200ppm尽管能增加结实率,但主要表现为加速新梢伸长生长,减少结蓬量,抑制雌性成花,降低雌雄比例,显示出雄性化趋势。对内源激素的分析结果也表明,较高浓度的GA3更利于雄花分化及发育。

VC(又名抗坏血酸)对人体的防病抗病作用早已被人们所认识,但迄今对其功能的了解还在不断的深入。大量实验表明,VC作为一种天然抗氧化剂在增强机体免疫功能及在抗逆境、解毒等方面,都显示出其在生物体内的重要作用。VC普遍存在于植物体中,直接参与氧化还原过程[1],逆转胁迫环境对组织的影响[2～4]。曾有人报道过VC含量与水稻抗病性的关系[5]。

Winter lignified stems of B auhinia galpinii were used as exp lants for tissue culture, and the effects ofdifferent hormones on inductivity rate and rooting rate were investigated by supp lementing different concentrations.The results indicated that budswere induced from a 2 cm high young p lantlet cultured inMSmedium supp lementedwith 1. 0 mg·L-1 62BA and 0. 1 mg·L-1 NAA for 20 d, and the induction rate was 100%. The mean amount ofbuds was 8. 7. The medium ofMS + 0. 4mg·L-1 NAA was used for rooting and the rooting rate was 85%. Theexperiment strategy to establish tissue culture system from lignified stem was feasible, which could be used for coldacclimation and cold resistantmutant selection.

以上海市佘山国家森林公园主要森林植被类型的群落学调查资料为基础,通过应用群落相似性和物种多样性测度方法进行计算分析,对该区域的主要森林群落类型、植物多样性特征及其演替趋势进行了分析研究。结果表明:佘山国家森林公园主要由白栎林、毛竹林、香樟林、朴树-榉树林、朴树-刺槐林、梧桐林和枫香-刺槐林等7种森林类型组成; 现有森林植被的植物多样性明显低于邻近的浙江地区,其树种组成也明显偏重于落叶树种,以榆科植物、壳斗科栎类树种为主,而常绿树种则只有香樟、苦槠、毛竹、女贞等少数几个建群种;从森林演替趋势看,未来上海佘山地区的森林主要为三大类:以白栎为主的地带性森林群落,毛竹林和以樟科、榆科、木犀科等科树种组成的常绿、落叶混交林。

The physiological and biochemical responses of Camellia oleifera to low phosphorus stress were investigated in this study, and the different phosphorus concentrations of the treatments were conducted by using a single factor experiment with water culture in the greenhouse. Results showed that the activity of APA in leaves tissues and those secreted by the roots all increased under P deficiency, which respectively increased by 16.49% - 86.47% and 28.7% - 58.7% compared with those of the control. The increase of APA may be an active adaptive response of Camellia oleifera to low phosphorus stress.Under the situation of low phosphorus stress, the concentrations of soluble sugar and free proline increased whereas the soluble protein decreased,those showed that normal protein synthesis and carbohydrate metabolism were blocked under the situation of low phosphorus stress; Moreover, the homeostasis established by the increase of MDA concent and protective enzyme (SOD) activity in leaves was the mechanism of the adaptive response for Camellia oleifera to low phosphorus stress.