Litter production, decomposition and nutrient mineralization dynamics of Ochlandra setigera: A rare bamboo species of Nilgiri Biosphere Reserve, India

Litter production, decomposition and nutrient release dynam-ics of Ochlandra setigera, a rare endemic bamboo species of Nilgiri biosphere were studied during 2011-2012 using the standard litter bag technique. Annual litter production was 1.981 t？ha-1 and was continuous throughout the year with monthly variations. Litterfall followed a tri-phasic pattern with two major peaks in November, 2011 and January, 2012 and a minor peak in July, 2011. The rate of decomposition in O. setigera was a good fit to the exponential decay model of Olson （1963）. Litter quality and climatic conditions of the study site （maximum tem-perature, monthly rainfall and relative humidity） influenced the rate of decomposition. Nutrient release from the decomposing litter mass was in rank order N=Mg＆gt;K=Ca＆gt;P. Nutrient release from litter was con-tinuous and it was in synchrony with growth of new culms. Study of litter dynamics is needed before introduction of a bamboo species into degraded or marginal lands or Agroforestry systems.

短穗鱼尾葵及长穗鱼尾葵花粉过敏原的分析、鉴定与纯化

目的对长穗鱼尾葵和短穗鱼尾葵花粉变应原蛋白进行分析、鉴定与纯化。方法提取这两种花粉的粗提液,通过十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)分离粗提液蛋白质组分并测定其分子量。收集过敏病人血清,采用免疫印迹(Western-blotting)法鉴定其变应原成分,通过离子交换层析对花粉变应原进行初步纯化和免疫印迹鉴定。结果长穗鱼尾葵花粉有30余条蛋白带,其中主要条带有18条,12000和14000 Mr为长穗鱼尾葵花粉特异性变应原;短穗鱼尾葵花粉有30余条蛋白带,其中主要条带有9条,26000、12000和14000 Mr为短穗鱼尾葵花粉特异性变应原,其中14000 Mr为主要变应原;通过离子交换层析方法纯化出长穗鱼尾葵花粉相对分子质量为12000和14000的变应原主要分布在Ⅱ峰中,短穗鱼尾葵花粉相对分子质量为14000的主要变应原分布在Ⅴ峰和Ⅵ峰中。结论对长穗和短穗鱼尾葵花粉变应原进行了初步的分离、鉴定和纯化,为临床鱼尾葵花粉变态反应疾病的诊断和治疗奠定了基础。

鱼尾葵营养成分测定

对野生植物鱼尾葵的营养成分进行了分析测定,结果表明,鱼尾葵中含有多种营养成分,丰富的矿质元素、维生素及β-胡萝卜素。鱼尾葵中至少含有17种氨基酸。旨在为开发利用植物资源提供科学依据。

鱼尾葵叶斑病病原菌的基础生物学特性

对鱼尾葵叶斑病病原（Coniothyrium palmarun Corda）进行基础生物学特性研究。结果表明：致病菌CW6对发病有明显影响 CW6为棕榈盾壳霉（C.palmarun Corda） 该菌生长温度为10-35℃,最适温度为28℃ 生长的适宜pH值为5 光照对菌丝生长无显著影响 菌丝生长最佳碳源为L-果糖,最佳氮源为L-脯氨酸 致死温度为40℃。