肉桂粉实病菌两型孢子的研究

肉桂粉实病病原菌的无性阶段是病菌生命的基础,通过室内外的调查研究发现,肉桂粉实病的病原菌是花生油盘孢菌[ElaeodemafloricolaKeis],该病菌的无性阶段,除有隔菌丝外,有两型孢子。孢子适宜温度24℃左右,相对湿度98%以上,节孢子形成先于分生孢子。所有孢子都能致病,引起病害多次而集中,造成肉桂生产巨大损失。     

桂红4号等无性系茶树品种开发六堡茶工艺

以广西桂林茶叶科学研究所自主知识产权的桂红3号、桂红4号、桂绿1号3个无性系国家级红、绿茶品种为材料,以氧化基质含量丰富的云南大叶种为对照,进行发酵六堡茶研究,开发出无性系品种桂绿1号和桂红3号较好的发酵工艺为工艺一,桂红4号的发酵工艺为工艺一和工艺二;并制定相应的技术参数,为六堡茶开辟了新的无性系茶树品种原料。     

民勤沙拐枣克隆种群构件结构及与环境因子的灰色关联分析

引入"构件"一词来表述植物体的不同组分,并在此基础上将其进一步发展为种群构件理论,极大地推动了植物种群生态学的发展(Bazzaz et al.,1978;Halle et al.,1978;Harper,1977;1980;钟章成,1992)。对木本植物而言,其地上部分枝或茎的顶端分生组织和侧生分生组织通过不断重复的、持续的活动产生新的分枝,构成了复杂的枝系构件和多样的外部形态特征。克隆种群对环境因子的反应首先表现在种群个体的构件结构上,对克隆植物构件的统计研究可涉及个体(基株)、分株和枝系3个水平(董鸣,1997),从构件间及其与环境因子的相     

The genetic variation of inter‐provenance hybrids of picea abies and possible breeding consequences

The variance of general combining ability (GCA) and specific combining ability (SCA) for height and diameter growth were estimated from a 13 years old provenance hybridization study in Norway spruce. The GCA variance component for both height and diameter growth was significant, but there was no significant SCA variance. Hybrid progenies outperformed the progenies from stands, but this superiority was not interpreted as a provenance heterosis effect. Estimated family heritabilities for height and diameter growth were moderately high (0.40 for both traits). A consequence of the low SCA variance for Norway spruce may be that clonal testing should replace progeny testing for estimating GCA.     

若干无性系良种径山茶的品质特征研究

本研究以鸠坑群体种为对照,用感官审评与生化呈味成分分析相结合的方法,对乌牛早、浙农139、龙井长叶、茂绿、白茶等5只无性系茶树良种所制径山茶的品质特征开展了研究。研究结果表明,综合品质排序前三位的均为无性系茶树良种,依次为浙农139、茂绿、龙井长叶,说明科学推广无性系茶树良种仍是提升径山茶品质的有效途径。     

Adventitious rooting in shoot cuttings of Azadirachta indica and Pongamia pinnata

Adventitious rooting in shoot cuttings of neem (Azadirachta indica) and karanj (Pongamia pinnata) was investigated in different seasons. The influence of auxins and B-vitamins (neem only) was evaluated. Maximum rhizogenesis coincided with the emergence of new sprouts i.e. February (neem) and March (karanj). Considering both rooting percentage and root biomass, IBA was the most effective auxin tested. Compared to auxin free controls, IBA (1000 ppm in neem and 800 ppm in karanj) significantly increased adventitious rooting percentage (80 to 100 % respectively), the numbers of roots and root biomass for both species. In neem, B-vitamin treatment yielded 40–50% rooting for cuttings. This was significantly greater than rooting for controls but equivalent to IAA treatments. In neem, some of the cuttings treated with 2000–3000 ppm IBA had well developed root systems without any sprouts. In karanj, all auxin treatments promoted sprouting. The level of total soluble sugars in the rooting zone of neem and karanj was higher in non-rooted than rooted cuttings.     

Black locust (Robinia pseudoacada L.) clonal seed orchards in Hungary

Black locust (Robinia pseudoacacia L.) is one of the most important stand-forming tree species in Hungary and its importance is increasing in many countries. The main aim of the discussed new selection programme is to identify black locust clones with good performance and good form for setting up clonal seed orchards. As a result of selection programme 16 new black locust clones have been improved. In spring 2002 a black locust seed orchard was established with the newly selected clones. About 40% of the plants can be considered to belong to the height growth rate class 1 and 2. Hungary was the first country where micropropagated black locust planting material was used for seed orchard establishment.     

克隆植物中国沙棘种群稳定性维持途径的探讨

中国沙棘属于阳性树种,因此有些学者将其视为群落演替过程中的先锋种群,而有些学者的研究表明它在自然状态下更新良好。近年来的研究进一步证明,中国沙棘能够依靠克隆生长所赋予生理整合和觅养行为等特性提高环境资源的利用效率以及自身的繁殖和生存有效性,通过林窗更新和林缘扩散等途径维持种群的稳定性和持久性。     

巨桉无性系生长早期选择

对26个巨桉无性系人工林生长性状的调查分析表明：胸径、材积在无性系间呈极显著差异,相关性分析结果表明胸径、树高、材积三者间存在极显著的正相关关系。变异系数最大的是材积,达到78.82%,其次为树高和胸径,分别为52.23%、23.13%。胸径、树高、材积的重复力分别为0.5744、0.5469、0.3453。利用综合评定方法评选出5个优良的巨桉无性系,分别为20、18、25、9和5号。5个优良无性系胸径、树高、材积的遗传增益分别为11.60%、11.09%和2.05%。