不同基质对越南抱茎茶容器苗生长的影响

研究不同栽培基质对越南抱茎茶生长的影响,结果表明:基质4作用下的越南抱茎茶的地径、苗高、叶数等生长状况表现最好,其次为基质3和基质2;不同配比栽培基质作用下,基质4能显著促进苗木高生长,其次是基质3和基质2.不同基质配比对苗木叶量的生长差异影响不显著.综上所述,基质4(V河沙∶V椰糠=2∶1)基质配比较适合越南抱茎茶的生长,其次为基质3(V赤红壤∶ V椰糠∶ V泥炭土=5∶4∶1)和基质2(V赤红壤∶V泥炭土=2∶1).     

越南抱茎茶油脂主要脂肪酸组分测定

为了开发越南抱茎茶(Camellia amplexicaulis)资源,运用GC-MS对其油脂主要脂肪酸组成进行分析,并与普通油茶(C.oleifera)进行比较。结果表明,越南抱茎茶油脂中,饱和酸的含量较高,与不饱和酸的比例接近1∶1,棕榈酸达到43.81%～45.23%,与普通油茶油脂差异较大。在油茶籽油生产中,不能将两者混在一起,以免影响油茶籽油的品质。     

3种山茶属植物花粉活力测定方法的比较

采用I-IK法、过氧化物酶法和TTC法对张氏红山茶、越南抱茎、南山茶新鲜花粉的活力进行了测定。3种方法测定的结果表明:3种花粉活力都在92.00%以上,南山茶的花粉活力最高,在90.20%~100.00%,越南抱茎茶次之在80.80%~99.40%,张氏红山茶在84.80%~96.00%。3种方法所测花粉活力存在显著差异或极显著差异。I-IK染色法所测花粉活力高于过氧化物酶法和TTC法所测花粉活力,此法染色快,并且染色清晰,可用于山茶花粉活力的快速测定;过氧化物酶法次之,TTC法所测花粉活力最小,这2种方法,染色需时长,而且染色不清晰,不适于快速测定山茶花花粉活力。     

大果石笔木引种栽培研究

【目的】在柳州市引种种植大果石笔木,观察其对环境的适应性,为大果石笔木应用于园林绿化提供科学依据。【方法】在柳州市设点对大果石笔木进行物候期观察、种子繁殖、生长量测定及不同地点栽培试验。【结果】在柳州市气候环境条件下,大果石笔木种子繁殖发芽率达84.75%,年高生长达100.0cm以上,年茎粗生长达1.00cm以上;不同地点栽培的大果石笔木物候期基本一致,植株个体生长正常,树形丰满茂盛,均表现出较强的抗寒、抗旱、抗高温、抗病虫害能力,但耐涝能力较弱。【结论】大果石笔木适应柳州市自然气候环境条件,可作为乡土树种在柳州市城市园林绿化中推广应用。     

基于层次分析法的4种山茶科植物观赏价值评价*

应用层次分析法,对猪血木（Euryodendron excelsum）、杜鹃红山茶（Camellia changii）、越南抱茎茶（C. amplexicaulis）、石笔木（Tutcheria championi）4种山茶科植物的树形、花、叶和果进行观赏价值综合评价,结果显示：在树形、花、叶、果4个影响因子中,花因子最能影响人对植物的评判,其次是树形、叶,最后是果;4种植物中,最佳观树形植物是猪血木,最佳观叶、观花植物是杜鹃红山茶,最佳观果植物是石笔木。4种植物的综合观赏价值从高到低依次为杜鹃红山茶>越南抱茎茶>猪血木>石笔木。     

Systemically released volatiles from Solena amplexicaulis plant leaves with color cues influencing attraction of a generalist insect herbivore

Solena amplexicaulis (Lam.) Gandhi (Cucurbitaceae) is a promising vegetable in Southeast Asia. Infestation of Aulacophora foveicollis Lucas (Coleoptera: Chrysomelidae) adults on leaves of the crop plant causes death of the plant and reduces crop production. Currently, growers are applying insecticides to control this pest, which are harmful to health and environment. Hence, an attempt has been made to find out allelochemicals from leaves attracting the insect, which might be used for ecofriendly pest management program. The emission of volatiles was detected from undamaged leaves of herbivore-induced plants after 24 h and 120 h of continuous females feeding on lower leaves of the same plants by GC-MS and GC-FID analysis. The insect showed attraction to systemically released volatiles from herbivore-induced plants against unharmed plants in Y-shaped glass tube olfactometer bioassays. The insect was attracted to a synthetic blend of 1.2 µg linalool oxide + 3.2 µg nonanal + 1.5 µg trans-2-nonenal dissolved in 20 µL CH₂Cl₂ in olfactometer and wind tunnel bioassays, and hence, this blend could be used in development of baited traps in pest management strategies.     

Cytoplasmic male sterility in Nicotiana tabacum L. obtained through interspecific hybridization

Three new sources of cytoplasmic male sterility in tobacco with interspecific origin are reported. The wild species Nicotiana excelcior Black (n = 19), N. amplexicaulis Burbidge (n = 18) and N. rustica L. (n = 24) are used as donor of cytoplasm. Nuclear donor is N. tabacum L. (n = 24). The genetic effects of cytoplasmic-nuclear interactions of the studied species are discussed. Our experiments prove that N. excelcior, N. amplexicaulis and N. rustica are carriers of cytoplasmic genes for male sterility that express in combination with nuclear genes of N. tabacum. This revised version was published online in July 2006 with corrections to the Cover Date.     

越南抱茎茶光合特性研究

用LI-6400型便携式光合作用测定系统对越南抱茎茶Camellia amplexicaulis光合特性进行了研究。结果表明:越南抱茎茶净光合速率日变化呈单峰型曲线,峰值出现在上午11:00左右,为20.34umol·m-2·s-1;通过光响应曲线拟合得知其光补偿点为4 umol·m-2·s-1,光饱和点为600 umol·m-2·s-1。多元线性回归分析表明:越南抱茎茶净光合速率与光强、水分利用效率、蒸腾速率和细胞间CO2浓度之间具有极显著正相关性(P≤0.01),相关系数分别为:0.979、0.987、0.998、0.999。此外,其与大气温度之间具有显著正相关性(0.01≤P≤0.05),相关系数:0.999。