共查询到20条相似文献,搜索用时 203 毫秒
1.
2.
在黑龙江绥棱和内蒙古磴口试验区对俄罗斯11个大果沙棘品种和蒙古1个大果沙棘品种的种子特性进行了探讨,结果如下:(1)中国沙棘种子千粒质量、种子特征值明显低于引进大果沙棘品种.绥棱试验点供试的11个引进品种千粒质量及种子特征值均比磴口试验点高;根据种子长宽比及形状,对中国沙棘与大果沙棘进行了初步的划分.(2)大部分品种种子的宽度及长度在遗传和对环境适应上具有紧密相关性,种子厚度的遗传比较稳定,对环境的变化不敏感.(3)种子特征指标,如种子长度、宽度、长宽比3个指标与千粒质量呈极显著相关,特别是种子长度;千粒质量与百果质量呈现极显著线性相关.(4)发芽初期,中国沙棘的发芽率较引进品种高;发芽第14天时,所有供试品种的发芽率均达到了最大,发芽率高的品种有乌兰格木、丰产、巨人、绥棘1号、卡图尼礼品,发芽率≥67%.(5)不同大果沙棘种子的总黄酮、维生素E含量均具明显差异;引进品种的饱和脂肪酸显著高于中国沙棘;不同大果沙棘品种的饱和脂肪酸差异明显. 相似文献
3.
通过对千年桐(Aleurites montana)5个无性自然授粉观察,并开展无性系控制授粉试验,初步了解无性系的自然坐果率和人工控制授粉技术。初步试验结果如下:5个无性在自然授粉条件下坐果率变化范围在57.79%~86.49%,坐果率最低的无性系为天雹2号,坐果率最高的为武宣3号,而在落果率武宣2号最高,为28.89%,桂皱27号最低,为14.67%;采用不同雄株的花粉进行人工授粉,坐果率也存在差异,桂皱27号×Ⅲ号雄株、武宣2号×Ⅳ号雄株、武宣3号×Ⅲ号雄株、天雹2号×Ⅲ号雄株和吴圩4号×Ⅳ号雄株等组合的坐果率较高;通过分析杂交果实的经济性状,筛选出的优良杂交组合是桂皱27号×Ⅲ雄株、武宣2号×Ⅱ雄株、天雹2号×Ⅲ号雄株和吴圩4号×Ⅰ号雄株。 相似文献
4.
在西宁地区采用裂区设计将不同品种沙棘种植于不同种肥用量下进行实验结果表明:中华沙棘在其株高、根长、根茎、干重四项指标的测定中均高于向阳、楚伊两个大果沙棘品种。在300 kg/hm^2的施肥水平下,大果沙棘的苗期株高、根长、根茎、干重生长量最大。品种和不同磷酸二氨的施肥量的互作显著,中华沙棘在低肥条件下的生长量大,在高肥条件下向阳、楚伊的生长量大。 相似文献
5.
6.
选择综合性状优良的栽培品种 ,按 8∶1或 10∶1的比例配置优良的授粉雄株 ,采用 3m× 2m或 4m× 2m行株距精细栽植 ,在隔年施入基肥的基础上 ,每年追施 2~ 3次 ,在干旱年份每年浇水 3~ 4次 ,合理整形修剪 ,及时防治病虫害。以上是良种沙棘种植园丰产栽培的几项主要技术措施 相似文献
7.
8.
在西宁地区采用复因子设计,将不同品种沙棘种植于不同种肥用量下进行试验,结果表明,在一般肥力条件下,楚伊大果沙棘在其株高、地径等生长指标的测定中均高于中华、向阳品种。在300kg/hm^2。的施肥水平下,大果沙棘的苗期株高生长量最大;品种和磷酸二铵的不同施肥量互作极显著;楚伊沙棘在低肥条件下生长量大,向阳和中华在高肥条件下生长量大。 相似文献
9.
在黑龙江绥棱和内蒙古磴口试验区对13个大果沙棘品种的生长性状及其与产量的相关关系进行了研究,结果表明:(1)大果沙棘的叶片长度在不同试验点间差异不明显,磴口试验点的叶片宽度不同程度地比绥棱试验点小,同一试验点不同品种的叶片长度与宽度亦存在一定差异;中国沙棘叶片长度明显小于引进大果沙棘品种,宽度与引进品种相近;磴口试验点叶片长宽比明显高于绥棱,叶片长宽比的大小可作为衡量品种抗逆性或者适应性的一个指标.(2)不同大果沙棘品种的枝刺数具有很大的不同,且同一品种在不同试验点的枝刺数并不完全一致,在磴口试验点,许多品种的枝刺数有明显的增加趋势,这可能是对干旱环境的一种适应或反应;中国沙棘枝刺数量多,为长期适应干旱瘠薄环境的结果.(3)大多数大果沙棘品种在磴口试验点的株高、地径及冠径均低于绥棱试验点,中国沙棘生长旺盛,其株高、地径及冠径均明显大于大果沙棘.(4)品种不同丰产性也不同,而且产量的年度稳定性相差很大,在试验林进入盛果期后,一些大果沙棘品种产量可达到10000kg·hm-2.(5)不同试验点不同品种的生长指标与产量的线性相关性强弱不一致;从生长指标的大小可对产量进行有效预测,而准确的预测还需要进行连续的生长观测和产量测定,以建立完善的沙棘产量预测体系. 相似文献
10.
11.
12.
根据南方的气候特点,对不同地区的不同环境和植物种类组织,在全省14个市(州)开展了新剂型的应用研究。试验结果表明:绿色植物生长调节剂比原ABT生根粉1~5号使用简便,效果更好。可大力应用。 相似文献
13.
14.
Exposure to standard solution S extract ofPunica granatum, Thymus vulgaris andArtemisia absinthium for 72 h reduced the numbers of active nematodes by 100% forMeloidogyne incognita and by 95.7%, 71.4% and 42.9% forHelicotylenchus dihystera, respectively. Exposure to S/2 dilutions for 72 h reduced nematode motility by 100%, 77.3 and 72.7% forM. incognita, and by 92.9%, 37,1%, and 37,1% forH. dihystera, respectively. As exposure to S and S/2 extracts ofCitrullus colosynthis andRicinus communis reduced nematode motility by less than 32% forM. incognita and by less than 30% forH. dihystera. WhenM. incognita andH. dihystera were transfered to water for 72h, more than 85% of the individuals resumed normal movement at all extract dilutions except S ofA. absinthium andT. vulgaris and S and S/2 ofP. granatum. However, recovery ofM. incognita was more less than that ofH. dihystera. Exposure to S extracts ofP. granatum andT. vulgaris for 30 days reduced egg-hatching ofM. incognita by 100% and by 98.7% for S/2 dilutions. Also, 98.7% reduction in the egg-hatching was obtained by S ofA. absinthium. Extracts ofC. colosynthsis andR. communis gave less egg-hatching inhibition. Acetylcholinesterase (AChE) activity was suppressed by more than 75% inH. dihystera treated with S of each ofP. granatum, T. vulgaris andA. absinthium. However, the former extract gave the highest AChE inhibition (98.7%). When nematodes were treated with oxamyl (Vydate 24%), AChE activity was suppressed by 53.3%. The other extract dilutions suppressed AChE activity by less than 50%. 相似文献
15.
16.
18.
植物促生根圈细菌诱导植物系统抗性的研究进展 总被引:2,自引:0,他引:2
该文简要回顾了植物根圈促生细菌(PGPR)能够诱导植物系统抗病性(ISR)这一领域的研究历史,对ISR作用机理、研究法则、研究内容及其它相关问题进行了总结探讨,并展望其未来的研究方向。 相似文献
19.
The transfer mechanisms, calculating methods and ecological significance of nitrogen transfer between legumes and non-legumes
are briefly reviewed. There are three pathways of nitrogen transfer from legumes to neighboring non-legumes: (1) the nitrogen
pass in soluble form from the donor legume root into the soil solution, move by diffusion or/and mass flow to the receiver
root and be taken up by the latter; (2) nitrogen pass into the soil solution as before, be taken up and transported by mycorrhizal
hyphae attached to the receiver roots; (3) if mycorrhizal hyphae form connections (bridges) between the two root systems,
the nitrogen could pass into the fungus within the donor root and be transported into the receiver root without ever being
in the soil solution. The mechanisms of nitrogen transfer between N2-fixing plants and non-N2-fixing plants are reviewed in terms of indirect and direct pathways. The indirect N-transfer process is related to the release
of nitrogen from legumes (donor plants), the possible interaction of this nitrogen with soil, the decomposition and mineralization
of legumes and turnover of nitrogen, the nitrogen absorbing and competing abilities of the legume and the non-legume (receiver
plant). The direct nitrogen transfer process is generally considered to be related to the nitrogen gradient and physiological
imbalance between legumes and non-legumes, and when the donor legume lies in stressful stage (i.e. removal of shoots or attacked
by insects), the nitrogen transfer can be improved significantly. The methods of determining nitrogen transfer (indirect15N-isotope dilution method and direct15N determination method) are evaluated, and their advantages and shortcomings are shown in this review.
Foundation Item: This paper was funded by National Science Foundation and Doctor Foundation of China.
Biography: J{upang} San-na (1970-), male. Ph. doctor, engineer in Collage of Resource and Environment. Beijing Forestry University
Responsible editor: Chai Ruihai 相似文献
20.
IntroductionNitrogenisanelementthatcyclesthroughanecosyst6mandneedstobepresentatacertain'minimumIeveItosust8inthatsystem.lnaninterspe-ciesconteXt,thebeneficiaIeff6ctsofN2-fixingpIantsinecosyst6ms,duetOtheirc0ntributionofnitr0gen,havebeenobservedbysucceedinggenerationsofagronomists,f0rest6rs,andecoIogists.Thein-terpIantsofN2-fixingplantsandnon-N2-fixingplantsarepraCticedtoincreasetotaIyieldandreducetheneedfOrf6Ftilizersinput,andithasbeenshownthatpartoftheassimiIatedNinthenon-N2-fixingpIa… 相似文献