排序方式： 共有11条查询结果，搜索用时 15 毫秒
1.
在罂粟果实膨大期,对正茬、迎茬、连作2 a、连作4 a处理的叶片光合生理生态参数进行了测定,旨在研究连作对罂粟光合作用的影响。结果表明:罂粟正茬、迎茬、连作2 a处理的光合速率日变化呈双峰曲线,具有明显的"午休"现象;连作4 a处理的光合速率变化呈单峰曲线.正茬、迎茬和连作4 a处理的光合速率下降(午休)是由气孔因素引起的,而连作2 a处理的光合速率下降(午休)主要原因是由非气孔因素引起的.正茬处理的光合速率显著高于迎茬、连作2 a和连作4 a处理的光合速率,分别高出2.71、2.28、2.31μmol/(m2.s). 相似文献
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Downy mildew (DM) caused by Peronospora arborescens is the most destructive disease of opium poppy which assumes considerable importance in India and other poppy growing countries.
The present study was aimed at identification and evaluation of stable resistance sources of DM in opium poppy. Furthermore,
genetic variability and inheritance pattern of DM resistance has also been studied which can help in making strategy for crop
improvement. Evaluation of 35 selected germplasm accessions of opium poppy under glasshouse and field conditions during the
three consecutive years (2004–2005 to 2006–2007) resulted in identification of two genotypes (I-14 and Pps-1) as highly resistant
and stable sources for DM resistance. Genetic studies of DM resistance revealed polygenic control with the dominance of susceptibility
over resistance. Significant reciprocal differences were found largely due to maternal transmission of DM resistance indicating
the involvement of cytoplasmic genes in addition to nuclear control. Analysis of genetic variability and selection parameters
indicated predominance of additive effects for DM resistance and other yield contributing traits. Multivariate analysis resulted
in classification of 35 selected accessions into 11 different clusters revealing very high level of diversity among the genotypes.
Cluster analysis suggested that hybridization program involving genotypes from cluster V (which included highly resistant
genotypes Pps-1 and I-14) and cluster IX (which included highly susceptible Jawahar-16 having good economically important
traits like seed yield) could be expected to give best recombinants for improvement in terms of DM resistance and high seed
and straw yield in opium poppy. Analysis of selection parameters like heritability and genetic advance also suggested that
simple selection methods will be effective in stabilizing resistance traits following hybridization with high yielding genotypes. 相似文献
3.
Kun Jia Bingfang Wu Yichen TianQiangzi Li Xin Du 《Computers and Electronics in Agriculture》2011,75(2):272-277
Opium is a narcotic obtained from opium poppy and raw materials of heroin for illegal drug trade. Information on opium production is important for governments and international communities to understand the scale of illegal drug trade and to implement drug fighting policies. Opium production can be estimated from opium yield and poppy cultivation acreage. Poppy cultivation acreage in turn can be estimated using remote sensing technique. This study explores the feasibility of assessing opium yield using remote sensing technique. The objective of this study is to find an effective biophysical indicator that can be related to both opium yield estimation and remote sensing measurements. Data are obtained from three years ground experiments conducted in an official farm in North-Western China. Opium yield and main plant and environmental parameters of opium poppy are measured. A linear regression analysis measures the relationship between opium yield and main plant parameters. A strong correlation between opium yield and leaf area index (LAI) in flowering and harvesting periods of opium poppy is observed (R2 = 0.826 and 0.862 respectively). LAI is a good indicator during flowering and harvesting periods and can be used to build a model for opium yield estimation. Furthermore, LAI can be retrieved using remote sensing at a region scale. The study shows that remote sensing could be used to estimate opium yield in opium poppy concentrated regions, and that a more comprehensive and precise opium production information could be obtained for further analysis of illegal drug circulating trend and policy. 相似文献
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蒋廷黻的琦善研究以中外档案为依据,填补了中国近代外交史研究的空白,并且成为了这一研究领域的新标准。他对琦善的一些论断即便在今天的研究水平下也是不能被推翻的。时人对他做翻案文章的理解与他的真实意图存在着差距。他的目的在于为中国抵抗帝国主义侵略找一条切实可行的道路,即运用外交手段求得和平,以现代化的方法来与帝国主义相抗衡。 相似文献
6.
Sudhir Shukla S. P. Singh H. K. Yadav A. Chatterjee 《Genetic Resources and Crop Evolution》2006,53(3):533-540
The opium latex of 1470 individual plant samples of 98 germplasm lines were screened for five major economic alkaloids. The
alkaloids profile showed that morphine content ranged from 9.20–20.86% with an average of 15.00 ± 0.267. Codeine ranged from
1.69–6.48% with arithmetic mean of 3.35 ± 0.091, thebaine from 0.52–7.95% with an average of 2.27 ± 0.116. Narcotine ranged
from 8.79–17.97% with an average 8.79 ± 0.266 and papaverine content ranged from 0.00–6.07% with an average 1.18 ± 0.167 in
over all the germplasm lines. The content of different alkaloids categorized into class interval which exhibited that maximum
number of plants and accessions for morphine content fall in group of 10–15% followed by 15–20%, for codeine content in group
of 2–4% followed by 4–6%, for thebaine content in 1–2% followed by 2–4%, for narcotine in 5–10% followed by 10–15% and for
papaverine content 0–2%. 24 germplasm lines had morphine content above 16.0%. Similarly, 37 germplasm lines for codeine and
13 for thebaine showed consistently high content, i.e., above 3%. 33 germplasm lines had narcotine content above 9% and 20
lines exhibited papaverine content above 2%. Line BR 316 was found unique having thebaine content 6.27–9.33%. The probable
reasons of increase or decrease of different alkaloids based on their biosynthetic pathway has been discussed in detail. 相似文献
7.
Seema Prajapati Suphla Bajpai Digvijay Singh Rajesh Luthra Madan M. Gupta Sushil Kumar 《Genetic Resources and Crop Evolution》2002,49(2):183-188
The capsule husks of a set of 115 Indian land races of opium poppy Papaver somniferum L. obtained over two cropping seasons were screened for the percent contents of papaverine, reticuline, narcotine, thebaine, codeinone, codeine,morphine and oripavine. Among the accessions screened 36, 7 and 1 didnot accumulate papaverine, papaverine and narcotine and codeine and morphine, respectively. The alkaloid profiles and correlations between alkaloids in all the four classes of accessions showed thatin the Indian genetic resources of P.somniferum (a) morphine is synthesized from codeine rather than oripavine, (b) net alkaloid contents are low under narcotine deficiency, and (c)accumulation of morphine and codeine was limited upstream of codeine and morphine. The accessions identified to be harboring genetic blocks in the phenenthrine and benzylisoquinolinebiosynthetic pathways will be useful for understanding the genetic control of secondary metabolism in opium poppy. 相似文献
8.
花蕾期喷施克阔乐对罂粟光合特性的影响 总被引：1，自引：0，他引：1
试验初步研究了克阔乐用于防除罂粟的效果。采用随机完全区组设计,在罂粟花蕾期喷施24%的克阔乐,研究其对罂粟叶片光合特性(photosynthesisi traits)、叶绿素含量(chlorophyll content)、相对含水量(relative water con-tent)、细胞质膜相对透性(plasma membrane permeability)和脯氨酸含量(proline content)的影响。结果表明:随处理浓度的增加,光合速率(Pn)、蒸腾速率(Tr)气孔导度(Gs)、细胞相对含水量(RWC)和叶绿素含量(CCI)均有不同程度的降低,而胞间CO2浓度(Ci)、脯氨酸含量(PC)和相对透性表现为升高的趋势。其中0.5 mL.L-1、1.0 mL.L-1和2.0 mL.L-1处理对植株的影响不明显,4.0 mL.L-1处理后Pn和Tr与对照相比显著减小,植株表现出不同程度的萎蔫,8.0 mL.L-1处理后各指标均极显著低于对照,且植株严重萎蔫枯死。花蕾期喷施4.0 mL.L-1的24%克阔乐乳剂可高效快速杀灭原植物罂粟。 相似文献
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10.
2甲4氯对罂粟叶绿素含量及光合作用的影响 总被引：5，自引：1，他引：5
试验采用单因素随机区组设计,主要研究了除草剂2甲4氯56%可湿性粉剂对罂粟蕾期植株叶绿素含量(CCI)、光合速率(Pn)、气孔导度(Gs)和胞间CO2浓度(Ci)的影响,筛选出了2甲4氯灭杀罂粟的最适浓度。试验结果表明,不同浓度的2甲4氯均显著地影响了罂粟的叶绿素相对含量、光合作用,罂粟的光合速率、气孔导度和胞间CO2浓度均随施用浓度的增加而降低;2甲4氯对罂粟光合作用的影响速度较快,喷药后2 h即有显著变化,这一结果与这种除草剂的作用特点是一致的。8 g/L这一浓度可快速、高效地影响罂粟光合作用,并导致其形态畸变、代谢停滞而死亡。 相似文献