汞水平对苋菜种子萌发的影响

采用不同浓度的氯化汞溶液(0.5、1.0、2.5、5.0、10.0、25.0、50.0、100.0 mg/L)对不同品种苋菜种子进行浸种处理。结果表明,Hg+对苋菜种子萌发的影响在低浓度时有促进作用,随着Hg+浓度增加,苋菜种子的根长和芽长都明显减少,当Hg+浓度达到100 mg/L时,苋菜种子见萌芽,但都有红褐色痕迹,即汞污染现象非常明显;Hg+较高浓度时,各个不同品种苋菜种子导电率相对较高,种子活力相对较低。     

宁夏马铃薯脱毒种薯产业的发展现状及对策

为宁夏自治区马铃薯种薯产业的发展提供理论依据和实践参考,介绍了宁夏马铃薯脱毒种薯产业的发展现状,详细分析了该产业在不断发展的过程中出现的主要问题,并提出了相应的对策措施。     

Some Agronomic Strategies for Organic Quinoa (Chenopodium quinoa Willd.)

Quinoa is a potential new seed crop for protein feed and human consumption in Europe, with tolerance to a range of abiotic stresses. For this purpose the study was planned to analyse the effect of important agronomic strategies like nitrogen level, N application strategy, row spacing and harvest time on yield and quality of quinoa. The experiments took place in the field of the experimental station of the Faculty of Science, University of Copenhagen. Three levels of organic nitrogen from slurry was used (60, 120 and 180 kg N ha^?1), supplied either all at once at sowing, or split between sowing and beginning of the reproductive phase. The effect of row spacing and harvest time was studied by harvesting seeds at seed maturity, which occurred 2–3 weeks prior to the mechanical harvest by threshing, and a couple of months after. Yield increased significantly (P ≤ 0.05) with an application up to 180 kg N ha^?1, reaching 2200 kg ha^?1. Increasing N also caused a significantly increased seed weight (up to 3.3 mg) and protein content (up to 17 %). N level did not affect number and amount of weeds. Split application with part of the N applied at bud formation did not have a significant effect on yield. Delayed harvest had a negative influence on seed weight, whereas protein content was stable after harvesting even a month after seed maturity. A late harvest significantly reduced seed germination, being reduced by 50 % after a 2‐month delay. A conclusion from this study is that both yield and protein content of seed can be manipulated by N level and application strategy. Harvest time is important for securing a high seed quality measured as seed germination, seed weight and protein content. A fast germination of quinoa is an important characteristic demonstrating that the crop has good possibilities for being well‐established in the field when free from weeds at the time of sowing. The choice of row spacing is important and depends on weed control method. Weed control strategy should be developed based on modern precision tools.     

球花石楠种子育苗技术

从采种及种子处理、苗圃地选择、整地方式、播种方法及苗期管理、病虫害防治等方面阐述了球花石楠种子育苗技术,可为生产应用提供参考。     

Comparison of phenolic profiles and antioxidant activities in skins and pulps of eleven grape cultivars(Vitis vinifera L.)

Eleven grape cultivars were analysed to explore the variety differences of fresh grape phenolic profiles. The results showed that free phenolics were predominant in grape skins and pulps, and showed the higher antioxidant activities than bound. In 11 cultivars, Muscat Kyoho extracts had the highest total phenolic content in skins(10.525 mg GAE g~(–1) FW) and pulps(1.134 mg GAE g~(–1) FW), and exhibited the highest DPPH radical scavening capacity(EC_(50)=11.7 μg mL~(–1)) and oxygen radical absorbance capacity(ORAC) value(190.57 μmol TE g~(–1) FW) of free phenolic in skin. In addition, the most abundant phenolics in grape skins were found to be flavonoids such as kaempferol in Kyoho skin(541.2 μg g~(–1) FW), rutin, catechin and epicatechin in Muscat Kyoho skin(262.3, 86.3 and 70.0 μg g~(–1) FW, respectively). Furthermore, the principal component analysis showed a strong difference of phenolic profiles with the cultivars, existing forms and distributions. Pearson correlation coefficient analysis showed a significant linear correlation between total phenolic content and antioxidant activity(P0.05). Therefore, both skins and pulps were rich sources of bioactive phenolic compounds, and Muscat Kyoho was the ideal source among all samples.     

刺槐无性系种子园老龄母树截干矮化试验

利用刺槐萌蘖力强的特性,对刺槐无性系种子园老龄化后的树体进行截干试验,促使其萌蘖形成新的树冠,并进行整形修剪,结果表明:老龄母树截干矮化,效果良好,达到预期目标。解决了原母树树体高大釆种困难的问题,为提高刺槐种子园老龄化后种子产量和质量进行了有益的探索。     

河北植物新记录——臭荠属(Coronopus Zinn)

报道了河北种子植物新记录属臭荠属(Coronopus Zinn)及新记录种臭荠[Coronopus didymus(L.)J.E.Smith]。     

Development of IP and SCAR markers linked to the yellow seed color gene in Brassica juncea L.

Previous studies showed that the yellow seed color gene of a yellow mustard was located on the A09 chromosome. In this study, the sequences of the molecular markers linked to the yellow seed color gene were analyzed, the gene was primarily mapped to an interval of 23.304 to 29.402M. Twenty genes and eight markers’ sequences in this region were selected to design the IP and SCAR primers. These primers were used to screen a BC₈S₁ population consisting of 1256 individuals. As a result, five IP and five SCAR markers were successfully developed. IP4 and Y1 were located on either side of the yellow seed color gene at a distance of 0.1 and 0.3 cM, respectively. IP1, IP2 and IP3 derived from Bra036827, Bra036828, Bra036829 separately, co-segregated with the target gene. BLAST analysis indicated that the sequences of newly developed markers showed good collinearity with those of the A09 chromosome, and that the target gene might exist between 27.079 and 27.616M. In light of annotations of the genes in this region, only Bra036828 is associated with flavonoid biosynthesis. This gene has high similarity with the TRANSPARENT TESTA6 gene, Bra036828 was hence identified as being the gene possibly responsible for yellow seed color, in our research.     

大兴安岭地区兴安落叶松种子园球果花蝇防治技术

利用综合防治方法对加格达奇兴安落叶松种子园落叶松球果花蝇进行防治,结果表明:防治效果达到90%时,种子园出种率提高了10%,大幅度减少良种种子损失,增加良种供给率。     

低碳节约型园林的探索

随着社会经济和城市建设的迅速发展，自然资源和生态环境等面临着巨大压力，矛盾日益突出，本文主要结合目前非常流行的低碳经济讨论了建设节约型的园林。