对花卉种植中巧用昆虫防治害虫的探讨

为避免虫害防治采用的化学药剂,对环境和植物本身所造成的污染,在许多的花卉种植基地中,已经开始使用"以虫治虫"的方式,进行虫害的抑制。巧用昆虫自身的生物特性进行花卉虫害的治理,不仅能够实现环保目标,还能有效降低生产成本,实现花卉种植的生态发展。     

2015年《林业科技通讯》征订征稿启事

<正>尊敬的朋友:新年好!在伴随着我们对中国梦充满无限美好想往的2015年到来之即,《林业科技通讯》又回到读者面前。我们希望《林业科技通讯》能给广大读者带来新面貌和新契机。我们将继续秉承和发扬本刊优良传统和办刊宗旨:为基层生产、科研、教学人员和广大林农服务,促进林业科学与技术交流。《林业科技通讯》将在原有基     

阿根廷:2016年柠檬出口形势看好

今年阿根廷柠檬产量可能会增长10%。阿根廷国内经济持续复苏,但仍存在危险,由于当前政府更迭预计上半年会出现通货膨胀。据估计,阿根廷柑桔类水果出口将会继续增长。图库曼省和西北地区的厄尔尼诺现象带来的影响仍在继续。不过,该地区许多农场已开始采收柠     

武当山区雪莲果有机丰产栽培技术探索

雪莲果原产于南美洲的安第斯山脉,2008年传入武当山脉,是一种生长于地下的新型有机保健水果。三年来,通过设立不同海拔高度、不同种植密度、不同种植方式、不同留枝数、不同施肥方式等试验研究,探索武当山区雪莲果有机丰产栽培技术,形成一套标准,以促进雪莲果在武当山区大面积推广。     

枣园病虫无公害管理工作历

1冬季管理 1.1时间在12月至翌年3月。主要防治对象：枣粘虫、红蜘蛛、枣粉蚧、龟蜡蚧等越冬病虫害。 1.2防治方法。①刮树皮并集中烧毁,消灭树皮缝中的越冬虫、卵和病原菌。②清洁枣园,处理主干、主枝处诱杀害虫的草把。③刨除枣疯病植株,铲除病害、根蘖。④冬季修剪,幼树定干,     

温室一茄多果快速育成技术

随着嫁接技术在蔬菜育苗中的广泛应用,根据近年来兴起的一茄多果嫁接技术与园艺景观造型相结合的趋势,介绍了一种改进的一茄多果嫁接技术,技术的流程更简洁,也更易于操作,可使经济效益与人文景观效果得到共同提升。     

甜瓜镰刀菌果腐病菌拮抗菌筛选及其拮抗性研究

以新疆喀什地区伽师县盐碱地土壤为材料,通过平板对峙法和琼脂扩散法筛选获得对腐皮镰刀菌(Fusarium solani)BM1具有显著拮抗作用的菌株JS6-1和JS3-4。两菌株发酵上清液对甜瓜果腐病病原菌的抑菌圈直径分别为22.90和21.05 mm,通过形态学观察、生理生化试验和16s rRNA基因序列分析初步鉴定为贝莱斯芽孢杆菌Bacillus velezensis JS6-1和暹罗芽孢杆菌Bacillus siamensis JS3-4。抑菌谱测定结果表明两株菌对尖孢镰刀菌Fusarium oxysporum KW1、香梨黑斑病菌链格孢菌Alternatia alternata HB2、香梨腐烂病菌Valsa mali var. pyri FL1等9种植物病原菌均有较强的抑制作用。酶活及产铁载体测定结果表明,两株菌可产生纤维素酶、蛋白酶、淀粉酶、葡聚糖酶和铁载体等物质。采用酸沉淀法提取两株菌脂肽类物质,并以腐皮镰刀菌Fusarium solani BM1为指示菌进行抑菌试验结果表明,两株菌脂肽类粗提物对病原菌的抑菌圈直径分别为20.55和19.05 mm,对病原菌孢子萌发抑制率分...     

一元立木材积表的适用精度检验方法探讨

国家森林资源连续清查中长期使用的一元立木材积表,其适用精度如何,一直是值得关注的问题。以第九次全国森林资源清查2014年陕西省的栎类(Quercus spp.)样地调查数据为基础,对其采用的4个栎类一元材积表的适用精度检验方法进行探讨。利用栎类样地的466组平均胸径和平均树高数据,以及全部平均高测定样木的1 447组胸径和树高成对数据,按2套方案分别建立4个栎类的新的树高曲线,从而形成4个新的一元材积表,并与原来的材积表进行对比,计算总体相对误差。结果表明:原一元材积表有2个的估计误差在±3%以内,另外2个的估计误差超出了±5%,误差最大的达到了-10%左右。因此,长期使用固定不变的一元材积表可能会导致材积估计结果出现偏差,建议每10年或20年对一元立木材积表(模型)进行适用精度检验,对偏差过大的一元材积表应该及时予以修正。     

山荆子类受体蛋白MbRLP7负调控杜梨对腐烂病的抗性

山荆子类受体蛋白MbRLP7为研究对象，结合生物信息分析、功能验证和表达量测定，分析了其在对腐烂病菌的抗性中的作用和调控机制。结果表明，MbRLP7编码的氨基酸序列与拟南芥AtRLP6和AtRLP7相似性最高，分别为43.0%和42.8%。MbRLP7启动子区域存在多个响应逆境相关信号的顺式作用元件，并响应腐烂病菌信号。将该基因导入杜梨悬浮细胞获得过表达细胞系3个。接种腐烂病病原菌Valsa pyri后，过表达细胞的发病速度显著高于野生型细胞。腐烂病菌代谢物处理后的所有过表达细胞系的细胞存活率显著低于野生型。此外，该基因的过表达增强了腐烂病菌代谢物对病原体相关分子模式（pathogen-associated molecular patterns,PAMPs）触发的免疫反应（PAMP-triggered immunity,PTI）、活性氧相关基因和病程相关蛋白PR1的诱导。综上所述，MbRLP7负调控杜梨对腐烂病的抗性，PTI、活性氧和PR1参与了该调控过程。     

Effects of Lactic Acid Bacteria and Fructooligosaccharides on Growth Performance,Nutrient Digestibility and Serum Biochemical Indices of Arctic Foxes (Alopex lagopus) during Early Growth Period北大核心CSCD

This experiment was conducted to study the effects of dietary lactic acid bacteria (LAB) and fructooligosaccharides (FOS) on growth performance, nutrient digestibility and serum biochemical indices of Arctic foxes (Alopex lagopus) during early growth period. Sixty male post-litter Arctic foxes with the average body weight of (1.16±0.15) kg and at the age of (45±3) days were randomly assigned to 4 groups with 3 replicates per group and 5 foxes per replicate. The foxes were fed the following diets, respectively: basal diet (control group), basal diet+3×109 CFU / kg LAB (LAB group), basal diet+5 g / kg FOS (FOS group) and basal diet+3×109 CFU / kg LAB+5 g / kg FOS (LAB+FOS group). The experiment lasted for 30 days. The results showed as follows: 1) on the days 1 to 15, the diarrhea rate of foxes in the LAB group and LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05). On the days 16 to 30, the average daily gain of foxes in the LAB+FOS group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); the diarrhea rate of foxes in the LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); compared with the FOS group, the feed to gain ratio of foxes in the LAB+FOS group was significantly decreased (P<0.05). 2) The dry matter digestibility of foxes in the LAB + FOS group was significantly higher than that in the control group and FOS group (P < 0.05), but had no significant difference with LAB group (P>0.05). There were no significant differences in nitrogen intake, fecal nitrogen, urine nitrogen, nitrogen deposition, net protein utilization and protein biological value among all groups (P>0.05). 3) Serum total protein (TP) content of foxes in the LAB+FOS group was significantly higher than that in the FOS group (P<0.05), but had no significant difference with control group and LAB group (P>0.05). Serum albumin (ALB) content of foxes in the LAB group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB+ FOS group (P>0.05). Serum urea nitrogen (UN) content of foxes in the LAB+FOS group was significantly decreased compared with the control group (P < 0. 05). In conclusion, the combined supplementation of 3 × 109 CFU / kg LAB and 5 g / kg FOS in the diet is beneficial to reduce diarrhea rate, improve dry matter digestibility, improve body immune level, and promote the growth of Arctic foxes during early growth period. © 2023 Chinese Journal of Urology. All rights reserved.