不同寄主种群B型烟粉虱体内营养和成虫体长差异比较

［目的］ 探讨以黄瓜、番茄、棉花及甘蓝4种不同植物为寄主对B型烟粉虱体内主要营养物质及成虫体长的影响。［方法］ 以长期隔离饲养的4个B型烟粉虱寄主种群为材料,测定不同寄主种群身体含水量、总糖、总脂、总蛋白及成虫体长,比较不同种群上述各项指标的差异。 ［结果］ 4个不同寄主种群B型烟粉虱体内总糖和总脂肪含量存在显著差异,而含水量和总蛋白含量差异不显著。总糖含量以棉花种群最高,占干重的9.62%;而黄瓜种群总糖含量最低,占干重的6.15%。总脂肪含量以棉花种群最高,占干重的49.57%;而番茄种群仅占干重的34.96%,含量最低。不同寄主植物对B型烟粉虱成虫的体长影响显著。雌成虫体长变化表现为：黄瓜种群>番茄种群>棉花种群>甘蓝种群;而雄虫体长变化为: 黄瓜种群>棉花种群>甘蓝种群>番茄种群。［结论］ 不同寄主植物对B型烟粉虱体内总糖、总脂含量及成虫体长有明显影响。     

喷施硼、钼肥对紫云英经济性状及种子产量的影响

在紫云英始花期前,通过叶面单独喷施不同浓度的硼、钼肥,研究硼肥和钼肥对紫云英主要经济性状和种子产量的影响。结果表明：喷施硼肥和钼肥可有效增加紫云英的单株结荚数、每荚种子粒数和种子产量。施用硼肥各处理的紫云英种子产量均极显著高于对照,其中,种子产量最高的为处理B2（即：叶面喷施浓度为1500mg/kg）,达到309.7kg/hm2,比对照增产49%;施用钼肥各处理的紫云英种子产量均极显著高于对照,其中,种子产量最高的为处理Mo3（即：叶面喷施浓度为2000mg/kg）,达到312.9kg/hm2,比对照增产39.4%。因此,建议信阳地区紫云英叶面喷施硼肥和钼肥的最适浓度分别为1500kg/hm2和2000kg/hm2。     

白菜型春油菜角果和种子性状研究

２９份白菜型春油菜品种的研究结果表明，角果长度以中长型和短角型品种为主；角果宽度以中宽型和细角型品种为主。长角型角果（长度≥５．８１ｃｍ）和中宽度角果（直径０．４３～０．４７ｃｍ）品种的每角粒数多，单株产量高。角果长度与角果面积、千粒重和单株产量呈极显著正相关，与每角粒数呈显著正相关，与座果密度呈显著负相关。角果宽度仅与角果面积呈极显著正相关，与其它性状相关皆不显著。     

基于动态反馈A*蚁群算法的平滑路径规划方法

针对移动机器人提出了一种基于动态反馈A~*蚁群算法的平滑路径规划方法。首先,为了克服蚁群算法收敛速度慢的缺点,提出了简化A~*算法来优化初始信息素设置以解决初次搜索的盲目性,并借鉴多策略进化机制加强算法的全局搜索能力。其次,为了进一步提高算法在路径规划中的适应能力,解决陷入局部极小和停滞问题,引入闭环反馈思想来实现参数的动态自适应调节。最后,结合三次B样条曲线对所规划的路径进行平滑处理,以满足移动机器人实际运动路径的要求。通过仿真表明:与原蚁群算法相比,动态反馈A~*蚁群算法平均可减少10.4%的路径成本和65.8%的计算时长。同时,该算法在动态和静态环境中,均能快速规划出一条光滑优质路径。     

环境参数检测系统

随着人们的生活及其生产水平的不断提高,对生活环境和生产环境的要求就显的尤为重要,温湿度及气体浓度的控制就是一个典型的例子,因此温湿度及气体浓度检测系统就是现代生产生活中应运而生的一种智能、快捷、方便可靠的检测系统,特别是在工业生产中如果检测得不准确就会发生许多的生产事故。如化工生产中对温度的检测不当就会导致生产效率的降低和产品质量的下降。而现在所使用的温湿度检测系统通常都是精度为1℃或0.1℃的水银、煤油或酒精温度计进行的温度检测和用传统的物理模拟量的方法进行的湿度检测。这些检测分辨率低,读数困难,而且他们的热容量还比较大,达到热平衡所需的时间较长,并且使用非常不方便。     

Toxicity symptoms and tissue levels associated with excess boron in pear trees

Abstract

High levels of B were applied to the soil around ‘Bartlett’ and ‘d'Anjou’ pear trees in a non‐irrigated orchard. B levels in the soil profile and in the flowers, leaves and fruit were monitored for 6 years. Levels of B in the soil dropped to below 2 ppm within 5 years following the application. By then all visible symptoms of toxicity had disappeared. The B content of ‘Bartlett’ tissues was always higher than that of ‘d'Anjou’ and the symptoms of toxicity were more severe. Under conditions of this research, full bloom blossom cluster levels and levels in the fruit at harvest time were better indicators of toxicity than were the levels in leaves. Boron levels in blossom clusters above 90 and 115 ppm and in fruit above 55 and 45 ppm for ‘d'Anjou’ and ‘Bartlett’ pears respectively were considered to be toxic.     

Boron nutrition and mobility,and its relation to the elemental composition of greenhouse grown root crops I. Rutabaga

Abstract

The nutrition and mobility of B, and its relation to the elemental composition of two cultivars of rutabaga (Brassica napus ssp. rapifera cv. Laurentian and Wilhelmsberger) plants were investigated in greenhouse experiments. Laurentian exhibited a greater response than Wilhelmsberger to continuing B deficiency as indicated by the severity in the roots of brown heart, of external roughness and elongation and of the decrease in B concentration. Signs of B deficiency were not found when the B contents of the root and young leaves were 27 and 56 ug g‐1 DM respectively. Root B levels of 14 and 17–20 μg g^‐1 gave moderate and slight internal signs of brown discoloration. Foliar applications of B partially restored the B concentrations of the roots; however, the mechanism of movement was unclear. The Mg, Mn and Zn contents of roots were the only elements that consistently increased and accumulated under B deficiency. The relative element composition of the root compared to the mature leaves is consistent with the root being supplied predominantly with nutrients by the phloem. Nutrient retranslocation was assessed from the ratio of element concentration in the roots or young leaves to that in the mature leaves. Although Mg, Mn and B exhibited limited mobility under adequate B nutrition they were translocated from mature leaves to younger tissues under B starvation. It is concluded that Wilheimsberger is by virtue of its greater capacity for the retranslocation of B to roots, less sensitive to B deficiency and the brown heart disorder.     

生长延缓剂在肥城桃上的应用研究

ＰＰ３３３和Ｂ９可有效地控制肥城桃幼旺新梢生长量，显著提高花芽质量、成花率和产量。其中５月中下旬和６月中下旬分２次喷布２０００×１０－６（２０００ｐｐｍ）ＰＰ３３３效果也明显；５月上旬土施ＰＰ３３３以每ｍ２树冠投影面积０．３～０．４ｇ有效成分为宜。     

Kisspeptin as a master player in the central control of reproduction in mammals: An overview of kisspeptin research in domestic animals

The hypothalamo‐pituitary‐gonadal (HPG) axis is the regulatory system for reproduction in mammals. Because secretion of gonadotropin‐releasing hormone (GnRH) into the portal vessels is the final step at which the brain controls gonadal activities, the GnRH neuronal system had been thought to be central to the HPG axis. A newly discovered neural peptide, kisspeptin, has opened a new era in reproductive neuroendocrinology. As shown in a variety of mammals, kisspeptin is a potent endogenous secretagogue of GnRH, and the kisspeptin neuronal system governs both the pulsatile GnRH secretion that drives folliculogenesis, spermatogenesis and steroidogenesis, and the GnRH surge that triggers ovulation in females. The kisspeptin neuronal system is therefore considered a master player in the central control of mammalian reproduction, and kisspeptin and related substances could therefore be valuable for the development of novel strategies for the management of fertility in farm animals. To this end, the present review aimed to summarize the current research on kisspeptin signaling with a focus on domestic animals such as sheep, goats, cattle, pigs and horses.     

Construction and Identification of HSP70 Antisense RNA Expression Vector for Genetic Engineering Male Sterility in Plant

[Objective] In order to study the relation between the HSP70 gene and male sterility of plant further. [Methods] Anther specific expression promoter Osg6B of rice was coloned by PCR then connected with HStrlO antisense fragment to construct HSP70 antisense expression vector. The expression vector was identified by PCR experiment and enzyme digestion. [Result]The sequence of coloned Osg6B promoter had 97% homology to the published se-quence, and the cis-regulatory element in promoter area was integrated. HSIrlO antisense expression vector driven by the promoter Osg6B was confired by colony PCR and enzyme digestion. [Conclusion]The construction of expressio~a vector would lay solid foundation for utilization of genetic,engineering male sterility of plant.