云南省盈江县水稻插秧机发展之我见

随着社会的发展,农业机械化的推广应用对提升农业生产工作有着十分积极的作用。盈江县自2008年开始推广水稻插秧机以来,取得了一定的成效。着重探讨盈江县水稻插秧机推广的现状,分析存在的问题,并提出相关对策,希望有助于该县水稻插秧机的推广应用。     

优质籼型水稻光温敏核不育系万金S的选育

万金S是广东海洋大学农学院利用扬稻6号(9311)的育性变异单株育成的水稻光温敏核不育系,于2009年9月通过广东省技术鉴定。万金S不育期间败育彻底,不育性稳定,不育株率100%,花粉不育度和套袋自交不实率均为99.99%;不育起点温度较低(23～24℃),在湛江不育期135 d以上;开花习性好,异交结实率高达60%以上;米质优,达国标《优质稻谷》2级标准;所配组合杂种优势强,稻米品质优,其中万两优香1号于2011年6月通过了海南省品种审定。     

根瘤农杆菌介导的水稻转基因方法的优化研究

[目的]优化根瘤农杆菌介导的水稻转基因方法。[方法]通过对经典水稻转基因方法的优化和改进,高效获得转基因水稻苗。[结果]使用成熟胚,采取升汞灭菌,侵染时农杆菌的OD600值为0.1时,转化效率最高,较原方法提高约23%。[结论]该研究为以根瘤农杆菌介导的水稻转基因研究提供了技术参考。     

Germination-enhancing and zinc-sparing roles for selenium in broccoli

Large areas of China have soils low in both available selenium (Se) and zinc (Zn). In order to investigate whether Se supplied as either selenate or selenite can increase germination and growth compared with low-Se controls we used broccoli, an important vegetable with anticancer effects, especially when biofortified with Se. Broccoli was grown under both Zn adequacy and Zn deficiency to determine whether interactions between these minerals affect plant growth. Selenite and selenate at a wide range of doses increased the speed and extent of germination. Both inorganic Se forms increased early root and shoot growth at low concentrations, with selenite having a stronger effect than selenate. A sand culture trial showed a similar growth increase due to low-dose Se under Zn deficiency but not under Zn adequacy. Conversely, at high Se levels, the results provided evidence from biomass, water use, photosynthesis and gas exchange that broccoli growth was inhibited at high Se levels, with selenite being more toxic than selenate. In this broccoli trial, the two Se forms were equally effective in increasing leaf Se concentration, whereas in most plants selenite is largely converted to organic Se forms and stored in the roots. This study suggests that Se, supplied either as selenate or selenite, may improve germination and growth in broccoli, especially on Zn-deficient soils. Field trials conducted on soils which are very low in both plant-available Se and Zn are needed.     

水稻的施肥时期和方法

优质高产水稻的施肥时期和方法很重要,起着决定性的作用,因此重点分析几种基本肥料的施肥时间以及方法,仅供参考。     

BP神经网络结合正交试验法优化Bacillus velezensis Z-27菌株培养基组分

将BP人工神经网络(Artificiai neural network)技术与传统的正交试验方法相结合,提出一种新的试验分析和处理方法,利用神经网络特有的自学能力,对主要影响因素进行仿真优化,获得Bacillus velezensis Z-27菌株培养基组分,即玉米粉2.0％、豆饼粉1.5％、MnSO4· H2O 0.07％,起始pH为7.0、接种量为2.0％,应用优化得到的培养基组分进行验证试验,取得了较好的效果.     

Histopathology of Hematopoietic Tissue in Channel Catfish,Ictalurus punctatus,with Anemia

Outbreaks of anemia (CCA) in channel catfish, Ictalurirs punctatus, in Mississippi occur predominantly during spring and fall. Between October, 1990 and May, 1991, twenty-seven cases of CCA were submitted to the Mississippi Cooperative Extension Service-College of Veterinary Medicine Fish Diagnostic Laboratories. Histologic lesions were identified in the head and trunk kidneys of all affected fish. The head kidney contained less than 25% immature hematopoietic tissue in 3 of 22 cases (14%). 25-50% immature hematopoietic tissue in 7 of 22 cases (32%), and greater than 50% immature hematopoietic tissue in 12 of 22 cases (54%). The trunk kidney contained less than 25% immature hematopoietic tissue in 5 of 27 cases (18%), 25-50% immature hematopoietic tissue in 15 of 27 cases (56%), and greater than 50% immature hematopoietic tissue in 7 of 27 cases (26%). The histopathologic findings noted in cases of CCA from Mississippi affect primarily the hematopietic tissues of the head and trunk kidneys.     

杂草稻对粳稻生长及产量的影响

在同期播种情况下,和粳稻相比,杂草稻出苗时的叶片更肥长、营养生长期的植株更高、分蘖数多达4倍以上。不同生物型杂草稻的落粒性差异较大。杂草稻密度愈高对栽培粳稻的产量影响愈大。     

云南省普洱市民族食虫文化初探

从普洱民族食用昆虫的历史,民族食用昆虫的特点,食用昆虫与民族风情,民族食用昆虫的烹饪方法以及独特的民族昆虫菜谱等方面系统地介绍了云南省普洱市食虫文化的民族特征、内涵及其存在形式。