美国L．R．道纳逊教授帮助我院发展虹鳟养殖

美国华盛顿大学海洋水产学院著名养殖专家L．R．道纳逊(L．R．Donaldson)教授，从事鲑科鱼类养殖与育种工作多年。他得悉我国目前缺少优良的鲑鳟鱼类品种之后，即积极帮助我院引进优良品种。今年三月份，他从西雅图空运虹鳟发眼卵给我院后，     

德阳市资源状况及墙体材料发展品种初探

墙体材料性能和价格对建筑工程的性能、质量和经济效益有着举足轻重的影响,其热工性能直接影响着建筑能耗,约占其25%。为了响应国家墙改及建筑节能等国策,推动我市墙材工业沿着可持续发展的道路健康发展,阐述了墙体材料的发展趋势,根据德阳市的自然资源、废渣排放等情况,结合德阳市自身的特点,探索了适合德阳市长远发展的墙材产品品种。     

用因子搭配法作寒露风长期预报

本文扼要介绍如何用因子最佳搭配法建立预报方程;并选用4个气象因子,用因子最佳搭配法作寒露风长期趋势预报,效果较好。     

美洲斑潜蝇对不同番茄品种的选择性

[目的]明确不同番茄品种对美洲斑潜蝇的选择性差异.[方法]在温湿度恒定的小气候环境中,研究了美洲斑潜蝇对18个不同番茄品种及材料的选择性.通过零频率估计法测定了美洲斑潜蝇幼虫的种群密度,同时调查虫情指数.[结果]美洲斑潜蝇对不同番茄品种的选择性存在差异.野生番茄品种ZBNH11的虫情指数最低,其次是包头市农业科学研究所选育出的15个番茄品种及材料,而引进的钻红八号和普罗旺斯的虫情指数最高.[结论]研究结果为合理利用抗性品种减轻美洲斑潜蝇危害提供了理论依据.     

青岛水产养殖业的现状及发展前景

近年来,在“以养为主”的方针指导下,青岛市水产养殖业取得了长足发展。1999年全市水产养殖产量72．5万吨,产值33亿元,水产养殖在全市沿海地区致富奔小康和率先基本实现现代化进程中起到了龙头带动作用。     

On-farm Conservation of Landraces of Rice （Oryza Sativa L.） through Cultivation in the Kumaun Region of Indian Central Himalaya

The Himalayan region is a known hot spot of crop diversity. Traditional varieties (usually called primitive cultivars or landraces), having withstood the rigors of time (including harsh climatic conditions as well as attacks of insects, pests and diseases), can still be found in crop fields in rural parts of Indian Central Himalaya (ICH). These landraces harbor many desired traits from which, for example, varieties that are tolerant/resistant to abiotic/biotic stresses could be developed. In addition to the above benefits, landraces provide a basis for food security and a more varied and interesting diet. Some landraces are also known to be of medicinal value. These, along with some lesser known hill crops, are often referred to by different names such as under exploited crops, crops for marginal lands, poor person crops, and neglected mountain crops. The Himalayan region continues to be a reservoir of a large number of landraces and cultivars whose economic and ecological potential is yet to be fully understood and/or exploited. Indians have had a history of rice cultivation since ancient times. Farmers, including tribals inhabiting the IHR, still cultivate a plethora of landraces of rice and thus directly contribute towardson-farm conservation of valuable germplasm and help in the preservation of crop diversity. The present paper looks at the on-farm conservation of rice germplasm, which is still practised in the Kumaun region of ICH.     

玛瑙美丽又益眼

参加一次活动,主办方给每位来宾发了用精致木盒包装的半块玛瑙石。笔者把这块色彩丰富、美丽动人的玛瑙安放在精品柜上,经常欣赏品读,从而渐渐对其产生了浓郁的兴趣。     

不同冬小麦对盐处理和干旱胁迫交互作用响应的差异性分析

通过对抗逆性不同的6个烟台冬小麦品种在盐处理和干旱胁迫交互作用进程中叶片相对含水量（RWC）,膜脂过氧化产物（MDA）和抗氧化酶活力（SOD,POD,CAT）及渗透调节物含量（脯氨酸,可溶性蛋白）的分析,以了解不同冬小麦品种对盐处理和干旱胁迫交互作用响应的生理调节差异。研究表明,在水分供应充足条件下盐处理10 d,6个品种冬小麦生长良好并和对照没有差异,但在干旱胁迫中盐处理组较对照MDA含量低,RWC和抗氧化酶活力和渗透调节物含量均高,且叶片萎蔫较对照出现晚。但经盐处理的6个冬小麦品种对干旱胁迫响应有差异。在长期干旱(12 d),抗旱性强的品种RWC（81%）明显高于抗旱性弱的（62%）,前者叶片MDA含量较后者低30%,抗旱性强的品种抗氧化酶活力和渗透调节物含量略低于抗旱性弱的品种,但是差异不明显。在盐处理和干旱胁迫交互作用下,盐离子自身可作为渗透调节物既增加了土壤的持水力又提高了细胞保水力而使冬小麦耐旱性增强。抗旱性强的冬小麦品种对盐处理反应敏感且保水性强,细胞膜脂过氧化程度较低,故耐旱力高,抗旱性弱的品种则相反。研究进一步表明,在未来干旱地区实施适度的盐水灌溉可提高冬小麦的耐旱力,但选择抗旱力强的冬小麦品种是实施这一农业耕作措施的关键。