13个柑桔栽培品种对柑桔潜叶蛾的抗性研究

对北碚447、丰脐、沙田柚等13个柑桔栽培品种进行虫情指数调查及自然接种,调查不同品种上的潜叶蛾的发育历期、各时期的死亡率。得到柑桔品种对潜叶蛾的影响多在卵期及3龄幼虫,而在1龄、2龄和4龄期不存在差异。     

Study on the Obtaining of Transgenic Wheat with GNA Alien Gene by Biolistic Particle

The immature embryos of wheat plants, cv. Jing 411, 12 - 14 days after pollination, were cultured on SD2 medium for callus induction. After 10 days culture, 800 wheat calli were bombarded by biolistic particle coated with theDNA of plasmid pBI121-2 harboring both Galanthus nivalis agglutinin gene and bar gene. 67 green plants were finally regenerated from the bombardment calli on selection medium containing 4mg/L Basta. The results of bioassay by both inoculating wheat aphids onto the plants and applying Basta solution of 50 mg/L and 75 mg/L onto the wheat leaves in the field, and the molecular analysis, such as PCR and Southern blotting, indicated that 8 T2 plants contaning the target genes were obtained.     

Γ（Gamma）分布及其在辽东天然阔叶混交林中的应用

本又从Γ分布的构造及性状入手，研究了用Γ分布拟合天然阔叶混交林直径分布结构，取得了拟合成功率为９５．２％的理想结果，较原林业中常用的Ｗｅｉｂｕｌｌ分布的拟合成功率提高了１９．０％。     

奶山羊颈迷走神经传出神经元胞体的定位和形态学特征

将HRP注入颈迷走神经干后,在迷走神经背核的全长出现标记细胞,但该核的尾部以特征性的巨、大或中型梭形标记细胞为主而区别于核的前和中部。在孤束内侧核有散在的类似于背核的标记细胞。在疑核可见大、中、小三型标记细胞,但在疑核嘴侧部的腹侧群即面后核无标记物。在疑后核、上颈髓中间带区有类似于胸髓交感节前神经元的中型标记细胞和分布特征。在脊上核的背侧群和上颈髓的腹角背内侧核和副神经脊髓核有一些大多极标记细胞。     

应用采食模式改进蛋鸡饲喂制度研究

用40周龄 ISA 蛋鸡2116只,随机分为试验组和对照组,同幢鸡舍的2492只为大群组,根据基础日粮,均日喂二次,大群组日喂基础日粮四次,以研究对蛋鸡的影响。结果表明,试验组与对照组的产蛋率、蛋重及蛋的品质均无显著差异,但试验组的饲料成本减少14.74％,主要营养素蛋白质、能量和氨基酸的消耗也分别降低2.17％、2.92％和12.88％。作者认为,蛋鸡对饲料中营养素的利用能力,可能存在“时间节律”性因素的影响。     

猪粪便中兽药盐霉素残留的降解动态研究

兽药抗生素在畜禽养殖生产中被大量使用,由于这些药物的大部分会被排入粪便并随粪便作为肥料而随处散播,增加了环境风险.通过实验室模拟不同的环境条件,研究了常用兽药抗生素--盐霉素在畜禽粪便中的降解动态及其影响因素(如药物残留浓度、粪便含水量、微生物及光照等).结果表明,盐霉素在粪便中的降解主要是微生物降解,光降解和化学降解只占很小比例,灭菌组的降解速率明显低于未灭菌组(P＜0.05),而光照对盐霉素的降解速率影响不大(P＞0.05);盐霉素的降解速率随粪便中盐霉素起始浓度增加而降低,表明粪便中降解微生物对盐霉素的浓度敏感;粪便含水量的增加明显加快了盐霉素残留的降解速率,因而在粪便施入农田前,可以通过降低粪便中盐霉素残留浓度或提高粪便含水量等方法加速盐霉素的降解,以降低其对环境土壤和水体的风险.     

旱地春小麦新品系8821-1-1选育报告

春小麦新品系8821-1-1是定西市旱作农业科研推广中心以自育材料RFM Ⅲ-87-A为母本、外引品种宁春10号为父本杂交选育而成.在2004年西北春小麦旱地组区域试验中,平均折合产量2 704.95 kg/hm2,较对照品种定西35号增产1.20%.该品系适应性广,抗旱性较好,田间表现抗病、抗青干性强,较抗倒伏.籽粒含粗蛋白15.81%、湿面筋33.1%,沉降值20.7 mL,降落值176 s;经粉质仪分析,吸水率59.8%,面团形成时间2.4 mim,稳定时间1.6 mim,软化度153 F.U,评价值37.适宜在甘肃定西、会宁、榆中、永靖、兰州,宁夏海原、西吉等地以及生态类似地区旱川台地、山坡地种植.     

内蒙古武川旱农试验区马铃薯干旱监测系统的研究

根据１９９３－１９９５年的试验资料及应用有关的气象资料，提出了降水量及土壤不不分的干旱指标，采用农田水量平衡方法建立了农田土壤水分动态预报模型，通过检验，对０－１００ｃｍ深土壤水分邓相对误差为±５．７％，提出了干旱预报方法，在以 上工作的基础上，建立了一个针对内蒙古旱农试区马铃的干旱监测系统。     

冈优12的组合特性及其高产技术途径的探讨

本文研究了杂交水稻新组合冈优12的组合特性及其高产技术途径。结果是:冈优12具有叶片宽大直立,功能期长,分蘖力中上,成穗率较高,大穗中粒,经济指数高等特性;其库容量大,源流不协调;结实率与产量存在显著相关,着粒数(在163粒以上)与产量存在显著负相关。高产技术途径是在保证足够穗数基础上,减少不实颖花数,提高结实率。     

Defense response of tomato fruit at different maturity stages to salicylic acid and ethephon

In order to elucidate whether fruit maturity stage influence the induced resistance of exogenous elicitors in tomato and the involved mechanisms, we investigated the defense responses of tomato fruits against Botrytis cinerea, ethylene production and internal quality following treatments of fruit with salicylic acid (SA) or ethephon (ET) at mature green (MG) and breaker (BR). SA significantly suppressed decay and disease incidence in tomato fruits at both MG and BR stages, along with higher expression level of PR1 gene after 2 days of treatment. All fruits treated by SA had lower contents of ethylene and lycopene. The ET-treated fruit at both maturity stages showed lower disease incidence and higher level of PR2 and PR3 expression compared with the control fruit. ET treatment significantly enhanced ethylene and lycopene contents, and accelerated fruit ripening. Our results suggest that SA and ET induced disease resistance in fruits by mediating the expression of different pathogenesis-related genes and have different effects on fruit ripening, which in turn influences the disease resistance of tomato fruits.