丰宁“中国沙棘”资源及种群表型结构的研究

本文用样地调查和统计分析的方法研究了丰宁“中国沙棘”主要经济性状的变异,探讨了性状相关和各主要性状的组配情况,分析了主要经济性状变异的频数分布及种群特征和优种分布范围。认为丰宁的“中国沙棘”是以主干型、桔黄扁圆果、褐色种子植株为主体的多态型种群系统,是品质较好的种质资源,是沙棘树种改良的珍贵材料。     

Organic substance metabolism during seed germination ofPinus bungeana

The metabolism of fats, proteins and carbohydrates and change of enzyme of seeds ofpinus bungeana during the germination were conducted by the methods of gas-liquid chromatography, flow injection, colorimetric analysis of spectrophotometer, to provide theoretical basis for seeds dormancy, germination and storage of seeds of forest tree. The results indicate that (1) carbohydrates were first utilized during germination of seed ofpinus bungeana; (2) stored substances in seeds began to decompose quickly after radicale broke through seed coats; (3) the activity of enzymes in the seeds does not always coincides with the increase or decrease in quantity of its responsible substance during germination of the seed. Changes in stored substance relate to metabalism of other metabolism of other materials and the use of hydrolysates.     

影响啤酒大麦种子发芽整齐度的因素

综述影响啤酒大麦种子发芽整齐度的因素 ,着重介绍了品种、籽粒整齐度 (包括粒重和粒位 )对发芽整齐度的影响 ,旨在为培育优质啤酒大麦提供借鉴。     

苹果酸处理水稻种子对秧苗根系及抗寒性影响的初探

水稻种子经苹果酸处理后,淀粉酶过氧化氢酶和脱氢酶活性均有提高。其幼苗根系发达,根/茎叶比重增加。幼苗经5C冷处理后,超氧化物歧化酶活性和叶绿素含量虽表现出下降,但明显高于对照。丙二醛含量和电解质渗漏率比对照为低。苹果酸处理在一定程度上提高了水稻秧苗素质及抗寒能力。     

多花黑麦草播期试验(1987～1988年)

本试验研究了7个不同播期对多花黑麦草出苗、生产性能的影响.结果表明:在江西清江种草养畜试验站从8月中旬至11月中旬均可播种多花黑麦草,尤以9月中旬至10月中旬更为适宜.     

钾肥对草坪草抗性的影响

钾肥是草坪草三大营养元素之一，对形成和加强草坪草的抗性起着十分重要的作用。论述了钾肥对草坪草寒、旱、热、病虫害及盐碱等抗性的影响及其作用机理，为草坪建植、管理等生产实践及系统化研究提供一定的依据。     

大豆种衣剂有效成分配比优选及应用研究I大豆种衣剂有效成分的选择及应用

植物生长调节剂Cc使大豆株高降低，根系活力增强，总根长增加，地下部干重增中18.41%～35.13%，差异显著，地上部干重增加6.58%～15.79%；多元络合态微肥Mi使大豆株高增加叶面积增大，地上、地下部干重分别增加8.5%～13.16%、11.31%～15.30%，差异均显著，杀虫杀菌剂Ki使大豆病株降低20～21.5个百分点，低浓度的Ki使大豆出苗率增加，根系活力增加，地上、地下部干重分别增加3.95%～14.47%、5.32%～14.41%，高浓度的Cc、Ki对大豆出苗不利。     

杏种子与种胚的超低温保存研究

含水量为６．９％带有内果皮的种子，以－５Ｃｍｉｎ＾－１速率降至－８０℃，放入ＬＮ２，在室温缓慢解冻，成活率可达９１．５％。去掉内果皮含水量为７．１％的种仁，以上述方式保存，成活率也可达到８８．２％。含水量是超低温保存杏种子最重要的因素。研究表明：冰冻保护剂ＤＮＳＯ对杏种子的超低温保存影响不大。含水量为４．８％￣８．１％去掉子叶的种胚超低温保存后ＴＴＣ染色成活率为８２．８％，并能在ＭＳ培养基上发育为     

Apoplastic redox metabolism: Synergistic phenolic oxidation and a novel oxidative burst

The plant apoplast is an important mediator of communication between the cell cytoplasm and its surroundings. Plant cell suspensions offer a convenient model system to gain insight into apoplastic physiology. Here, we describe a novel phenomenon that took place when two naturally occurring phenolics were added together to either soybean or tobacco cell suspensions. Acetosyringone (AS) and/or hydroxyacetophenone (HAP), phenolics found in the extracellular/apoplast of tobacco cells, were added to soybean or tobacco cell suspensions undergoing an oxidative burst. Individually, AS appeared to be utilized as a typical peroxidase substrate to scavenge hydrogen peroxide, while HAP was utilized at a much lower rate. However, when added together the rate of utilization of both phenolics increased and surprisingly resulted in the production of hydrogen peroxide. We have further characterized this novel phenomenon in suspension cells. This study demonstrates that certain phenolics in plants can cause co-oxidation which, as in animals, could alter the structure and bioactivity of surrounding phenolics.     

低氧胁迫下黄瓜幼苗根系多胺代谢的变化

 利用外源Spd、PAO 抑制剂研究了黄瓜幼苗根系在低氧水培时的生长状况以及内源PAs、H₂O₂ 含量和PAO活性的动态变化。结果表明, 外源PAs对低氧胁迫下黄瓜幼苗根系的生长有促进作用;低氧处理后3种PAs含量都明显上升, 外源Spd和PAO抑制剂增加了根系中的PAs含量, 降低了根系中H₂O₂ 含量, 减缓了低氧伤害; PAs为低氧胁迫的应激产物, PAO为适应酶类, 其活性随PAs含量的变化而发生变化。