茎叶体

Species animalcula were isolated from the wounds of Dracaena cochinchinenis stems. During culture period, the culture mediums or the mycelia of four species among the animalcula turned red, which is in some degree similar to the colour of dragon's blood. They were identified as Fusarium graminearum, and another unknown three species of Fusarium.

从剑叶龙血树茎干损伤部位及叶子斑块部位共分离得到24种微生物，其中有4种在培养时候，培养基或菌体本身不同程度的呈现红色，在一定程度上与龙血竭的颜色相类似，经鉴定，它们是Fusarium graminearm和三种未知镰刀菌属真菌Fusarium sp。。

With diploid, multiploid medicinal plant has the characteristics of giantism, which express in roots, stems, leaves, flowers and fruits

药用植物多倍体与二倍体相比具有根，茎，叶和花果的巨型性，抗逆性强，次生

Result The results indicated that, the calli development rate from leaves inducement was lower than that from leafstalk and young stems.

以葡萄叶为外植体时，诱导的愈伤组织出愈率很低；以叶柄和茎为外植体时，愈伤组织的出愈率均较高。

This paper reports something about it .The callus was induced and proliferated by using young stem , leaf and leafstalk as explants .which came out in early spring . In this paper , its effects on induction and proliferation were discussed by using different kinds of explants and hormone and different physical and chemical factors.The growth circle and some physiological and biochemical factors were studied during the culture of callus, a set of rapid propagation techniques were founded, which was rapid, efficient and steady.

本文以丹参初春萌发的幼茎、叶、叶柄为外植体，探讨了不同的外植体、不同的植物生长调节物质、不同的理化因子对愈伤组织的诱导和增殖效应，研究了黑暗和光照条件下愈伤组织细胞培养生长周期以及生长周期中生理生化指标的变化特征，摸索了一套快速、高效、稳定的丹参快速繁殖技术，为丹参组织培养、次生代谢物的生产提供理论依据，为丹参快速繁殖应用于生产提供技术支持。

The higher the inoculation concentration of the strain is during seed germination, the more quantity the strain in host plant tissues. When strain B504-1121 was inoculated on lower petioles, it could transfer into upper tissues, however it only habitate in leaves if it was inoculated on leaves.

在下部叶片叶柄处接种的菌体可向上移动，通过茎进入上部叶片；在叶部接种的菌，则只在接种叶内定殖，不再向其他部位转移。

After being infected by PWN, the needle of 1-year-old pine seedlings with the lignified stem began to change to be bronzing or brown and wilted, which appeared at the phyllopodium and expanded to leaf apex, then the needles withered and died.

而茎已完全木质化的1年生松幼苗和4～5年生幼树离体枝感染松材线虫后，外部症状表现为发病叶褪绿、变红褐色或褐色且萎蔫，症状首先出现在叶基部，很快向叶尖扩展，至整个针叶枯萎死亡。

Cauline leaves pinnatisect or pinnatifid, broader; stems pilose with trichomes to 1 mm

茎生叶羽状全裂或者羽状半裂，宽；茎具柔毛的具毛状体到1毫米 2 C。

The response may change the fate of the turions in the second year,and affect the maintenance of the populations.

在野外池塘中，利用3种不同营养状况的底质研究底质营养盐对菹草生长及养分分配的影响，结果表明：沉水植物菹草面对底质营养盐的胁迫出现了急性的生理生化反应，在生长初期叶片总的可溶性糖含量在肥沃的底质上高于贫营养底质上；根、茎、叶和石芽各构件都具有异速生长现象，并且表现规律不一样；菹草的根冠比随底质营养盐的不同而变化；随着营养条件对菹草生长胁迫加重，根、冠的异速生长愈明显，同时石芽的N∶P和C∶N比率显著受底质营养盐的影响，而菹草叶片和茎N∶P和C∶N比率不受底质肥力的影响，这些响应将改变石芽第2年的命运和影响种群的维持；在胁迫生境下，菹草首先分配资源到无性繁殖体--石芽上以便维持种群的延续，以回避策略应对底质营养盐胁迫。

The results were as follows:1 The explants with two phyllomes(about 0.2-0.5mm in size )were found to be suitable for virus-free seedling culture , which were cultured on solid MS medium supplement with 6-BA,NAA and IAA ,The result indicated that the plantlet was over 30% after three months.

主要结果如下： 1。取带2个叶原基(长度约为0.2-0.5mm)的茎尖为外植体，在附加6-BA、IAA和NAA的MS培养基上进行3个月的培养，成苗率达30％以上。另外，在切取茎尖前对薯苗热疗(37℃)4周，在基本不影响成苗率的同时，可大幅度提高脱毒率。

The cultural characteristics between hypovirulent strain and high virulent strain was highly distinct.The pathogen of banana anthracnose latents on fruit, foliage, bract, blossom and stalk, stalk of plants with this disease is the most important carrier. The infection type of bannana fruit anthracnose is latent infection.

在香蕉果皮、叶、苞片、花器及假茎上均有香蕉炭疽病菌潜伏，假茎的病残体带菌率最高，为主要的侵染来源；采后香蕉果实上炭疽病侵染型为潜伏侵染型；开花后20d 的香蕉果实开始带菌，随时间延长，带菌量逐渐增加，以后各个生长阶段的带菌率与降雨量有关；炭疽病菌在果指不同部位的分布存在差异。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。