The stimulation of the he - ne laser irradiation effect on the vigor was clearer than the growth potential of germination and germination capacity . it indicated that the stimulation effect was expressed in early phase clearly 激光对uv - b处理后小麦幼苗发芽势、发芽率的促进作用大于生长势，说明这种促进作用在萌发早期表现的较为明显。
Mid - early matured variety , cylindrical shape with shiny pink skin , 30 - 40 cm in length , 5 - 8 cm in diameter , excellent fruit - setting , vigorous growth , suitable for growing in protected facilities and open field 中早熟、丰产、抗病长茄一代杂交种。植株生长势强，果实长棒形、果长30 - 40厘米、果实横茎5 - 8厘米、果皮亮紫红色、有光泽，商品性极好。适宜保护地及露地栽培，可在我国南北方种植。
Through the studies on the anatomical configuration of eight different interstocks apple ( red fuji ) branches using microscope and vernier caliper , we can show that the pith proportion was positive correlative with the growth potential of apple tree if they have close kin 摘要采用番红固绿染色法并结合使用显微镜和游标卡尺，分别对8种不同中间砧的红富士苹果枝条解剖结构进行了研究，结果表明：亲缘关系较近的品系，髓部面积与树体的生长势呈正相关。
Put the transgemc seedlings and controls together at low - temperature ranged from 5 - 15 for at least 3 weeks , and then determine their physiology indexes : 1 : the growth of seedlings : at low - temperature , the growth potential of the transgenic seedlings was drastically higher than the controls and the height changed more distinctness in transgenic plants than in the controls 生长量：在低温处理期植物株高变化对比显著，转基因苗的生长势明显高于对照，株高变化明显，对照的生长缓慢，株高变化不明显。
Effects of diverse environmental factors on the growth rate ( od4oo ) and nitrogenase activity ( ara ) of the strain w12 hi nitrogen - free culture were investigated in our experiments . the results implied that the strain w12 could easily adapt to different cultural conditions : it could use various carbon sources ( especially glucose , sucrose , malic acid , mannitol ) , propagate quickly and fix nitrogen at a temperature range of 15 ? to 40 ? and at 25 - 35 ? for optimum , at a ph range of 4 to 8 . 5 , at a saline concentration range of 0 . 01 % to 1 . 5 % ; low nlv " concentration had little effect on its nitrogenase activity . ara could also be detected when it grow in the culture media with 5mmol / l ntv " W12菌株对环境因子的适应性研究：无氮培养条件下，测定温度、碳源、酸碱度、渗透压对w12生长及固氮能力的影响，结果表明，在15 - 40下均能生长并表达固氮酶活性，其最适生长及固氮的温度为25 - 35 ；能利用葡萄糖、蔗糖、苹果酸、甘露醇等多种碳源生长并固氮，当培养基中同时存在蔗糖和苹果酸时，细菌生长和固氮活性最强；在偏酸和偏碱的条件下( ph4 . 5 - 8 . 5 )均能保持较强的生长势和较高的固氮酶活性，并能通过调节自身代谢平衡并适应环境的酸、碱性变化，使培养液趋于中性：能耐受较高的渗透压，培养液中卜、 5 naci浓度对其生长和固氮酶活性影响不大，当naci浓度升至2时，菌株的生长势及固氮酶活性才有所下降：低浓度的铰对其固氮酶活性影响不大，在0
It has been 40 years since dobereiner and ruschel isolated the nitrogen - fixing bacteria from the rhizosphere of sugarcance plants and demonstrated the potential of diazotrophs to associate with graminaceous plants . more recent evidence of significant biological nitrogen fixation in economical important graminous species , particularly sugar cane , rice and forage grasses , has induced tremendous interest in ni fixation by non - legumes 本研究分离、筛选得到一株固氮酶活性高且稳定，生长势强的联合固氮菌株，并对其分类地位、形态及生理特征、对环境的适应性及其对植物的促生效果和作用机理作了系统研究，得结果如下。
Studies have been made shown that under water stress , not only root weight , root specific surface area , root - shoot ratio , root growing potential , root water potential , root vessel diameter , etc which express the indexes of wheat root morphology and architecture have significantly changed , but also bleeding sap , root respiratory rate , root plasma membrane permeability , plasmalemma peroxide level , root protective enzymes and its isoenzymes etc which express root physiological indexes have changed correspondingly 过去进行的研究表明，干旱胁迫条件下，不仅表达小麦根系形态和构型建成指标的根系数量、根系比表面积、根冠比、根生长势、根水势、根导管直径等发生显著变化，而且表达根系生理指标的伤流液、根呼吸速率、根系质膜透性、膜脂过氧化水平、保护酶及其同工酶等也发生相应改变。
The genomics dna of the transformants was extracted and assayed by pcr with nptii primer camv35 / cp primer and the results indicated that the chloroplast shsp gene has been integrated into the genomics of the tomato . then the transgenic tomato were exposed to low temperature ( in winter , on natural condition , the top temperature was 15 ? and the lowest temperature was 5 and a set of physiology parameters were measured after 6 weeks . the results were shown as follows : 1 ) effect on growth height of the transgenic tomato and the control plants after 6 weeks at low temperature showed that the transformants had been grown faster than the control . in addition , the leaves of the control plants appeared to be much reder than the transgenic tomato , and the change were obvious followed by far from the treated time at low temperature , which suggested that the constituently expression of the chloroplast shsp had some protective fountions to the tomato at low temperature 提取转基因番茄基因组dna ，分别以npt和35s cp引物对其进行pcr分析，结果表明叶绿体shsp基因已整合进番茄基因组中；对转基因番茄进行低温处理(冬季，自然条件下(无加热的温室) ，白天最高温度15 ，夜间最低温度5 ) ，生长6周后，检测转基因番茄的系列生理指标，主要结果如下： 1 )生长势：测量转基因番茄与对照(未转基因番茄)的株高，结果显示转基因植株生长明显快于对照，且从外观上看到对照叶片发红程度远大于转基因植株，随着低温时间延长，对比更加明显，说明叶绿体shsp的组成性表达在低温下对番茄具有一定的保护作用。
The materials as explant in transformation come from birch leaf , stem segment and leaf stalk , and the spider toxin gene was used as foreign gene for this transformation experiment . it showed that the best explant was the big leaf , on which the transformation frequency was 22 % . by gus detection , there were 43 percent of the plants with kanamycin resistance , and 100 percent of positive result , by pcr amplification , was gotten from random sampling 利用双元载体的根癌农杆菌lba4404菌株( agrobacteriumtumefaciens ) ，含质粒pyhy (目的基因及npt 、 gus基因) ，对白桦试管苗茎段，叶柄，叶片三种外植体进行侵染，结果表明：大叶片生长势强，为转基因的最优外植体，转化率能够达到22 。
