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And the development and formation of the sieve tube elements of the different cultivars were influenced by the different levels of B: the sieve tube elements of the two cultivars were not formed at the level of 0.001mg/L; At the level of 0.01mg/L, the sieve tube elements of the high efficiency (Qingyou 10) cultivar could be formed, but the structure of the sieve tube elements was not complete, and the abruption and differenciation of the sieve tube elements of the low efficiency cultivar were inhibited, they were not formed; At the level of 0.01mg/L, the sieve tube elements of the two cultivars were formed.

不同硼水平下，不同硼效率甘蓝型油菜品种根尖筛管分子的发育与形成受到影响：硼浓度为0.001mg／L时，两个油菜品种都不能形成筛管分子；硼浓度为0.01mg／L时，硼高效品种青油10号筛管分子可以形成，但结构受到破坏，而硼低效品种Bakow筛管分子的分裂与分化受阻，几乎不可能形成成熟的筛管分子；硼浓度为0.5 mg／L时，两个油菜品种都能正常生长发育。

Northwest Rockii tree peony cultivar group is one of the major tree peony cultivar groups in China.

紫斑牡丹品种群是中国的主要牡丹品种群之一。

To investigate the relationships between the tolerance difference to high temperature stress and superoxide dismutases in different cultivars of Celosia cristata, ten-leaf stage seedlings of the heat-tolerant cultivar, Century Green and the heat-sensitive cultivar, Century copper were pulsed for 48 h with diethyldithiocarbamate pretreatment and subjected to high temperature stress under controlled conditions of relative humidity of 75%~90%, 12 h/24 h photoperiod with 1 500 lx and 45 ℃, to research the changes of external morphology and interior physiology.

李永红；魏玉香深圳职业技术学院应用化学与生物技术学院，深圳 518055摘要为研究鸡冠花品种间耐热差异与超氧化物歧化酶之间的关联，选用鸡冠花耐热品种世纪绿叶和热敏品种世纪铜叶的10叶期幼苗为试材，用二乙基二硫代氨基甲酸钠进行48 h预处理之后，在45 ℃、相对湿度75%~90%，、光照1 500 1x (12 h/d)条件下进行热胁迫处理，研究其形态和生理生化的变化。

As to'Cabemet Sauvignon'and'Queen of Vineyard', which belong to the'West Europe Cultivars Group', no obvious decline of Fv/Fm was found in their potted plants even under severe drought stress. Their photosynthetic abilities also greatly recovered after rewatering, i. e. no serious photodamage was formed in these cultivars under drought stress. Between them, the φPSⅡ of 'Queen of Vineyard'under severe drought stress was much lower than that of'Cabernet Sauvignon', which suggested that the light use efficiency of the former was much lower than the latter under severe drought stress. The potted plants of'Autumn Royal'and'Rizamat' sustained high Fv/Fm and φPSⅡ before moderate drought stress, but seriously declined under severe drought stress, which indicated that these cultivars had a weak resistant ability to extreme drought stress. A hybridized cultivar of Vitis vinifera L. and V. labrusca L.,'Red Double Taste', its Fv/Fm and φPSⅡ expressed mild decline along drought stress grade.φPSⅡ of'Red Double Taste'was the highest among seven cultivars under severe drought stress condition, which might closely connected with its high photorespiration activity. Another new cultivar,'Red Globe', and a rootstock,'1103Paulsen', the Fv/Fm and φPSⅡ of their potted plants declined markedly under slight drought stress, which suggested that they held a weak ability to defend against photoinhibition.

西欧品种群的赤霞珠和葡萄园皇后，其盆栽苗的Fv／Fm直到重度干旱胁迫下仍没有明显的降低，且复水后光合能力恢复程度较高，即干旱没有给这两个品种造成严重的光破坏，而两个品种之间，葡萄园皇后在重度干旱胁迫下的φPSⅡ明显低于赤霞珠，说明其光合器官在严重干旱胁迫时对光能的利用率较差；新品种皇家秋天和东方品种群的里扎马特在中度干旱胁迫下仍可维持较高的Fv／Fm和φPSⅡ，但在重度干旱胁迫下则降低幅度较大，说明其抵御极端干旱胁迫的能力较差；欧美杂种红双味的Fv／Fm和φPSⅡ随着干旱胁迫程度的增加呈现平缓的下降趋势，而且其φPSⅡ在重度干旱胁迫下是七个品种中最高的，这应该与其此时仍维持较强的光呼吸活性有关；红地球和砧木1103Paulsen的Fv／Fm和φPSⅡ在轻度干旱胁迫下就明显下降，表明干旱条件下其抵御光抑制的能力较差。

But when we examined the structure of cultivar of D. huoshanense, endomycorhiza was founded unexpectedly. And in the wild type of D. huoshanense, fungi was also founded in its stems and leaves. So the author thought that endomycorhiza is not only located in the roots of Dendiobium plants, but also exists in other organs of plants, including stems, leaves. As plant produces seeds, mycorhiza could enter into the cells of seeds. When mature seeds germinate in media, the endomycorhiza enter into the roots of cultivar.

石斛属植物与真菌共生，根为菌根，作者在研究霍山石斛组织培养型结构时发现，组织培养苗的根部也分布有真菌，而且在野生霍山石斛的茎、叶中发现有真菌，作者因而指出，真菌并不是完全分布在根部，而是遍布于整个植物体，推测植物形成种子时，真菌进入种子，所以在组织培养时，真菌随着种子的萌发，进入植物体根部。

Application of EBR induced parthenocarpic growth accompanied with active cell division in Jinchun No.4, a cultivar without parthenocarpic capacity, whereas Brz treatment inhibited fruit set and subsequently fruit growth in Jinchun No.2, a cultivar with natural parthenocarpic capacity, and this inhibitory effect could be rescued by application of EBR.

在非单性结实的津春4号黄瓜栽培品种的子房上添加EBR可以诱导单性结实并且提高细胞分裂能力，而在单性结实的津春2号黄瓜栽培品种的子房上喷施BRs合成抑制剂抑制果实生长，最终导致败育，而这种抑制现象可以通过添加EBR得以恢复。

Histologically,the activity of cell division in scutellar epithelium and callus cluster derived from it was higher in cultivar Aikoku than Moritawase.Moreover different types of differentiation in the epithelial callus were observed,the rootlike structures and globular cell clusters with epidermislike structure were found in the calli of cultivar Moritawase and Aikoku respectively.

组织学的观察表明，Aikoku的种胚盾片上皮组织以及由上皮细胞起源的愈伤组织的细胞分裂活性高于Moritawase；而且在上述2个品种中还观察到不同的细胞分化类型，在Aikoku的愈伤组织中观察到了带有表皮状结构的圆形细胞块，而在Moritawase的愈伤组织中却观察到了根状结构。

N our collected germplasm, cultivar Qushichixiaodou must not be member of Vigna unguiculata, maybe it was more reasonable that cultivar Qushichixiaodou belong to Vigna umbellata based on ITS sequence data.

TS序列分析结果表明所收集的品种资源中去湿赤小豆不应该划入豇豆种，划入赤小豆种(V.umbellata)可能更为合适。

Using a single-harvested cultivar "Jiangshujiao" and a double-harvested cultivar "Fenghongzao" of Zizania latifolia as tested materials, the effects of organic fertilizer and inorganic fertilizer on the binding capacity of different size of Z. latifolia fleshy stem to Cd(superscript 2+) and Pb(superscript 2+).

方法］以茭白单季茭品种&蒋墅茭&和双季茭品种&葑红早&为试验材料，研究了有机肥和无机肥处理的不同规格茭白肉质茎对重金属离子Pb(上标 2+)和Cd(上标 2+)束缚能力的影响。

Compared with cultivar Bing-9652 in the low Se treatment, cultivar Xiushui-48 in the high Se treatment was high in capacity of accumulating and translocating Se.

在水稻苗期，秀水48较高的Se吸收量是由于其根系对亚硒酸盐吸收能力较高。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷