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second leaf
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  二叶
     But the photosynthesis of flag leaf, second leaf,the Pro content of Aspen are the lowest in several varieties, and respectively reach 9.37μmol·m~(-2)·s~(-1)、6.42μmol·m~(-2)·s~(-1)、4.5%, Aspen is the quite sensitive to moisture content lacks, and the adaptation of drought resistance was bad.
     而Aspen旗叶、倒二叶光合速率,脯胺酸含量在几个品种中最低,分别为9.37μmol·m~(-2)·s~(-1)、6.42μmol·m~(-2)·s~(-1)、4.5%,对水分亏缺比较敏感,抗旱适应性较差。
短句来源
     Increasing one cm width of flag leaf, the grain weight per plant could increase 7.7284 g, and the area of the second leaf was less importance to grain weight per plant.
     进一步回归分析发现,旗叶宽和倒二叶面积对单株粒重的直线回归方程是真实的,旗叶宽度每增加1cm,单株粒重就会增加7.7284g,倒二叶面积每增加1cm2,单株粒重增加0.4146g。
短句来源
     1. There are 54 QTLs were detected in the three population for the SPAD value of the flag leaf and the second leaf, distributed on 17 chromosome intervals of 9 chromosomes except for chromosome 5, 9 and 10. A mass of QTLs were detected at the intervals of chromosome 3, 6 and 8, indicated these intervals were important to the genetic basis in SPAD value.
     1.剑叶、倒二叶SPAD值在三个群体中一共检测到了54个QTLs,分布在除5、9和10之外的9条染色体的17个区间上,第3、6、8染色体的部分区间可以同时检测到多个QTL,说明该染色体区段在叶片SPAD值的遗传中具有重要作用。
短句来源
     The k 21 and k 12 of the first and second leaf from top decreased to 0. 100mg/L Hg 2+ stress caused the k 21 and k 12 of the first leaf from top to decrease significantly.
     1 0 0mg L的Hg2 +胁迫使倒一叶k2 1和k12 大幅度降低 ,50mg L的Hg2 +胁迫也使倒二叶k2 1大幅度降低 ,表明重金属胁迫能影响小麦叶片光合产物在叶内的分配代谢。
短句来源
     The single leaf WUE was studied,the result showed that the second leaf from topis thehighest in all leaf layers,9:00一11:00 is the highest in a day.
     研究单叶水分利用效率表明:顶层第二叶在各叶层中最高; 其日变化是9:00-11:00时单叶WUE最高。
短句来源
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  2叶
     Theideal width of the second leaf under the top leaf is 1.1-1.4 cm for the early crop and about 1.1 cm for the late crop.
     顶下2叶宽:早季1.1~1.4cm、晚季1.1cm左右;
短句来源
     The ideal length of the second leaf under the top leaf is 39-44 cm for the early crop and 37-43 cm for the late crop.
     顶下2叶长:早季39~44cm、晚季37~43cm;
短句来源
     The (results) showed that the change trend of Pn and Tr were (consistent), and the order was flag leaf (FL), the second leaf (Cd2L), the third leaf (Cd3L) and the fourth (Cd4L) leaf from big to small.
     结果表明,小麦叶片的Pn和Tr在花后的变化趋势表现一致,且其大小顺序为旗叶(FL)、倒2叶(Cd2L)、倒3叶(Cd3L)、倒4叶(Cd4L)。
短句来源
     2. Sensitive period for fertility transfer of the Xiangnuoliang 2S ranged from pollen mother cell differentiation to meiosis, morphylogically the stage when the leaf ring of the flag leaf is 0.8cm higher then that of the second leaf from the bottom, i.e., 4-10 days(in autumn) or 3-7 days(insummer) before heading.
     2.“湘糯粱2S”育性转换的温光敏感时期为花粉母细胞形成至减数分裂期,其外形判断为旗叶叶环高出倒2叶叶环0-8厘米,即抽穗前4-10天(秋季)或3-7天(夏季)。
短句来源
     A QTL in marker interval R2510-RM211 on chromosome 2 affected both grain weight per panicle and the second leaf weight, which would be beneficial to super-high-yielding rice improvement.
     第2染色体的R2510-RM211标记区间同时检测到控制单穗重和倒2叶重的QTL,该QTL对超级稻株型育种具有应用价值。
短句来源
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  倒2叶
     The (results) showed that the change trend of Pn and Tr were (consistent), and the order was flag leaf (FL), the second leaf (Cd2L), the third leaf (Cd3L) and the fourth (Cd4L) leaf from big to small.
     结果表明,小麦叶片的Pn和Tr在花后的变化趋势表现一致,且其大小顺序为旗叶(FL)、倒2叶(Cd2L)、倒3叶(Cd3L)、倒4叶(Cd4L)。
短句来源
     2. Sensitive period for fertility transfer of the Xiangnuoliang 2S ranged from pollen mother cell differentiation to meiosis, morphylogically the stage when the leaf ring of the flag leaf is 0.8cm higher then that of the second leaf from the bottom, i.e., 4-10 days(in autumn) or 3-7 days(insummer) before heading.
     2.“湘糯粱2S”育性转换的温光敏感时期为花粉母细胞形成至减数分裂期,其外形判断为旗叶叶环高出倒2叶叶环0-8厘米,即抽穗前4-10天(秋季)或3-7天(夏季)。
短句来源
     A QTL in marker interval R2510-RM211 on chromosome 2 affected both grain weight per panicle and the second leaf weight, which would be beneficial to super-high-yielding rice improvement.
     第2染色体的R2510-RM211标记区间同时检测到控制单穗重和倒2叶重的QTL,该QTL对超级稻株型育种具有应用价值。
短句来源
     Transpiration,stomatal conductance and CO 2 between cells of the second leaf were large.
     蒸腾速率表现为开花期最大 ,单叶以倒 2叶最大。 气孔导度和细胞间隙CO2 浓度以抽穗期值较大 ,倒 2叶值最大。
短句来源
     The results also indicated that a minimized color difference between the fourth and the third leaf from the top at the stages of the critical affective tillering, the emergence of the second leaf from the top and heading is a symbol of high yield, and that plant nitrogen content of 27g·kg -1 DW for japonica rice and of 25 g·kg -1 DW for indica rice are critical nitrogen concentration.
     研究提出在有效分蘖临界叶龄期、倒 2叶出生期和抽穗期顶 4叶与顶 3叶叶色相近为高产水稻的标志 ,粳稻植株含氮量 2 7g·kg-1DW和籼稻植株含氮量 2 5g·kg-1DW可作为水稻氮素丰缺的临界指标。
短句来源
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  “second leaf”译为未确定词的双语例句
     And the highest β-primeverosidase expression is in the second leaf, corresponding to 4.02E+06 copies/μL.
     而β-樱草糖苷酶在第二叶中拷贝数最高,为4.02E+06拷贝/μL,其次分别为:第三叶>第四叶>一芽一叶>第五叶。
     2) decapitating the scion above the 12th or 13th leaf and girdling right above the second leaf from the base could significantly improve the survival ratio; it was even more effective if 0.3% KH2PO4 or ashes were sprayed afterwards.
     抽梢25~30 cm长时留12~13片叶摘心,并于基部第2片叶之上环割,能显著提高嫁接成活率,在摘心、环割的基础上再喷施0.3%KH2PO4或撒草木灰有增效作用,撒草木灰的效果更好一些;
短句来源
     Zhu 1S and the dwarfing mutants SV1S and SV14S were used as the pl an t materials and the response of the activity of α amylase of the endosperm,the second leaf sheath and internodes to exogenous GA3 were analyzed. The results sh owed that the dwarfing variation of SV1S and SV14S derived from Zhu 1S were not due to the gibberellin signal transduction.
     以株-1S、SV1S、SV14S为研究材料,分析这3种材料的胚乳α-淀粉酶活性、第二叶鞘及节间长度对赤霉素(GA3)反应,结果表明来源于株-1S的SV1S、SV14S突变体的矮化变异与赤霉素信号传导途径无明显关系.
短句来源
     (3) The N content per unit leaf area was the highest in the second leaf count backwards, and that of decrepit leaf was about the 1/3 of the normal leaf.
     (3)单位叶面积含N率以倒数第 2展开叶最高 ,衰老叶片只有正常叶片的 1/ 3左右。
短句来源
     50mg/L Hg 2+ stress also caused the k 21 of the second leaf from top to decrease significantly, indicating that Cu 2+ \,Cd 2+ \,Hg 2+ stress might also affect the metabolism and allocation of photosynthate in the leaves of wheat.(3) Cu 2+ \,Hg 2+ and Cd 2+ stress could inhibit the accumulation of photosynthate in roots.
     ( 3 )Cu2 +、Hg2 +和Cd2 +能明显抑制光合产物向根系的积累
短句来源
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  second leaf
The work presented deals with the fact that continuous or periodic distribution of low irradiance significantly reduces the dry weight of coleoptile and second leaf with cell elongation in rice seedlings during the initial period of growth.
      
Combined pathogen infection involved the inoculation of one leaf with Pst DC 3000 and of a second leaf, from the same plant, with Pstb.
      
L-Canavanine inhibited elongation of the second leaf sheath of rice seedlings more than other natural bioactive substances, such as salicylic acid and cinnamic acid.
      
The first leaf had only about 10% and the second leaf only 20% of the area of the fifth leaf.
      
The first leaf layer above a point was defined to be the highest aggregation of the foliage above the point, and the second leaf layer to be the one below.
      
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The leafhopper, Empoasca subrufa Melichar is one of the important insect pests ofrice, wheat, sugarcane, sorghum, etc. in South China. The plants thus damaged willshow numerous white spots on the leaves. The rice seedlings, under serious attack, witherrapidly. While at the later stage of development of rice it reduces the seed weight. The present study, conducted during 1957--1959 in Foochow and Minhou of Fukienprovince, deals with the biology of the insect. Four and sometimes five generations ayear are...

The leafhopper, Empoasca subrufa Melichar is one of the important insect pests ofrice, wheat, sugarcane, sorghum, etc. in South China. The plants thus damaged willshow numerous white spots on the leaves. The rice seedlings, under serious attack, witherrapidly. While at the later stage of development of rice it reduces the seed weight. The present study, conducted during 1957--1959 in Foochow and Minhou of Fukienprovince, deals with the biology of the insect. Four and sometimes five generations ayear are usually found. At the last generation the adults occur in October and Novem-ber in rice field, and after the crop has been harvested, they move to wheat and sugar-cane fields and to other cereal weeds along the sides of streams, pool and ponds wherethey overwinter. During the winter its destructive activity is still going on when theaverage daily temperature is above 11℃. The longevity of the female adults in summeris about 33 days, and the male adults 21 days, whereas that of the last generationadults lasts about 7 months. The duration of the egg stage in different generations variesfrom 5 to 14 days. The nymphal stage in different generations varies from 18--24 days.In summer, the preoviposition stage takes about 15 days. The adult lays its eggs singly in the midrib of the leaf of rice. In the earlier stageof the growth of rice, eggs are laid in the first and second leaves from the base, whileat the later stage, eggs are found mostly in the third leaf. In day time it rests uponthe upper and the middle parts of the crop. It moves higher toward the morning andevening. At mid-day it goes downward. It begins to appear in the rice field in March and then multiplies rapidly in May orJune. The population, decreasing during July and August, rises again in September. Theraining season in spring favors its growth and multiplication. In the control of this leafhopper, it is advisable to use: 1) 25% DDT emulsionmixed with wettable 6% γ BHC in 1:1:500, 2) a mixed powder of 5% DDT and0.5% γ BHC in 1:1 concentration, 3) an emulsion of 25% DDT in 1:300--400 partsof water, and 4) a powder of 2.5--5% DDT. Besides, based upon the study of its lifehistory and habits, clearing of weeds in winter before the wheat emerges is also con-sidered effective.

白翅叶蝉是福建省水稻的重要害虫,苗期受害严重者,整片稻苗苍白,甚至枯死;早稻孕穗、抽穗期常大量发生为害,影响谷粒饱满度,造成减产。福州和闽侯地区一年发生4代,部分5代。成虫越冬。冬季日平均温度达11℃以上时仍能取食为害。春季成虫侵入稻田,4月下旬前后大量产卵,5月中旬虫数激增,5月下旬或6月初达到高峰。早稻收割时由于农事活动引致若虫大量死亡。晚稻田于8、9月虫数较多,但危害不如早稻严重。10月中旬以后成虫逐渐离开稻田,迁往越冬场所。 寄主植物幼嫩茂密和较大湿度的小生境有利于白翅叶蝉的发育繁殖。大发生的气候因子主要是春季多雨。适宜的温湿度范围为温度20—25℃,相对湿度85—90%。 DDT单独使用或DDT与666混用防治白翅叶蝉都能收到满意的效果。早稻秧田宜在播种后两周施药防治;本田于5月中旬虫口密度开始增长之际施药,亦能抑制为害。冬季小麦出土以前清除田边杂草,也是一项有效的防治措施。

Forty five chemically induced polyploid Hevea plants were obtained from the budwoods of the best clones Hal Ken 3, SCATC 2-14-39 and SCATC 7-18-55. According to cytological identification, the number of chromosome in most somatic cells of these polyploid trees was 2n=45~72. Polyploid cells of each plant account for more than 60% of its total number of divided cells. A series of morphological variations occurred in these plants, for example, the mesophyll and the lateral veins became markedly thicker and the...

Forty five chemically induced polyploid Hevea plants were obtained from the budwoods of the best clones Hal Ken 3, SCATC 2-14-39 and SCATC 7-18-55. According to cytological identification, the number of chromosome in most somatic cells of these polyploid trees was 2n=45~72. Polyploid cells of each plant account for more than 60% of its total number of divided cells. A series of morphological variations occurred in these plants, for example, the mesophyll and the lateral veins became markedly thicker and the leaves dark green. The 'screening of these trees has been made up to their second or third generation. Of these polyploid trees, the biggest one is about two meters high and has produced several polyploid branches now. When colchicine+kinetin were used as mutagens, most of the first leaf stories from the treated buds were mosaics but almost all the second leaf stories became dipliods (2n=36) again. Therefore, we selected the stems of the first leaf stories with marked polyploidy variations for isolating and screening in the first asexual generation. The mutant buds obtained from this generation represent about 0.1%. It was found that only when these mutant buds continued to be budded up to the second generation for screening, could more polyploid plants be obtained. But in this generation, segregation still occurred because about 30% of normal plants were observed. After cytological identification and selection of good individual polyploid plants from the second generation for further screening, almost all plants obtained from the third generation were polyploids.

本文报道从海垦8,热研2—14—39,热研7—18—65等优良无性系芽条诱导出45株多倍体植株,经细胞学鉴定,这些植株的体细胞染色体数大多为2n=54~72,每个植株的多倍细胞均占其总分裂细胞数的60%以上。这些多倍体植株的外部形态发生了显著的变异,如叶片显著增厚、叶色浓绿、叶脉增粗等。目前这些植株已进入无性系第2代和第3代筛选,其中最大的多倍体植株已高达2米,而且已开始出现多倍分枝。在试验研究过程中,我们发现采用秋水仙碱和激动素等诱导剂时,诱导当代芽条的第一蓬叶大多数属于嵌合体。至第二蓬叶时则几乎全部恢复正常(2n=36)。将当代第一蓬叶的嵌合体茎干进入无性第一代分离筛选时,约产生千分之一的突变芽,只有将这些突变芽继续芽接至第二代筛选时才能获得较多的多倍体植株,但这一代仍然有分离现象。分离出正常的植株约占30%。从无性第二代中再经细胞学鉴定,选出较纯的多倍体植株进行无性第三代筛选时,所获得的第三代植株几乎全部属于多倍体植株。

1. By means of Tuan's cell separation technique and paraffin sectioning, mesophyll cells of the first leaf layer, the second leaf layer and the third leaf layer were investigated. These mesophyll cells were selected from 3 species of Saccharum and 3 varieties of sugarcane, namely, Saccharum spontaneurn, S. robustum, S. officinarum, Nco. 310, Minxuan 703, Mintang 611. 2. The mesophyll cells of sugarcane are also differentiated into parks, dales, isthmus, and links. 3. The mesophyll cells of Saccharum...

1. By means of Tuan's cell separation technique and paraffin sectioning, mesophyll cells of the first leaf layer, the second leaf layer and the third leaf layer were investigated. These mesophyll cells were selected from 3 species of Saccharum and 3 varieties of sugarcane, namely, Saccharum spontaneurn, S. robustum, S. officinarum, Nco. 310, Minxuan 703, Mintang 611. 2. The mesophyll cells of sugarcane are also differentiated into parks, dales, isthmus, and links. 3. The mesophyll cells of Saccharum are of varies types, many of them have the shape of "W" "(?)" comb and chain, etc. 4. The mesophyll cells of Minxuan 703, Nco. 310, Mintang 611 are larger than those of S. officinarum and S. robustum. 5. The numbers of chloroplasts of Minxuan 703, Nco. 310, Mintang 611 are larger than those of S. officinarum and S. robustum. 6. Chloroplasts of different cell-types may vary in shapes.

应用细胞分离制片法,配合石蜡切片和显微测量,对在我院试验田种植的刈手密野生种、伊里安野生种、热带种和纳印310、闽选703、闽糖611等种和品种的不同叶层,进行了叶片细胞学比较观察,结果发现甘蔗叶肉细胞绝大多数分化成为具有峰、谷、腰、环的复式细胞。叶肉细胞本身以宽轴和叶片纵轴平行,有规律地排列于叶片内。叶肉细胞和叶绿体的形态是多种多样的,其细胞大小、总宽度、厚度、峰宽、谷深、峰间距和叶绿体的大小、数量是随不同种(品种)和不同叶层而异。这种变化是沿着系统演进的顺序和细胞形态建成时的光、温条件不同而有规律地变动(即沿着提高光合膜面积的方向转化)。本文最后讨论这种形态变化的合理性及其实践意义。甘蔗是高产的糖料作物,福建是主要产区之一。其产量是随着不同地区和栽培条件而不同,或在相同地区和同样栽培条件下随着不同种(品种)而有明显的差异。为选育优良品种而提供形态学指标,对甘蔗叶片光合膜面积的比较研究显得十分必要。根据已看到的资料,有关甘蔗营养器官的解剖6,组织培养,甘蔗叶绿体的超微结构,甘蔗二型叶绿体的发育,以及甘蔗叶片的光合作用等方面的研究巳做了大量工作,也积累了不少资料,但有关甘蔗叶片光合膜面积比较,特别是从系统和个...

应用细胞分离制片法,配合石蜡切片和显微测量,对在我院试验田种植的刈手密野生种、伊里安野生种、热带种和纳印310、闽选703、闽糖611等种和品种的不同叶层,进行了叶片细胞学比较观察,结果发现甘蔗叶肉细胞绝大多数分化成为具有峰、谷、腰、环的复式细胞。叶肉细胞本身以宽轴和叶片纵轴平行,有规律地排列于叶片内。叶肉细胞和叶绿体的形态是多种多样的,其细胞大小、总宽度、厚度、峰宽、谷深、峰间距和叶绿体的大小、数量是随不同种(品种)和不同叶层而异。这种变化是沿着系统演进的顺序和细胞形态建成时的光、温条件不同而有规律地变动(即沿着提高光合膜面积的方向转化)。本文最后讨论这种形态变化的合理性及其实践意义。甘蔗是高产的糖料作物,福建是主要产区之一。其产量是随着不同地区和栽培条件而不同,或在相同地区和同样栽培条件下随着不同种(品种)而有明显的差异。为选育优良品种而提供形态学指标,对甘蔗叶片光合膜面积的比较研究显得十分必要。根据已看到的资料,有关甘蔗营养器官的解剖6,组织培养,甘蔗叶绿体的超微结构,甘蔗二型叶绿体的发育,以及甘蔗叶片的光合作用等方面的研究巳做了大量工作,也积累了不少资料,但有关甘蔗叶片光合膜面积比较,特别是从系统和个体发育观点对甘蔗叶肉细胞形态学的比较研究,在文献上尚未看到。作者于1979年9月开始对刈手密野生种(Saccharum spontaneum)、伊里安野生种(S.robustum)和古老栽培种:热带种(S.officinarum)以及经有性杂交育成的商品性品种:纳印310、闽选703、闽糖611的叶肉细胞进行系统的比较研究。现将第1至3叶层的甘蔗叶肉细胞形态报告如下。

 
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