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In breeding and cultivating high yield C. pepo in sunlit greenhouse, emphasis should be placed on the construction of plant type with over 12 functional leaves, average leaf area of 700~800 cm2, average internode length of approximately 3.3 cm and upper leaf angle of 45°~66°.

在日光温室高产西葫芦育种和栽培中，要注重构建功能叶片数达12片以上、平均叶面积达700~800 cm2、节间长平均在3.3 cm左右、上层叶倾角在45°~66°之间的株型，以获得较高产量。

Effects of tillage systems and nitrogen applied amount on wheat growth and development and yield of wheat and maize 3.1 Effects of tillage systems and nitrogen applied amount on wheat growth and development In the second year of experiment, there was no significant difference in the wheat flag leaf photosynthesis rate, flag leaf senescence characteristics, photosynthate transferring amount, photosynthate transferring ratio and dry matter accumulation of between R, H and C.

3耕作模式与施氮量对小麦、玉米生长发育及产量的影响 3.1耕作模式与施氮量对小麦生长发育的影响在试验第二年，旋耕和耙耕模式在旗叶光合速率、旗叶衰老特性和光合产物转移量和转移率，以及干物质积累量上与常规耕作模式无显著差异。

Arsenic in pinnate leaf tended to translocate to the tip of leaf, where higher arsenic content was found in this study.

SRXRF高灵敏度的特点，使得我们在研究的所有样品中均可以得到植物体内大部分元素微区分布的完整信息。

There were high positive correlations between activity of root and photosynthetic rate of flag leaf, ZRs content and activity in root, ZRs content and photosynthetic rate in flag leaf respectively.

根系活力的下降速度和叶片的叶绿素下降速度相比，根系活力的下降大于叶绿素的下降，根系活力的衰退先于叶片的功能衰退。

The spore germination and gametophyte development of 21 ferns are studied. It indicates that :① the development period of prothallium and young sporophyte of the same species is different due to seeding time of spores;② the optimal temperatures of spores germination and gametophyte development of 21 ferns are about 15 -24 ℃;③ the rate of spore germination of rare ferns is much lower than the ferns which occur large populations in nature;④ the treatment with GA 3 can accelerate the germination of the spores;⑤ the prothallium changes from large to small, green to yellow when young sporophyte comes out. The prothalliums of all 21 ferns die away after the appear of the 3rd leaf of sporophytes;⑥ shapes of the 1st and 2nd leaves of the young sporophyte are different from those emerged later;⑦ spores cultured in dark can not germinate;⑧ a prothallium can develop only one young sporophyte though it has many archegoniums, and the spore propagation with leaf mould substrate is an economical method.

摘 要：以腐叶土为培养基质，对 21 种蕨类植物进行了孢子萌发和原叶体发育的研究，结果表明：①不同时期播种的同种蕨类的孢子，发育出原叶体和幼孢子体所历经的时间长短不同；②孢子萌发和配子体生长发育的适宜温度约为 15 ～ 24 ℃；③稀有蕨类的孢子萌发率低，而在野外能形成较大种群的蕨类的孢子萌发率高；④用 GA 3 处理孢子可以促进萌发；⑤当原叶体上长出幼孢子体时，原叶体由大变小，由绿变黄， 21 种蕨类的原叶体都在幼孢子体上长出第 3 片叶时消失；⑥幼孢子体上长出的第 1 、 2 片叶在形态上与以后长出的叶不同；⑦孢子萌发需要光；⑧ 1 片原叶体尽管有多个颈卵器，但仅发育出 1 株幼孢子体；⑨利用腐叶土进行蕨类孢子繁殖是一种经济实用的繁殖方法。

Significant selection effects of leaf blade pubescence status on resistance to bean pyralid were found in R1-R6 stages. It indicated that the pubescence status on leaf blade can be used as an indirect indicator for the resistance to bean pyralid in marker-assisted selection breeding.

在大豆生长的R1-R6期，两群体中叶片茸毛着生状态都有明显的选择效应，因而大豆叶片茸毛着生状态可作为豆卷叶螟抗性的指示性状，用于抗豆卷叶螟的标记辅助选择育种。

Wheat leaf rust, caused by Puccinia triticina, is one of the most important wheat diseases in the world. The leaf rust fungus is adapted to different climates, the disease can be found in diverse wheat growing areas throughout the world.

由小麦叶锈菌引起的小麦叶锈病是小麦生产上的主要病害之一，适宜范围广，发生区域大，严重发生时可造成5%—15%甚至更高的产量损失。

Results showed that spraying KCl solution every other day for 15 days from late flowering decreased nitrate content in the leaf and stem, promoted nitrogen redistributed to silique, increased nitrate reductase activity in the leaf. After spraying 1% KCl solution does not affect the fresh weight of rapeseed. And more obvious differences between the species, different varieties of the same deal with the differences between the more significant.

结果表明，喷施氯化钾溶液能有效降低油菜茎叶硝酸盐含量，与喷施硫酸钾溶液和清水相比达到了显著水平；有效促进了氮素向角果分配；喷施氯化钾还可以增强叶片硝酸还原酶的活性，但不影响喷洒后采样时油菜总的鲜质量；而且品种之间处理后的差异比较明显，同一品种不同处理之间的差异也比较显著。

Leaf epidermis of 35 species of Ormosia in China was examined under light microscope andscanning electron microscope. The epidermal cells of both upper and lower leaf surfaces are polygonal or irregular in shape, anticlinal walls are straight, arched, sinuolate or sinuate, and stomata are elliptic or ovate.

用光学显微镜和扫描电子显微镜观察了红豆属35种的叶表皮形态，这些植物的叶上下表皮细胞为不规则形或多边形，垂周壁有平直、弓形、浅波状或深波状，表皮细胞形状和垂周壁在种间有一些差异。

The damage caused by Cl in strawberry was less than that of Na~+ and Ca~+ far away.3.Membrane damage in root and leaf of strawberry was relief by Ca(NO_3)_2,CaCl_2 and Ca_2 treatment under NaCl stress, while leaf holding ability and chlorophyll content was enhanced, growth was improved and the biomass increased.

低浓度Ca(NO_3)_2、CaCl_2和Ca_2作为外源钙均能减轻NaCl胁迫对草莓成株根系和叶片的膜伤害，提高叶片保水力和叶绿素含量，改善草莓的生长状况，提高生物产量。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。