气孔

Under SEM, the cuticula membrane of the leaf epidermis is distinct, and granular, reticulate, scaly or papilliform in shape. The stomatal apparatus is of paracytic type and occurs only on the lower surface.

气孔器几乎全部生在下表皮，有些种气孔下陷，气孔器一般是一对保卫细胞和一对副卫细胞平列。

On the basis of two criteria of stomatal limitation of photosynthesis suggested by Farquhar and Sharkey,the re-dominant limiting factor of photosynthesis is stomatal conductance of stomatal limitation in the forenoon,but the midday depression of photosynthesis at noon and the decrease of photosynthesis in the afternoon are the results of low carboxylation efficiency of the mesophyll leaf.

根据Farquhar和Sharkey的观点，造成净光合速率下降的原因既有气孔限制又有非气孔限制因素，上午净光合速率下降的主要是由气孔限制因素造成的，午间和下午光合速率的降低则主要归因于叶肉细胞羧化效率的降低。

The results showed that the cluster analysis indicated that ploidy was highly correlated to the number of chloroplast in guard cell and the length of stomata.

结果表明，叶绿体数目和气孔长鉴定倍性的可靠性较高，其中，苹果气孔长误判率最低，为6.67 ％；梨气孔保卫细胞叶绿体数目误判率最低，为12.5 ％。

Strength of SPBT was numerically explained on the base of Perdersen discharge model of ellipsoid void, and the conclusion was got that the discharge strength of void was an inverse measure of the cosine of oriented angle of void.

本文首次利用Perdersen的棉球气孔放电模型，定量解释了SPBT瓷体局部放电起始场强的大小，并得到瓷体中气孔发生放电的外施场强与此气孔取向角余弦成反比的结论。

The model expanded the existing models simulating stomatal responses to environmental water status by incorporating the knowledge about the mechanisms of the action of radiation and temperature, and the interaction between them In this model, moreover, a representation of stomatal conductance as a function of stomatal geometry is used, where the water potential gradient within the leaf has been taken into account.

在不同环境因子的组合下模拟得到的结果与公认的实验观测基本一致。它可以作为研究气孔整体行为的理论框架，也可用于检验气孔运动的基本假设。第四章对Ball和Berry提出的气孔经验模型进行了分析和模拟检验。

The photosynthetic rate decreasing of un-pretreated was not caused by plant spiracle.Thephotosynthetic rate decreasing of the pretreated plant was caused by plant spiracle in the first andsecond low temperature stress day,The photosynthetic rate decreasing of the pretreated plant wascaused by other factors in the third and fourth day.

在胁迫过程对照植株光合速率的下降是由非气孔因素引起；锻炼植株光合速率的下降在胁迫的前两天是由气孔因素引起，在胁迫的第三和第四天是由非气孔因素引起。

Pometia tomentosa and Barringtonia pendula had higher stomatal densit...

随光强的增大，气孔密度和气孔指数增大，单位叶气孔数在低光强下较大。

The results show:the above two species of Flos lonicerae's palisade parenchyma are composed of 1 layer of cylindrical cells.But in karst areas variety palisade parenchyma is cylindrical cells .Palisade and spongy tissue have distinctly differentiation.,are both bifacial leaf.

研究结果表明：以上2种金银花栅栏组织的层数均为一层，有栅栏组织和海绵组织的分化，均为异面叶；但岩溶地区的栅栏细胞为圆柱形，非岩溶地区的栅栏细胞为长柱形；岩溶地区品种的上下表皮细胞明显比非岩溶地区的品种大，并且其栅栏组织和海绵组织的排列较非岩溶地区品种紧密；气孔都仅分布在下表皮，气孔类型为肾形，岩溶地区气孔密度大。

The six species of Coniogramme are different in the size of cell of leaf epidermis, the size of stomatal, Stomatao density and Stomatal index.

但6种凤丫蕨属植物在表皮细胞大小、气孔大小、气孔密度和气孔指数上存在一定的差异。

Plasma membrane infolding occurred after pretreatment and low temperature stress, one new structure looked like vacuole was recognized between plasma membrane and cytoderm, the emergence of that phenomena maybe concern with plasma membrane infolding and vacuole.

在胁迫过程对照植株光合速率的下降是由非气孔因素引起；锻炼植株光合速率的下降在胁迫的前两天是由气孔因素引起，在胁迫的第三和第四天是由非气孔因素引起。这也从另一个角度证明了低温锻炼提高了植物的抗寒性。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。