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Pollens of Zhouxingshantao peach trees, apricot cultivar Katy and plum cultivar Friar were irradiated by different doses of 60γ-rays and ultraviolet to study the radiation effect on the pollen germination and distant hybridization settings.

本文研究了不同剂量的60Co γ射线和紫外线辐照对帚型山桃、凯特杏、黑宝石李3种果树花粉后其发芽率及远缘杂交坐果率的影响。

Lintao-1, a new extra early peach cultivar, is a bud mutation of Beijing-2 peach cultivar.

临桃一号由北京二号芽变选育而来，是一个集极早熟与优质于一体的鲜食桃新品种。

The progress levels of symptoms after pathogen infection showed that interaction of gray leaf spot pathogen and host has differentiation or polymorphism. The progress levels of symptoms is different.The aggressively has polymorphism. The pathogenicity of different isolates in same cultivar has polymorphism, or the host reaction type of same isolate in different cultivars has polymorphism.The host reaction type has differentiation. There are seven types of host reaction in cultivar and inbred after infected by GLS pathogen:Rectangular lesion without chlorotic halo, Rectangular lesion with chlorotic halo,Irregular lesion without chlorotic halo,Irregular lesion with chlorotic halo, Spot lesion with chlorotic halo,Rectangular and irregular lesionand Rectangular and spot lesion. The host reaction type is coalesced lesion when disease severely. Frequency of each reaction types is different.

通过对玉米灰斑病菌侵染后的显症过程的系统观察，可在组织水平上说明该病菌与寄主互作反应存在分化或多样性：玉米灰斑病菌不同菌株侵染后显症过程表现出明显的差异；玉米灰斑病菌在侵袭力上存在多样性，菌株间对同一种品种的致病性表现多样化，或者同一菌株对不同品种侵染引起的寄主反应表现为多样性；病斑反应型的分化，玉米灰斑病菌侵染玉米品种或自交系后，主要有7种病斑反应类型，即RH型、RN型、IRH型(不规则形具褪绿晕圈病斑)、IRN型(不规则形无褪绿晕圈病斑)、SH型、RI型(长矩形与不规则形混合病斑)和RS型(长矩形与斑点形混合病斑)，若发病严重，病斑连成片，而且这些反应类型出现的频率也不同。

The results showed that the carrot of different genotypes responded differently with the plant growth regulators. There was no significant difference on the three kinds of callus inducing medium for cultivar Linfeng. In contrast, the rate of embryogenic callus and the number of resistant plants in cultivar Japanese black filed five inch was raised with increasing plant growth regulator concentration.

结果显示：不同基因型胡萝卜的分化对激素浓度的反应不同，林丰改良五寸参在3种培养基上的胚性愈伤率差异不显著；日本新黑田五寸参胚性愈伤率和每个外植体分化的抗性株数随激素浓度的提高而呈上升趋势，2，4-D和6-BA浓度为1.0mg/L时胚性愈伤率和每个外植体分化的抗性株数最高，分别为87.50%和59株；日本新黑田五寸参以bar基因为标记基因、PPT作筛选剂时，分化较好。

These results suggest that effect of photoperiod on process and numbers of flower bud differentiation may be related to plant biomass and photosynthetic characteristics in one-crop cultivar and two-crop cultivar of Iris germanca.

这些结果明确了光周期对德国鸢尾一二次花品种花芽分化时期和数量的影响与其对植株生物量以及光合特性的影响有关。

A significant positive correlation was obtained between flower bud differentiation and leaf area, or leaf dry weight, or the ratio of dry weight of the above-ground biomass to that of the underground parts of one-crop cultivar and two-crop cultivar.

一二次花品种的花芽分化与叶面积、叶干重和地上部分与地下部分的干重比值呈显著的正相关。

The chlorophyll content of one-crop cultivar and two-crop cultivar accorded with the modality and photosynthetic capacity.

一二次花品种叶绿素含量与其外部形态及光合特性相吻合，说明叶绿素含量变化与光合能力有显著的相关性。

The experiments were conducted with one-crop cultivar and two-crop cultivar of Iris germanca . Photoperiod in nature condition and the effects of different photoperiods on flower bud differentiation and photosynthetic characteristics were investigated.

本试验以德国鸢尾一次花和二次花品种为材料，从植株生物学特性和光合特性两个层面上，研究一二次花品种在自然状况下的光合特性以及不同光周期对其花芽分化和光合特性的影响。

The changes of the photosynthetic capacity of the one-crop cultivar were slow; but the the photosynthetic capacity of two-crop cultivar increased, that prepared for the two-crop flower.

花前光合能力强，花后弱；8月一次花光合能力变化缓慢，而二次花品种光合能力迅速增加，为二次开花做准备。

Short-day treatment with stronger the photosynthetic capacity in leaves per unit area of two-crop cultivar, but longer day treatment with stronger the total photosynthetic capacity; Longer day treatment with stronger the photosynthetic capacity in leaves per unit area of one-crop cultivar.

短日照下二次花单位叶面积的光合能力较强，但其总体光合能力是长日照大于短日照；长日照下一次花植株单位叶面积的光合能力较强。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。