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Under salt stress, the growth, osmotic potential, chlorophyll fluorescence parameters, Na(superscript +) and K(superscript +) uptakes and transports in the seedlings of two Ricinus communis varieties (cultivar castor Zibi 6 and wild castor which grew naturally in coastal saline-alkali land) were comparatively studied.

方法］比较了栽培蓖麻淄蓖6号和天然生长于滨海盐碱地的野生蓖麻体内K、Na的分布特点、叶绿素荧光参数、植株生长状况和叶片渗透调节能力对NaCl处理的响应。

Cultivar resistance has been the most effective way to control Phytophthora root rot.

利用抗病品种是防治大豆疫霉根腐病最有效的方法。

In order to discuss the signal transduction mechanism,wheat cultivar Lovrin10 and different leaf rust fungus races were used to form compatible and incompatible interaction groups to study the role of drugs affecting calcium metabolism and calcium channel on HR induced by wheat leaf rust fungus.

为进一步探讨小麦抵抗叶锈菌侵染的防卫反应的信号转导机制，利用小麦品种洛夫林10和不同叶锈菌生理小种组成亲和与不亲和组合，研究影响Ca2+代谢和钙通道的药物对小麦受叶锈菌侵染后诱发的HR的作用。

The callus derived from mesocotyl and vascular bundle of scutellum showed different cellular characteristics from scutellar epithelial callus in cultivar Aikoku.

华南农业大学农学院广州510642；日本名古屋大学农学部名古屋市464-01；日本名古屋大学农学部名古屋市464-01和田富吉

The results of field and greenhouse trials both showed that cultivar hui-2 was resistant to powdery scab.When a certain amount of seedcake was applied,satisfactory control of powdery scab could be achieved.The effects of other treatments were insignificant.

结果表明：在大田试验和温室盆栽试验中，品种会-2对马铃薯粉痂病均表现较高的抗性，在播种穴中施用适量的豆饼进行处理均能较好地防止粉痂病的发生，其他处理的防治效果则不明显。

In this study, an OsNPR1 rice over-expression vector was constructed and transformed into rice cultivar TP309 and 17 homozygous lines were obtained by self-fertilization and selection. The genetic stability of introduced OsNPR1 in the T3, T4 progenies of homozygous lines was confirmed by PCR. When the transgenic plants were challenged with bacterial blight pathogen Xanthomonas oryzae pv.

构建OsNPR1基因水稻过量表达载体，并将其转化粳稻TP309得到转基因植株；通过自交纯合，得到17个纯合株系；对T3、T4代纯合株系进行PCR鉴定，证实转基因纯合株系中外源OsNPR1基因具有遗传稳定性；检测了T1、T2代转基因株系和T3代转基因纯合株系对水稻白叶枯病病原细菌Xanthomonas oryzaepv。

For the breeding of a new cultivar with high yield and good quality characters, these principles are to be followed in terms of the genetic contribution of the principal components: fristly, choose the hybrids with more total silique per plant and silique of main reaceme, and higher yield and oil content: next select the progenies with longer main raceme; and finally retain good quality lines with more branches.

主成分分析可以把这些具有相互关联的性状，归结为少数几个相互独立的综合性状，从而使问题简化，便于抓住研究对象的主要方面，故在作物多性状关系分析及其选择、正确选配亲本、提高后代选择效果等方面具有指导作用，其应用研究在小麦、水稻、大豆、花生等作物中有许多报道〔'一'〕，但在油菜中的研究尚不多见。

Lack of significant growth in the world average yield in upland cotton since 1991 reinforces the impression that the cotton industry has entered into a long梩erm period of slow growth in production. Breeding contribution to the yield growth has sharply decreased, and the result of cotton cultivar performance of regional test displayed that the potentials for the growth of yield in new developed cultivars was delimited, which implies that we must pay more attention to the studies on the diversity of cotton cultivers and genetic mechanism for yield traits.

自90年代初以来，英国及世界的棉花平均产量没有明显得到提高而育种方面对产量的贡献已大大降低；我国的棉花品种区域试验结果也表明，常规品种的增产幅度较低，需要深入研究棉花品种的遗传多样性和产量性状的遗传规律。

The homologous analysis showed that the identity between AVA and Galanthus nivalis agglutinin, Narcissus hybrid cultivar agglutinin, Lycoris radiata agglutinin, Clivia miniata agglutinin are 73.4％, 85.3％, 80.7％, 83.5％,respectively. Molecular modeling of AVA indicated that its three-dimensional structure strongly resembles that of the snowdrop agglutinin. Blocks' analysis revealed that the deduced amino acid sequence of AVA has three functional domains specific for agglutination and three carbohydrate-binding boxes.

成熟蛋白在氨基酸水平上与雪花莲凝集素、水仙凝集素、石蒜凝集素和君子兰凝集素分别有73.4％、85.3％、80.7％和83.5％的同源性；朱顶兰凝集素的分子模式显示其与雪花莲凝集素有极其相似的三维结构；在Blocks数据库中检索AVA蛋白氨基酸序列的结构域，发现有3个凝集素功能结构域，并具有3个典型的甘露糖专一结合位点盒。

Effects of different nitrogen levels (0, 45, 90, 135 and 180 kg/hm^2) in spike stage on differentiation and degeneration of branches and spikelet of hybrid rice cultivar Liangyoupeijiu was studied under the condition of field environment.

以两优培九为材料，大田条件下研究水稻穗肥不同施氮量(0， 45， 90， 135， 180 kg/hm^2)对颖花和枝梗分化和退化的影响。

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