The results showed that there existed distinct variation in endosperm cells of leymus species . different species had different endosperm cells . the significant variations were mainly included differences in the sizes , forms and quantity of endosperm cells 2 .对21个物种的胚乳细胞特征进行观察测量，结果表明赖草属植物种子胚乳细胞存在丰富的多样性，不同物种的胚乳细胞在大小、形状和数量上均表现出明显的差异，其胚乳细胞的特征具有共属分种的意义。
The study of the structure and function of these promoters will help not only to comprehend the development of seeds and the mechanisms of gene expression and organic substance accumulation but also search for some promoter elements useful for plant genetic engineering 对这类启动子的结构和功能元件的了解，有助于人们更加深入地理解高等植物基因表达调控机制，提高人们对植物种子发育过程及有机物在种子中积累机制的认识，而且可以为植物基因工程中生物反应器的研究提供有应用价值的启动子元件。
The thesis studied on the physiological characteristics of ceratoides l . the contents were composed of the germination characteristics , the resistance of seed and seedling , the nutritive composition , the hormone content , the seed production and the molecular physiology , we studied the deterioration mechanism of seed as well 本论文对驼绒藜属植物种子的生理学特性进行了研究，包括种子的萌发特性、幼苗的耐逆性、种子的营养成分、激素水平、分子生物学以及种子生产技术等内容，同时对种子的劣变机理进行了探讨。
The cuticular membrane in the species of physochlaina is simultaneously striate , granular and scaly , while only striate , or occasionally granular in the species of hyoscyamus . 2 . seed morpholoy seed morphology of 25 species in seven genera of the tribe hyoscyameae and three related genera was investigated under sem for the first time 种子形态学在扫描电子显微镜下首次全面研究了天仙子族及颠茄属和茄参属等共10属25种植物的种子形态学特征，结果表明：该族植物种子表面纹饰有脑纹状或近脑纹状和网状两大类，除了山莨菪属anisodus和hyoscyamus
Abstract : this paper depicts the physiological basis for the application of rare earth elements in agriculture . the contents , distribution , the forms and cytolocalization of rare earth elements in plants are discussed . the effects of rare earth elements on seed germination , root development , seedling growth , nutrient uptake , change of hormones , and photosynthesis are also discussed . further more the rare earth elements affecting the plasma membrane and calcium physiological function are reviewed as well 文摘:本文从稀土元素在植物中的含量分布、存在形式、细胞定位以及它对植物种子萌发、根系发育、植物生长、养分吸收、内源激素变化、光合作用、质膜结构与功能和钙离子生理功能的影响等方面阐述了稀土在农业中应用的生理学基础。
This paper summarized the disturbance effect of rodents on soil ( pedogenesis , patch formation , and physical and chemical properties ) and vegetation ( species diversity , productivity , and seed dispersion ) , aimed to illustrate the contributions of rodents activities to desert ecosystem 本文主要从鼠类活动对土壤（包括土壤发生过程、土壤斑块的形成、土壤理化性质）和植物群落（包括物种多样性、生产力、植物种子）的扰动效应做了归纳总结，旨在阐明鼠类在荒漠生态系统中的作用。
On one hand , the allelopathy caused by petroleum ether and ethanol extracts of s . chamaejasme leaves on the other plants germination was investigated , on the other hand , the inhibition of the 2 extracts on insects and pathogenic microorganism of crop were tested . the aim of these studies is to provide empirical foundation for the development of a new botanic pesticide 本文从化感作用的角度出发，研究了瑞香狼毒叶石油醚和乙醇两种提取物对植物种子萌发的影响，同时研究了两种提取物对作物病原菌和昆虫生长的抑制作用，目的在于揭示瑞香狼毒叶是否具有化感作用，并为一种新的植物源农药的开发提供实验依据。
First , the ceratoides . l seed belongs to low nutrition seed and it " s nature longetivity was short ; second , because of the harsh environment during seed developing , seeds were short of nutrition and the development were uncomplete ; third , because of the unsuitable storage condition , especially because the water contens was higher , the seed deteriorated rapidly 对驼绒藜属植物种子短命和劣变原因的初步分析，认为是由遗传和环境两方面的原因所至：一是由于驼绒藜植物属于高数量低营养种子类型，种子自然寿命较短。二是由于种子发育过程中自然环境恶劣，造成种子营养不良，发育程度较差。
