Like any other gramineous crop , hybrid rice keeps 80 % of totally removed k in its shoots after ripening , only about 20 % of k uptake is transported to grain , grain k content was more stable , usually around 0 . 5 % 同其它禾本科作物一样，成熟后杂交水稻保存总移出钾的80 %在其茎杆中，只有20 %吸收的钾转移到籽粒中，籽粒含钾量更为稳定，一般约为0 . 5 % （表6 ） 。
Moreover the pf40 gene was ubiquity distributed in cereal crop genome . dicots such as tobacco and tomato do not have the pf40 homolog gene , but we found its homolog gene maybe present in arabidopsis genome 用该基因与玉米、小麦、水稻主要禾本科作物的基因组dna杂交，结果表明pf40基因及其同源基因普遍存在于禾谷类植物中，同时在拟南芥基因组中也有pf40基因的同源序列。
The result indicated that the area proportion of dense woods , mixed needle leaf and bruad leaf forest and hush of woods had certain increase , and the area proportion on the economic forest , grass family crops and naked land will have certain reduction 研究结果表明，茂密林、针阔混交林和灌木林的面积比例将有一定幅度的增加，而经济林、禾本科农作物和裸地面积将有一定比例的减少。
Epidemiologists had long suspected that the low cancer rates in southeast china might be related to coix , a grasslike relative of maize that is a dietary staple in the region and a key ingredient of many traditional chinese herbal medicines 流行病学专家长期以来一直疑心，中国东南部癌症发病率低是由于那里的人们喜欢食用薏苡仁（禾本科植物薏苡） ，此地区的人们喜欢将薏仁作为饭食的成分，薏苡也是许多中药的关键成分之一。
In the paper , the ecophysiological characteristics of achnatherum splendens , the effects of water and fertilizer on it and a comparative research to other grass were studied , which provided scientific basis on utilization and exploitation of achna therum splendens 本文研究了在黄土高原大面积生长的优良禾本科牧草?芨芨草的生理生态特性、水肥因子对它的影响以及同其它两种牧草(本氏针茅和厚穗冰草)间的比较，为芨芨草的开发利用提供科学依据。
Analysis of the variation of bases of epsps of brassicaceae , solanaceae and poaceae indicate that the evolutionary rates of epsps are different between brassicaceae and solanacea e and the rate in solanaceae is higher than the rate in brassicaceae according to the total substitution rate of bases 分别对十字花科、茄科、禾本科序列的碱基变异情况分析，结果表明， epsps基因在十字花科和茄科中的进化速率不一样，对于总的碱基替换率，茄科高于十字花科。
Is an important perennial genus of triticeae dumortier ( poaceae ) . it includes about 30 species and 19 subspecies . they are distributed in the coastal areas of north sea , central asia , east asia , extending to alaska and the western areas of north america 是禾本科poaceae小麦族triticeaedumortier的一个重要多年生属，全世界大约有30个种和19个亚种，从北海的沿岸地区，越过中亚到东亚直至阿拉斯加和北美西部的广阔地域均有分布，多数种类集中于中亚和北美的高山。
Detailly , it was ( l ) to isolate and construct high efficiency expression vector of rice starch branching enzyme gene sbe2b and ( 2 ) to establish a high - effecient rice transformation system . total rna was extracted from maize endosperm 15dap ( days after pollination ) . and cdna of sbe2b was obtained through rt - pcr . sequencing result showed that the full length cdna was 2 . 4kbp , coding for 800 amino acids , with estimated mw 93kd 本研究从授粉15天左右的玉米胚乳中提取了总rna ，采用rt - pcr方法，克隆了玉米胚乳的淀粉分支酶基因sbe2b ，测序结果表明，玉米胚乳sbe2b的cdna全长为2 . 4kb ，编码800个氨基酸，推测的氨基酸的分子量为93000d ，该序列与genbank中登录号为af072725的玉米sbe2b的cdna序列有98的同源性，与水稻、大麦、小麦等禾本科植物的有关淀粉分支酶的dna序列都有极高的同源性。
Abstract : because of the importamce of rice as the staple food source for over half of the world population and since rice is a leading model plant for genomic studies , an international effort has now begun to sequence the rice genome . this project eventually will reveal all of the genomic sequence information of rice and be an indispensable aid in understanding the genomics of other grass species . in this paper , the development and research progress in sequencing of rice genome are reviewed 摘要水稻是最重要的粮食作物之一,世界上大约有一半的人口以水稻为主要粮食.作为基因组研究的模式植物,水稻基因组的测序工作已在世界范围内展开.此项研究工作不仅能破译水稻全基因组序列,还将有助于了解其他禾本科植物的基因组信息.本文对水稻基因组测序工作进展作一综述。
The soil salification is a serious problem for agriculture and environment . especially now with the development of industry , the situation of soil salification becomes more and more serious , and the quality of water is continuous worsened . research on the mechanism of salt tolerance especially in the important crops , such as wheat , is becoming more urgent than ever before 土壤盐渍化是影响农业生产和生态环境的严重问题，随着工业污染加剧，灌溉用水的质量不断下降和化肥使用不当等原因，次生盐碱化土壤面积有不断加剧的趋势，给农业生产造成重大损失；黄矮病毒病是小麦等禾本科植物的重要病害之一，其传毒介体蚜虫更使植物产量损失巨大。
