Screening and analysis of differentially expressed genes from an alien addition line of wheat Thinopyrum intermedium induced by barley yellow dwarf virus infection.

The alien addition line TAI-27 contains a pair of chromosomes of Thinopyrum intermedium that carry resistance against barley yellow dwarf virus (BYDV). A subtractive library was constructed using the leaves of TAI-27, which were infected by Schizaphis graminum carrying the GAV strain of BYDV, and the control at the three-leaf stage. Nine differentially expressed genes were identified from 100 randomly picked clones and sequenced. Two of the nine clones were highly homologous with known genes. Of the remaining seven cDNA clones, five clones matched with known expressed sequence tag (EST) sequences from wheat and (or) barley whereas the other two clones were unknown. Five of the nine differentially expressed sequences (WTJ9, WTJ11, WTJ15, WTJ19, and WTJ32) were highly homologous (identities >94%) with ESTs from wheat or barley challenged with pathogens. These five sequences and another one (WTJ18) were also highly homologous (identities >86%) with abiotic stress induced ESTs in wheat or barley. Reverse Northern hybridization showed that seven of the nine differentially expressed cDNA sequences hybridized with cDNA of T. intermedium infected by BYDV. Three of these also hybridized with cDNA of line 3B-2 (a parent of TAI-27) infected by BYDV. The alien chromosome in TAI-27 was microdissected. The second round linker adaptor mediated PCR products of the alien chromosomal DNA were labeled with digoxygenin and used as the probe to hybridize with the nine differentially expressed genes. The analysis showed that seven differentially expressed genes were homologous with the alien chromosome of TAI-27. These seven differentially expressed sequences could be used as ESTs of the alien chromosome of TAI-27. This research laid the foundation for screening and cloning of new specific functional genes conferring resistance to BYDV and probably other pathogens.     

一个未知的特异结合雌激素效应元件编码链的单链结合蛋白

本文介绍一个不是雌激素受体（ＥＲ）却能专一地结合雌激素效应元件（ＥＲＥ）编码单链的单链结合蛋白,对此蛋白在细胞中的定位、组织中的分布、热稳定性、同二价金属离子的关系作一初步研究。发现其受雌激素负调控。此蛋白在人病理样品２９例乳癌中同ＥＲ的含量似有一定的负相关关系,讨论了上述结果的意义。     

一例智力低下患者7q~ 标记染色体的来源鉴定

以人类染色体显微切割、PCR技术构建的现有人类染色体特异性和染色体区带特异性探针池作为绘画探针,采用正向染色体绘画技术,结合染色体筛查方法,查明了一例7q~ 标记染色体患者的染色体附加片段来源于3q26→3qter。确定该患者的核型为46,XX,-7, der(7)t(7;3)(7pter→7q32::3q26→3qter)。应用这个策略,能够快速有效地鉴定标记染色体的来源。     

Active expression of Gγ globin gene on chromosome 11 with Yunnanese (Ayγδβ)~0-thalasseinia deletion in MEL cells

A permanent lymphocyte cell line of a heterozygote with Yunnanese (Aγδβ)0-thalassemia deletion, associated with an increased production of Cry globin in adult, was founded using Epstein-Barr virus transformation. The hybrids of the lymphocyte cell and mouse erythroleukemia cell (MEL) were achieved and the hybrids containing human chromosome 11 were selected with the monoclonal antibody 53/6. The subclones containing only either the normal or the abnormal human chromosome 11 were separated and the expression of the human globin genes was studied. Expression of the β-globin gene, but not the Cγ and Aγ, was observed in the hybrids containing only the normal human chromosome 11, while active expression of the Cγ globin gene was observed in the hybrids containing only the abnormal human chromosome 11. These results have confirmed that the DNA deletion in the β-globin gene cluster is the cause of persistent active expression of the Cγ globin gene in the Yunnanese mutant.     

野生猕猴声行为的研究

本文通过在华南四省区对四个野生种群猕猴声行为的观察和现场录音,对它们的叫声声学特性,行为模式和其它个体对其相应的行为反应进行了定量的分析研究,并得出１１种不同的声行为,这些声行为有相互不同的声学特性,不同的行为模式并引起其它个体相应的行为反应,从而起着通讯的作用。叫声在猕猴的声行为通讯中,一些借助视觉提示,至少以不同的刺激度来“表示”某一类事物,并得到个体间的“共识”有些甚至无需视觉提示而单独传递     

半自然条件下麋鹿的生长发育与繁殖习性

在大丰保护区的半自然条件下,麋鹿新产仔鹿性二型差异大于圈养条件下的仔鹿;１龄幼鹿第１年生长发育迅速,其后足长已基本达成体后足长;４岁时后足长即已显著大于引进的成体鹿。大丰雌性麋鹿３岁开始产仔,比圈养条件下晚１年,４岁时体重方达成体重。雄性５岁后方能达成体重并才有机会获得交配权．发情期主要集中于６月上、中旬,产仔期主要集中于３月中、下旬,产仔半数时间为３月２７日,产仔期比圈养麋鹿更趋集中。仔鹿产后１～３天为“印记”的敏感期,１周龄后即开始随群活动并有觅食行为。     

广西龙虎山猕猴种群生态特征

１９８８～１９９５年,采用定点观察法和绝对计数与相对计数结合法对龙虎山猕猴种群生态作了调查研究。１９９０年核心区有猕猴１４群,５００只左右,猴群密度１．６群／ｋｍ２,种群密度５５．６只／ｋｍ２．猴群大小平均３３．８±２３．１（ｎ＝６）只。一般每隔４～５年分群一次,猴群群体年均增长率１４．８％,种群年均增长率为９．７％。猴群中成年猴性比为７．６±６．５（ｎ＝１２）,１～３岁组的性比为０．７４±０．６１（ｎ＝４）,群内未成年猴比例为６７．７±３．１％（ｎ＝１２）。发情交配期最早１１月１２日,最晚次年１月２０日,高峰期１２月上旬,持续３个月．产仔期最早４月１日,最晚８月１４日,高峰期５月上旬,持续时间４个半月．繁殖率４５．５％～１００％,平均７５．４±１３．２％（ｎ＝２１）。新生猴死亡率较低,新生猴性比（雌：雄）平均０．７４±０．３４（ｎ＝５）。     

Photo-induced activation of cytochrome P450/reductase fusion enzyme coupled with spinach chloroplasts

Summary Photoactivation of cytochrome P450 monooxygenase was studied using a combination of spinach chloroplasts and yeast microsomes containing rat P4501A1/yeast reductase fusion enzyme. Under illumination, in the reaction mixture, NADP was reduced, transferring electrons to the P450/reductase fusion enzyme to convert 7-ethoxycoumarin to 7-hydroxycoumarin.     

桂平市竹笋资源及其开发利用

桂平市食用竹笋资源丰富,有大头竹笋、吊丝竹笋、浦竹笋、毛竹笋等十余种,年产鲜笋８５００ｔ以上。原有的加工方法比较落后,现已注意引进新技术,今后还需进一步开发利用。     

浩浩巴组织培养和快速繁殖

浩浩巴顶芽、茎段在ＭＳ基本培养基中培养,附加植物激素１～２ｍｇ／Ｌ的ＢＡ或ＺＴ和０．２ｍｇ／Ｌ的ＮＡＡ配合使用明显促进芽苗形成。诱导生根采用两步生根法能有效地提高生根率。试管苗移栽获得成活。