Transcriptome profiling reveals differentially expressed genes associated with wizened flower bud formation in Chinese pear (Pyrus bretschneideri Rehd.)     

Ya Liu  Hu Ping Zhang  Chao Gu  Shu Tian Tao  Dong Sheng Wang  Xian Ping Guo 《The Journal of Horticultural Science and Biotechnology》2016,91(3):227-235

Flower buds are very important for pear yield; non-germinated flower buds become wizened and drop from the branch, reducing pear production. However, little research has focused on the study of wizened flower bud (WB) formation in spring. In order to elucidate the mechanism of WB formation in pear, physiological indices relating to plant hormones and antioxidases were measured. We found that activities of peroxidase (POD) and superoxide dismutase (SOD) were higher and lower, respectively, in WBs than in normal flower buds (NBs). The contents of indole acetic acid (IAA), gibberellin (GA), and cytokinin (CTK) were lower in WBs, while the level of addition of abscisic acid (ABA) was higher in WBs than in NBs. Differentially expressed genes (DEGs) were surveyed between WBs and NBs. In total, 23 DEGs relating to POD and SOD were detected from GO (Gene Ontology) enrichment, and 29 DEGs associated with plant hormone biosynthesis were found from the KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway. Notably, the expression patterns of these 52 genes were consistent with variations of antioxidase activities or hormone contents. Because POD and SOD are stress-response enzymes, the differences in POD and SOD activities between NBs and WBs indicated that WB formation in pear could result from ambient environmental stresses that influence expression levels of hormone biosynthesis genes.  相似文献   

高大房式仓增设辅助通风笼储粮试验     

闵青松  田颖 《粮食储藏》1999,28(6):32-36

在高大房式仓机械通风网络中存在的“死角”问题极不利于粮食的安全储藏。根据途径比理论,在“死角”部位设计并安装了一种辅助径向通风笼,取得很好的效果。本文通风笼的安装部位和尺寸进行了理论推算,对其在运用过程中的合理性和科学性进行了探讨。  相似文献   

大豆新品种豫豆22号的选育及丰产稳产性分析     

梁慧珍  李玉珍 《种子》1999,(4):18-19,22

针对目前黄淮海夏大豆品种存在的突出缺点,采用有效的复合杂交方法,将两种性状差异悬泊优良亲本综合起来,经系谱法定向选择,抗逆性鉴定,决选出售要高产,稳产,高蛋白于一体的夏大豆新品种豫豆２２号。经两年１３点次河南省大豆品种区域试验,平均单产２７４６．５ｋｇ／ｈｍ＾２,较ｃｋ显著增产;丰产稳产性分析,该品种属高产稳产类型。  相似文献   

陆地棉纤维初始发育与胚珠过氧化物酶和吲哚乙酸氧化酶的关系的研究   总被引：1，自引：1，他引：0  

刘康  张天真  潘家驹 《棉花学报》1999,(6)

比较研究陆地棉品种徐州１４２ 与其无絮突变体开花前４ｄ 至开花后６ｄ 胚珠内细胞壁结合的离子型蛋白质含量、过氧化物酶和ＩＡＡ氧化酶活性变化。结果表明, 过氧化物酶和ＩＡＡ氧化酶阻碍纤维的初始发育。  相似文献   

茶皂素在加气混凝土中的应用机理     

王路  夏春华  田洁华 《茶叶科学》1992,12(1):7-13

茶皂素在混凝土工业中的应用研究,已经在加气混凝土浇铸中获得了成功。本文从热力学和茶皂素的结构、表面活性及分散性四个方面,对茶皂素应用于加气混凝土的作用机理,作了理论上的阐述。茶皂素的表面活性结构,是浇铸过程稳泡作用的重要原因,通过表面活性吸附,明显地改善了加气混凝土的气孔结构和发气过程中的料浆流变性能,显著地提高了制品的抗压强度;对发气剂金属起到分散悬浮作用,以改善浇铸体系的发气性能和提高发气效率。实际使用结果表明,提高混凝土浇铸过程的稳定性,成品率提高四个百分点;抗压强度提高10%—20%;减少了制品的  相似文献   

茶皂素的表面活性及其相关的功能性质   总被引：10，自引：0，他引：10  

夏春华  朱全芬  田洁华  柳荣祥  樊兴土 《茶叶科学》1990,10(1):1-10

本文根据近10年来的研究结果,对茶皂素的表面活性及临界胶束浓度(CMC)进行了比较分析,确定茶皂素的 CMC 为0.5%左右,并且在水质硬度0—28.7°d 的范围内几乎不受影响。同时,对茶皂素的去污力、起泡力、湿润性、分散性以及乳化作用等功能性质,进行了全面的研究分析,首次提出了茶皂素对疏水性材料接触角θ在0°<θ  相似文献   

河南木兰属玉兰亚属植物数量分类的研究   总被引：1，自引：0，他引：1  

闫双喜  赵天榜  刘国彦  宋留高  田国行  冯述清  赵东方 《河南林业科技》1998,18(4):5-10

本文采用系统聚类分析方法对河南木兰属玉兰亚属１４种植物进行研究。研究结果表明,聚类的分类特征性状不同,其结果差异显著。如①采用叶部分类特征性状聚类,则１４种植物明显聚为两大类：木兰类和玉兰类。该亚属玉兰组和望春玉兰组植物的聚类结果与其原分类系统相吻合,而木兰组和望春玉兰组应合并为一组,即木兰组。同时,调整了某些种的归属。②采用花部分类特征性状和③综合３８个分类特征特状的聚类结果相一致,不能作为玉兰亚属分组的依据和标准,即难以将１４种植物分成几个大的类别。但是,可以作为玉兰亚属种群鉴定、检验与划分的依据和手段。  相似文献   

黄连木结实期年生长规律的研究   总被引：10，自引：0，他引：10  

肖彦荣  田玉堂 《河北林果研究》1998,13(1):54-57

黄连木具有抗干旱、耐瘠薄、适应性强的特点,最太行山石灰岩山地阳坡造林的良好树种。本文对黄连木结实期大树的年生长发育规律进行了较系统的观测调查,为太行山石灰岩山地黄连木林的营造及经营管理了依据。  相似文献   

Artificial incubation of Great bustard (Otis tarda) eggs     

Wang Jingjun  Tian Xiuhua  Gao Zhaohong  Dong Fenggou  Huang Shouhua  Xu Meirong  Zhang Xinru  Wei Shuqing  Song Jinbao  Ning Yongqiang  Xu Qing 《林业研究》1998,9(2):81-86

A trial of artificial incubation to great bustard (Otis tarda) egg was conducted from 1995 to 1997. Among the 45 collected eggs, 28 eggs were fertilized and 26 hatched, with fertilizing rate 62.2% and incubation rate 92.85%. The mean incubation-days for great bustard egg was confirmed as 24.4 (21–28 days) with the formula for caculating fresh egg weight (W=KwLB ²) and that for counting the incubated days by parents birds in field (Id=24(w−y)/0.144y). The proper incubation temperature and relative humidity were 36–37.8°C and 50–65%, respectively. The egg weights and egg size average 130.45 g and 77.4±1.42×55.5±0.65 mm respectively. The total weight loss of egg was 18.38±0.646 g, daily weight loss 0.748±0.071 g in the incubation time, with a weight loss rate of 13.6±1.02%. A linear regression equation to discribe the relationship between the egg weight and incubation days, was built,y=130.73−0.619x (x-incubation day,y-egg weight) r=−0.978. Twenty-eight hours were nassassary for great bustard embryo to complete the fledging when the were put in gas room. The mean weight of fledglings was 86.3±3.29 g(n=26). (Responsible Editor: Chai Ruihai)  相似文献   

蟒河自然保护区鸟类调查初报   总被引：4，自引：1，他引：3  

田随味  田德雨 《山西林业科技》1998,(2):9-13

１９９１年－１９９７年,对山西省蟒河自然保护区的鸟类系进行了调查。结果为：该区现有鸟类１５１种,其中留鸟５２种,夏候鸟４８种,冬候鸟１７种,旅鸟３４种。  相似文献