Acidified seawater suppresses insulin‐like growth factor I mRNA expression and reduces growth rate of juvenile orange‐spotted groupers,Epinephelus coioides (Hamilton, 1822)          下载免费PDF全文

Yi Ta Shao  Feng Yu Chang  Wen‐Chun Fu  Hong Young Yan 《Aquaculture Research》2016,47(3):721-731

Ocean acidification, resulted from high level of carbon dioxide (CO₂) dissolved in seawater, may disturb the physiology of fish in many ways. However, it is unclear how acidification may impact the growth rate and/or growth hormones of marine fish. In this study, we exposed juvenile orange‐spotted groupers (Epinephelus coioides) to seawater of different levels of acidification: a condition predicted by the Intergovernmental Panel on Climate Change (pH 7.8–8.0), and a more extreme condition (pH 7.4–7.6) that may occur in coastal waters in the near future. After 6 weeks of exposure, the growth rates of fish in pH 7.4–7.6 were less than those raised in control water (pH 8.1–8.3). Furthermore, exposure at pH 7.4–7.6 increased blood pCO₂ and HCO₃^? significantly; exposure at pH 7.8–8.0, meanwhile, did not affect acid–base chemistry. Moreover, exposure to pH 7.4–7.6 resulted in lower levels of hepatic igf1 (insulin‐like growth factor I) mRNA, but did not affect levels of pituitary gh (growth hormone) or hypothalamus psst2 and psst3 (prepro‐somatostatin II and III). The results show that highly acidified seawater suppresses growth of juvenile grouper, which may be a consequence of reduced levels of IGF‐1, but not due to diminished growth hormone release.  相似文献   

Legacy effect of previous residue addition—influence of length of the moist period between residue additions on soil respiration,microbial biomass and nutrient availability     

Trung Ta Nguyen  Hue Thi Thanh Ngo  Petra Marschner 《Biology and Fertility of Soils》2016,52(8):1047-1057

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接坝山区陡坡地段阔叶林改造对水文生态环境的影响     

塔莉  梁文俊 《水土保持通报》2019,39(4):166-171,176

[目的]研究接坝山区陡坡地段引针入阔进行阔叶林改造以后对水文生态环境的影响,为该区造林与改善水文生态环境提供一定的科学依据。[方法]以研究区3种典型植被类型作为研究对象,采用室内浸泡法、环刀法分别对枯落物层与土壤层水文生态效应进行定量测定。[结果]①枯落物蓄积量依次为:油松—山杏混交林山杏林绣线菊灌丛;有效拦蓄量依次为:油松—山杏混交林山杏林绣线菊灌丛;枯落物持水量、枯落物持水速率与浸水时间存在较好的函数关系。②3种植被类型有效持水量依次为:油松—山杏混交林(69.00 t/hm~2)山杏林(60.87 t/hm~2)绣线菊灌丛(55.60 t/hm~2);3种植被类型中油松—山杏混交林初渗速率最大为29.78 mm/min,绣线菊灌丛初渗速率最小为22.38 mm/min;3种植被类型土壤入渗速率与入渗时间存在较好的幂函数关系(R~20.97)。[结论] 3种不同植被类型中油松—山杏混交林水源涵养功能最强,而绣线菊灌丛水源涵养能力最差,说明在陡坡地段进行阔叶林改造在一定程度上增强了林分水源涵养能力,改善了林分水文生态环境,因此从增强涵养水源的角度出发,建议在该地区灌木林与阔叶林中引入适当密度油松,从而改善该地区水文生态环境。  相似文献   

High?throughput phenotyping of two plant?size traits of Eucalyptus species using neural networks     

Marcus Vinicius Vieira Borges  Janielle de Oliveira Garcia  Tays Silva Batista  Alexsandra Nogueira Martins Silva  Fabio Henrique Rojo Baio  Carlos Ant?nio da Silva Junior  Gileno Brito de Azevedo  Glauce Taís de Oliveira Sousa Azevedo  Larissa Pereira Ribeiro Teodoro  Paulo Eduardo Teodoro 《林业研究》2022,(2):591-599

In forest modeling to estimate the volume of wood, artificial intelligence has been shown to be quite effi-cient, especially using artificial neural networks (A...  相似文献   

水分胁迫对西藏不同基因型春大麦发芽的影响     

次仁央金田和平  多吉平措 《中国农学通报》2011,27(3):26-30

此文通过不同的水分胁迫处理对4个西藏春大麦品种进行发芽研究。结果表明：（1）水分胁迫下,所有品种的种子萌发均受到不同程度的抑制作用,四个品种在重度胁迫时萌发抑制率为16%~52%,轻度胁迫时萌发抑制率为4%~50%,其中对日喀则17号抑制作用最大;（2）水分胁迫下,所有品种的种子发芽率、发芽指数及活力指数均下降,对藏青320的发芽影响最大,随着水分胁迫加强其发芽速度明显减慢,麦芽长势明显差,其次依次是曲玛132、日喀则17号和藏青148;（3）水分胁迫抑制春大麦发芽期间芽和根的生长,且表现出随着水分胁迫加强芽受抑制敏感程度大于根,日喀则17号对根部抑制表现最敏感,藏青320对芽的抑制表现最敏感。不同基因型春大麦发芽过程对水分胁迫的反应不同,说明春大麦种子耐旱性存在基因型差异,4个西藏春大麦品种中,从种子发芽期间的综合表现看,藏青148种子生育前期耐旱性相对较好,曲玛132种子次之,藏青320和日喀则17号种子耐旱性相对较差。  相似文献   

Distribution of different Vrn-B1 alleles in hexaploid spring wheat germplasm     

Zbyněk Milec  Taťána Sumíková  Lenka Tomková  Kateřina Pánková 《Euphytica》2013,192(3):371-378

In wheat, the transition from the vegetative to reproductive stage is primarily controlled by the series of vernalisation (Vrn-1) genes located on the homoeologous group 5 chromosomes. Up to 2009, only two alleles at the Vrn-B1 locus were known: one dominant, spring, allele (now designated Vrn-B1a) and the other recessive, winter, (vrn-B1) allele. Recently, two additional dominant alleles, Vrn-B1b and Vrn-B1c, were described. In this study, we screened a range of hexaploid spring wheat germplasms for the presence of different Vrn-B1 alleles using new diagnostic molecular markers. Our results show that the Vrn-B1a allele was the most prevalent, being present in 55.3 % of the 2,495 accessions examined, followed by the recessive vrn-B1 allele, which occurred in 31.5 % of the accessions. The novel alleles Vrn-B1b and Vrn-B1c were found in 5.3 and 7.9 % of all accessions, respectively.  相似文献   

从优良品种选育试验结果谈西藏冬青稞育种发展对策   总被引：1，自引：0，他引：1  

其美旺姆  雄奴塔巴  次珍  唐亚伟  梁春芳  周强  汪龙  刘仁建  蒲海生 《西藏农业科技》2007,29(3):34-38

经过对2003年自治区农科所冬青稞优良品种选育试验品种及对照品种产量进行统计分析,总结出西藏冬青稞良种选育试验品种产量水平的变化趋势及特征特性,提出今后冬青稞育种目标是产量和质量并重,主攻早熟、抗倒、越冬性能强的品种。  相似文献   

动物细胞凋亡与疾病的发生     

龙塔  杨自军  董发明  董淑丽  王天奇  温文彦 《河南科技大学学报(农学版)》2003,23(3):38-40,43

细胞凋亡和细胞坏死是细胞死亡的两种形式，前者属于生理性的平衡机制，后者则是由于致病因子作用下发生的病理过程。免疫系统抑制与细胞凋亡有关，在免疫系统中存在两种细胞程序性死亡，一种是在无生长因子时，Bcl-2基因调控的程序化死亡；另一种是细胞毒介导的靶细胞的程序化死亡。细胞凋亡是动物机体对病毒侵入的一种防御机制之一，当细胞凋亡和细胞增殖平衡破坏时，可引起多种疾病的发生。  相似文献   

植物Cation/H＋反向转运蛋白研究进展     

单喆  张欣欣  高野哲夫  柳参奎 《广西农业生物科学》2012,(3):303-309

CAX是一种通过质子梯度产生的能量运输协调再分配钙离子（Ca2＋）等阳离子的转运蛋白,是Ca2＋/Cation antiporter （CaCA）大家族的一个分化枝.植物CAXs属于CAX三大类的Ⅰ型CAX.大部分植物CAXs有11个跨膜区（TM）和5个典型的功能域,即N-端自抑制区域（NRR）、C-端功能区域、Ca2＋功能域（CaD）、C功能域和D功能域.其中NRR存在于大部分CAX中,调节CAX的功能.以下综述了近年来国内外对CAX类蛋白的研究成果与进展,涉及到CAX家族的命名,亚家族的分类,CAX组织表达及亚细胞定位,特别是CAX的转运活性等研究.加强对CAX的研究对调节植物生长、提高农作物养分吸收和减轻土壤中污染物等有重要作用.  相似文献   

大棚黄瓜中有机磷农药残留调查   总被引：1，自引：0，他引：1  

塔娜  田维平  张志娟  张秀芳 《内蒙古农业大学学报(自然科学版)》1997,(3)

本文对大棚黄瓜中3种有机磷农药残留量进行了调查。结果表明黄瓜中有机磷农药残留量范围为敌敌畏未～1．584mg·kg－1、甲基对硫磷为未～0．133mg·kg－1，马拉硫磷未～0．0188mg·kg－1。大棚黄瓜中3种有机磷农药残留量的检出率和超标率为甲基对硫磷＞敌敌县＞马拉硫磷。  相似文献