共查询到20条相似文献,搜索用时 203 毫秒
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1.在秸秆还田与实地氮肥管理条件下,产量与品质形成的特点与秸秆未还田相比,秸秆还田增加了水稻的产量,降低了单位面积穗数,提高了每穗粒数、结实率与千粒重,改善了稻米的外观品质与食味品质。与习惯施肥法相比,实地 相似文献
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解读了盆景与园林同源相生的涵义,认为盆景是把园林景观结合起来的艺术产物,园林是盆景的模本,而盆景又是园林的小样。探讨了盆景与园林的美学思想,解析了盆景和园林的形式美原则,并从主题与立意,布局与构图,变化与统一,主次与均衡,点题与题咏方面,总结了盆景与园林的造景艺术手法。 相似文献
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高原湖泊西昌邛海生态与环境保护初探 总被引:2,自引:2,他引:0
对高原湖泊西昌邛海生态与环境的现状进行了宏观调查与研究,分析了造成西昌邛海生态与环境污染的因素,对西昌邛海的水质情况进行了长达6年的监测与检测,提出了防止内陆湖泊富营养化和生物安全的意见与举措. 相似文献
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在分析交通信息公共服务网站建立的意义和作用的基础上,设计了网站的结构与总体框架,提供了相关的空间数据与属性数据的采集与存储方式,并分析与建立了相关的Web-GIS结构,同时提出了在SuperMap平台与VS.NET开发环境中此类网站开发与实施方法。 相似文献
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院县合作共建促进了科技行为与政府行为的有机结合,促进了科技创新与成果转化,促进了新农村建设与生产发展,促进了科技行为、政府行为与农民行为的统一;搭建了科技成果转化平台,为科技服务、科技推广和科技帮扶开辟了新的思路、新的途径;加速了农民增收、农业增效、农村发展的步伐,创造了较好的社会效益和经济效益. 相似文献
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采用Granger因果检验分别对2001—2008年的中国短期贷款规模与股票市场波动关系及中国中长期贷款规模与股票市场波动关系进行了实证分析,发现股票市场的繁荣与衰退会引起短期贷款与中长期贷款规模的扩张与萎缩,而不是短期与中长期的贷款规模变化决定了股票市场的波动。从机制上探讨了股票市场与信贷规模的相互影响,进一步验证了信贷扩张过快时股票市场的风险会明显加大,从而提示监管机构与投资者引起警觉。 相似文献
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高职动物生产类专业课程建设与改革的研究与实践 总被引:1,自引:0,他引:1
梳理了高职动物生产类专业课程建设与改革的不同发展阶段,剖析了高职动物生产类专业课程建设与改革的现状及存在问题,预测了高职动物生产类专业课程建设与改革的发展趋势,提出了高职动物生产类专业课程建设与改革的思路与对策. 相似文献
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Shoot branching is regulated by the complex interactions among hormones, development, and environmental factors. Recent studies into the regulatory mechanisms of shoot branching have focused on strigolactones,which is a new area of investigation in shoot branching regulation. Elucidation of the function of the D53 gene has allowed exploration of detailed mechanisms of action of strigolactones in regulating shoot branching. In addition,the recent discovery that sucrose is key for axillary bud release has challenged the established auxin theory, in which auxin is the principal agent in the control of apical dominance. These developments increase our understanding of branching control and indicate that regulation of shoot branching involves a complex network. Here, we first summarize advances in the systematic regulatory network of plant shoot branching based on current information. Then we describe recent developments in the synthesis and signal transduction of strigolactones.Based on these considerations, we further summarize the plant shoot branching regulatory network, including long distance systemic signals and local gene activity mediated by strigolactones following perception of external environmental signals, such as shading, in order to provide a comprehensive overview of plant shoot branching. 相似文献
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食用仙人掌芽增殖体系的建立 总被引:2,自引:0,他引:2
研究了基本培养基种类及外源激素对食用仙人掌芽增殖的影响。结果表明,MB基本培养基较MS基本培养基有较高的芽增殖效果。6-BA对食用仙人掌芽增殖有明显的促进作用;KT对芽增殖无明显促进作用;6-BA与KT,6-BA与NAA配合能稳定促进食用仙人掌的芽增殖和进一步发育,获得增殖率高;食用仙人掌芽增殖的最佳培养基为MB+6-BA1.0mg/L+NAA0.5mg/L。 相似文献
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种子包衣和烯效唑调控油菜生长的研究 总被引:2,自引:2,他引:0
在种子播种前进行包衣处理,在油菜幼苗三叶期叶面喷施烯效唑,于不同生育期取样测定种子包衣和烯效唑对油菜生长的调控作用。结果表明:种子包衣在苗期能显著地促进幼苗生长,增加最大叶的长度和宽度,叶色变深,叶绿素含量提高,根系活力增强,根系与地上部的干物重显著增加。烯效唑对包衣油菜的生长有一定的调控作用,使其绿叶数增多,叶片变小增厚,叶色变深,叶绿素含量增加,茎杆增粗,延缓其衰老。种子包衣对油菜整个生长发育过程起调控作用,增加油菜的一次分枝、角果数及地上部的干物重,并促进每角粒数的增加,因而籽粒产量比对照增加22.3%,烯效唑对包衣油菜生长的调控主要是延缓植株衰老,增强其光合作用能力,使其根重、茎重、单株种子重增加,最终达到高产,籽粒产量比对照增加24.8%。 相似文献
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JIANG Zhen-feng LIU Dan-dan WANG Tian-qiong LIANG Xi-long CUI Yu-hai LIU Zhi-hua LI Wen-bin 《农业科学学报》2020,19(4):953-964
Auxin regulates cell division and elongation of the primordial cells through its concentration and then shaped the plant architecture. Cell division and elongation form the internode of soybean and result in different plant heights and lodging resistance. Yet the mechanisms behind are unclear in soybean. To elucidate the mechanism of the concentration difference of auxin related to stem development in soybean, samples of apical shoot, elongation zone, and mature zone from the developing stems of soybean seedlings, Charleston, were harvested and measured for auxin concentration distributions and metabolites to identify the common underlying mechanisms responsible for concentration difference of auxin. Distribution of indole~(-3)-acetic acid(IAA), indole~(-3)-butyric acid(IBA), and methylindole~(-3)-acetic acid(Me-IAA) were determined and auxin concentration distributions were found to have a complex regulation mechanism. The concentrations of IAA and Me-IAA in apical shoot were significantly different between elongation zone and mature zone resulting in an IAA gradient. Tryptophan dependent pathway from tryptamine directly to IAA or through indole~(-3)-acetonitrile to IAA and from indole~(-3)-propionic acid(IPA) to IAA were three primary IAA synthesis pathways. Moreover, some plant metabolites from flavonoid and phenylpropanoid synthesis pathways showed similar or reverse gradient and should involve in auxin homeostasis and concentration difference. All the data give the first insight in the concentration difference and homeostasis of auxin in soybean seedlings and facilitate a deeper understanding of the molecular mechanism of stem development and growth. The gathered information also helps to elucidate how plant height is formed in soybean and what strategy should be adopted to regulate the lodging resistance in soybean. 相似文献
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柑桔黄龙病原侵染长春花和回接成功 总被引:1,自引:1,他引:1
柑桔黄龙病原类细菌(BLO)由草地菟丝子(Cuscuta campestris Yunck)传染到长春花(Vinca rosea L.)上和回接成功。用透视电镜和扫描电镜检查发病长春花和回接发病的甜橙苗的韧皮部筛管细胞,均发现黄龙病原BLO,长度为360~600nm,直径为100~120nm,细胞壁厚为25~30nm。 相似文献
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夏玉米不同土层根系对花后植株生长及产量形成的影响 总被引:2,自引:1,他引:2
【目的】探明夏玉米不同土层根系对花后植株生长及产量形成的调控作用,为生产中塑造高产高效根群结构,提高籽粒产量提供理论依据。【方法】以高产夏玉米品种郑单958和登海661为材料,采用土柱栽培方式,设置3个处理(不断根处理:CK,地下40 cm处断根:T-40,地下80 cm处断根:T-80),于开花期进行断根,研究不同土层根系对地上部生长及产量形成的调控作用。【结果】0—40 cm土层根系对花后氮素积累和转运量影响最大,切断40 cm以下土层根系后植株吸收氮素能力显著降低,植株营养器官氮素向籽粒库的转运量增加。花后40 cm以下土层根系对叶片保绿性和光合性能影响显著,切断深层根系后玉米单株叶面积、叶绿素含量、净光合速率(Pn)和SOD活性显著降低,MDA含量升高,光合高值持续期缩短,单株生物量和籽粒产量显著下降;0—40 cm根系对产量影响最大,40—80 cm根系对穗粒数和千粒重有显著影响,80 cm以下土层根系对千粒重影响较为显著。【结论】高产栽培中促进根系下扎,保持深层根系活力可以防止玉米早衰,提高叶片光合能力和对氮素的吸收能力,有助于提高玉米单产。 相似文献
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研究了不同种植密度和施氮量对杂交狼尾草的产量和品质的影响.结果表明,本地生态生产条件下,以种植密度7株/m2,群体和个体生长最佳,产量最高;杂交狼尾草对氮肥要求大,在本试验施氮范围(470kg/hm2)内,产量随氮水平提高而增加.较高氮水平下,分蘖发生多而快叶面积指数大,干物质积累多;茎叶蛋白质含量在生育期间变化很大,刈割期迟,蛋白质含量明显下降.增加氮肥用量可明显改善鲜草品质. 相似文献