Impact of light intensity on flowering time and plant quality of Antirrhinum majus L.cultivar Chimes White

Shades of different light intensities (29%, 43%, 54%, 60% or 68%) along with control (no shade) were studied to observe their effects on the flowering time and plant quality. A hyperbolic relationship was observed between different light intensities under shade, and time to flowering. The total number of flower buds showed a curvilinear relationship with light intensities. Growth parameters related to the plant characteristics such as plant height, leaf area and plant fresh weight were improved under shading treatments at the expense of flowering time and number of flower buds. However, both linear and polynomial models applied assumed that cultivar Chimes White was equally sensitive to light intensity throughout development.     

Impact of light intensity on flowering time and plant quality of Antirrhinum majus L. cultivar Chimes White

INTRODUCTIONManyangiospermsflowerataboutthesametimeeveryyear.Thisoccurseventhoughtheymayhavestartedgrowingatdifferenttimes.Theirfloweringisaresponsetothechanginglengthofdayandnightastheseasonprogresses.Intheearly20thcentury,amutationintobaccocultivarMary-landMammothwasdiscoveredthatpreventedtheplantfromfloweringinthesummerasnormalto-baccoplantsdo.慚arylandMammoth?wouldnotbloomuntillateDecember(GarnerandAllard,1920).Thisreflectedtheeffectofphotoperiodonflowering.Afterwards,onthebasisofl…     

粤东山区蝴蝶兰分生苗与复壮苗平地催花效果研究

通过对蝴蝶兰的叶长、叶宽、叶厚、叶片数、花芽分化率、花茎大小和花苞数的观测,对比分析了分生苗与复壮苗的平地催花效果,结果表明:蝴蝶兰复壮苗催花过程中花茎的长度、花茎的直径和花苞数优于同一品种的分生苗,蝴蝶兰复壮苗催花效果优于分生苗.     

Effects of light and temperature conditions on flowering in Mat Rush

The effects of photoperiod and light intensity on flowering in Mat Rush cv. Gangshan 3 were studied. The results showed that treatments with longer day length stimulated flowering significantly and increased stem flowering percentage (SFP). Plants treated with low light intensity at early stage had substantially reduced florets per cyme, SFP, tillers per plant and stem length. At middle and late stage, low light intensity significantly reduced SFP. The principal climatic factors affecting SFP were as follows: mean temperatures (MT) of the third ten-day period (TDP) in December and of the second TDP in February, actual sunlight hours (SH) of the third TDP in February and precipitation of the third TDP in March. A nonlinear simulation model for SFP was established with experimental results and corresponding climatic data (see Eq. (2)). Simulation by the above equation yielded values the same as those observed from 1992 to 2000, indicating its accuracy in describing the relationship between flowering and light and temperature conditions. The interaction between vernalization and SH is also discussed in this paper. Project (No. 981105) supported by the Ningbo City Science Foundation, China     

Light quality and temperature effects on antirrhinum growth and development

An experiment was carried out to examine the effects of light quality on the growth and development of antirrhinum under three different temperatures 19℃, 24℃ and 27℃ in glasshouses. Five different colour filters (i.e. 'Red absorbing', 'Blue absorbing', 'Blue and Red absorbing' and two 'partially Blue absorbing' materials) were     

应用不同选色方法对临床烤瓷修复效果的影响

[目的]初探应用不同比色方法对临床烤瓷修复效果的影响.[方法]A组选择诊室日光灯下进行人工和电脑选色,部位在修复体对称牙或邻牙的颈1/3、中1/3和切1/3分别比色;B组在不同光源下,多次进行人工和电脑选色.首先在日光灯下选色,然后在窗前选色,最后在中午时分北向的日光下终选色,选色部位如A组.[结果]临床成功病例结果经卡方分析表明:A组电脑和人工选色之间有显著性差异P<0.05;A组和B组之间应用人工选色有显著性差异P<0.05,而应用电脑选色无显著性差异P>0.05;B组应用电脑与人工选色之间无显著性差异.P>0.05.[结论]应用电脑选色不受外界环境因素的影响,比人工选色要客观;人工选色应尽量在多种光源下多次选色.     

非洲菊新品种'紫心红瓣'和'绿心玫红'的组培快繁

为建立非洲菊新品种‘紫心红瓣’和‘绿心玫红’的组培快繁体系。以非洲菊新品种‘紫心红瓣’和‘绿心玫红’花蕾为外植体,研究了不同激素水平对花蕾愈伤组织诱导及植株再生的影响。结果表明,诱导愈伤和芽分化最佳培养基为MS+NAA0.2 mg/L+6-BA2.5 mg/L和MS+NAA0.1 mg/L+6-BA5 mg/L,扩繁培养以MS+NAA0.1 mg/L+6-BA 3 mg/L为宜,最佳生根培养基为1/2 MS+NAA 0.1mg/L。     

光强对桐花树根系生长和根系活力的影响

以2年龄桐花树(Aegiceras corniculatum)为试验材料,研究了不同光照强度[全光照(Ac100)、75%光照(Ac75)、45%光照(Ac48)、20%光照(Ac20)]对桐花树根系生长和根系活力的影响.结果表明,处理360d后,随着光照强度的减弱,桐花树的根生物量和根冠比均呈显著下降的趋势,其中Ac100的根生物量和根冠比最大,分别是Ac25的15.42倍和2.08倍;营养根和贮气根的根数、根长和根直径均呈逐渐递减的趋势,Ac100的营养根根数和根长显著高于其他处理,其中Ac100的营养根和贮气根的根数、根长分别是Ac25的3.85、1.37倍和14.59、1.68倍;根系含水量呈上升趋势,其在6月份最高,冬春季最低;而根系活力则呈下降趋势,其在冬春季呈下降趋势,在夏秋季呈先升后降的趋势.试验表明,不同光照强度对桐花树根系生长和根系活力有显著影响,在100%光照强度下其根系发达,根系活力较高.而在25%光照强度(过度遮光)下不利于根系生长,且桐花树能适应一定程度的遮荫环境.     

平地催花技术对不同品种蝴蝶兰催花效果的研究

在智能化温控大棚中,通过对蝴蝶兰的花芽分化率、双芽率、花茎大小、花蕾数和开花时间的观测,对比分析了不同品种蝴蝶兰的平地催花效果,结果表明:花芽分化率鹦鹉>白花红心>满天红>实生红花,双芽率满天红>白花红心>实生红花>鹦鹉,花茎实生红花>鹦鹉>白花红心>满天红,花蕾数满天红>白花红心>实生红花>鹦鹉;综合指标满天红、白花红心优于实生红花和鹦鹉;实生红花属于早花品种,鹦鹉、白花红心和满天红属于晚花品种.     

淡水种植对桐花树开花结果的影响

在全光照条件下培养红树植物桐花树(Aegiceras Corniculatum)3a龄苗1a,以人工海水(盐度8g.kg-1)为对照,研究了淡水种植对桐花树开花结果的影响.结果表明:人工海水组比淡水组提前23d出现花蕾;淡水组的最早始花日期比人工海水组延迟了50d.两种处理下桐花树的花序数随时间的变化呈现出两个生长高峰期,即第一个生长高峰期出现在2010年12月,第二个生长高峰期在2011年4月.在4月份,淡水组的花序数显著多于人工海水组.两种处理的桐花树座果数及其成熟果实的果重、粗度和长度之间均不存在显著差异.试验表明,桐花树在淡水环境里能够正常开花结果.     

Effects of light and temperature conditions on flowering in Mat Rush

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遮光处理对桐花树光合特性的影响

研究了不同光照强度[全光照(Ac100)、48%光照(Ac48)、20%光照(Ac20)]对淡水种植的桐花树光合特性及叶绿素含量的影响.结果表明:Ac100的净光合速率日变化呈"双峰"型,有显著的"午休"现象,而Ac48和Ac20的净光合速率日变化呈"单峰"型,"午休"程度降低;不同月份期间,遮光处理对桐花树的净光合速率(Pn)、有效光合辐射(PAR)、气孔导度(Gs)和蒸腾速率(Tr)均存在显著影响.遮光处理的桐花树叶片最大光合速率(Pmax)、光饱和点(LSP)、光补偿点(LCP)、暗呼吸速率(RD)以及表观量子效率(AQY)与全光照处理相比均下降;随遮光度增大,叶片叶绿素a+b和叶绿素b含量显著升高,而叶绿素a/b降低,且叶面积显著增大.试验表明遮光处理通过影响环境因子和桐花树叶片生理特性等内在因素而影响其光合作用,且桐花树能适应一定程度的遮光环境.     

蝴蝶兰组培快繁的应用研究

以蝴蝶兰的叶片、花瓣、花梗、花梗顶芽和腋芽为外植体,通过组织培养方法诱导原球茎和丛生芽。结果表明,花梗丛生芽诱导率为80%,且腋芽的萌动反应优于顶芽。     

珍稀植物鹅掌楸组织培养与离体快繁技术研究

鹅掌楸是优良绿化与优质用材的野生珍稀植物之一,采野生多年生植物的冬芽为外殖体,以春芽、叶片、叶柄、花蕾和果实作对照,用MS为基本培养基,以1/2MS作对比,研究鹅掌楸的组织培养快繁技术。结果表明,初代培养最适为:MS 2.5 mg/L6-BA 1.0 mg/L IBA 0.2 mg/L KT,增殖与继代培养最适为:MS 1.0 mg/L6-BA 0.5 mg/L IBA;将组织培养苗扦插在有机腐殖质土和珍珠岩(3:1)基质中,瓶外生根率达83.3%以上。     

云南省烤烟新品系生物学表型特征分类及区域适应性研究

为准确地鉴定烤烟新品系在寻甸烟区的适应性以及识别其生物学特征特性,旨在为云南省烟草品种的审定和区域化种植提供科学依据．2011年,寻甸试点以MSK326为对照,对供试的6个烤烟新品系采用随机完全区组设计进行了小区品比试验．结果表明：1）在封顶期按照生物学的数量性状可分为3类,第1类（YK01）主要表现为营养生长期长,株高、叶数优势明显,现蕾和中心花开放期明显推迟;第2类（包括云烟112与云烟118）主要表现为株高、叶数有优势,叶片较窄,现蕾至中心花开放的问隔时间延长;第3类（包括云烟117、云烟116和云烟206）与对照相似,主要表现为株高偏矮,有效叶数偏少,营养生长期较短．2）从品种区域适应性看,云烟116适应性最强,大田期烟株生长势强、无高发某一种病害、各项经济指标及原烟外观质量均优于或相当于对照;YK01、云烟112、云烟117和云烟206适应性中等,均需要通过预防某一种或两种高发病害、研究配套烘烤工艺或者改善栽培措施来提高产质量;云烟118的适应性最差,大田期烟株生长势弱,易发3种病害,现蕾期易缺钾,烟叶落黄速度慢,且烘烤性较差,建议淘汰     

高等植物花发育的分子生物学研究

综合介绍了高等植物花发育的特点、开花诱导途径、花/花序分生组织形成、花器官发育的分子生物学研究。高等植物的开花诱导有四个促进开花的途径:光周期途径、春化途径、自主途径和赤霉素途径。这些途径通过某些整合基因共同调控植物的开花转换,如FT、LFY、SOC1和FLC等。在花/花序分生组织形成过程中,LFY、AP1等基因发挥着重要作用,它们是花/花序分生组织特异基因。花器官的发育由A、B、C、D、E等五类基因控制,它们调控着花萼、花瓣、雄蕊、心皮的发育。     

不同室内环境的光照变化与花卉应用研究

测定不同室内环境的光照强度,观察光照的动态变化,为室内花卉的应用提供理论依据。结果表明：居室内光照强度范围为3054-16123 Lx,较适合阴性花卉的应用;实验室内光照强度范围为3944-17420 Lx,较适合阴性花卉和半阴花卉的应用。     

夏目漱石《明暗》中“明暗双双”的世界

夏目漱石曾用“明暗双双”来指代其遗著《明暗》的小说世界。“明暗双双”本是一个禅语,为“明中有暗,暗中有明,二者交融”之意,这也是小说《明暗》的最大特点。二元对立统一的辩证关系贯穿《明暗》的始终,其既是意义范畴上的,也是创作方法上的。“清子”意象的塑造把“明”与“暗”的二元对立统一起来,暗示了近代人精神救赎的困难。     

Rapid in vitro propagation of medicinally important Aquilaria agallocha

Aquilaria agallocha can produce fragrant agarwood used for incense, traditional medicine and other products. An efficient plant regeneration system was established via organogenesis from shoots developed from seedlings ofAquilaria agallocha. Shoots generated many buds on MS medium supplemented with 1.3 μmol/L BA (6-benzylaminopurine) in the first 7 weeks, and the buds elongated on MS medium with 1.3 μmol/L BA+0.5 μmol/L NAA (naphthaleneacetic acid) in another 7 weeks, 2.3 shoots 2 cm in length per explant were obtained within 14 weeks. Plantlets were rooted on 1/2 MS medium after being immersed in 5 μmol/L NAA for 48 h, 96.7% of the roots grew up two weeks later. All plantlets that survived acclimatization grew well in the pots. Project supported by the National Natural Science Foundation of China (No. 30070066) and the Science and Technology Project of Guangzhou City (No. 2003J1-C0241), China