Abstract:自然条件下晴天银杏叶片光系统Ⅱ光化学效率表现明显日变化。上午Ｆｖ／Ｆｍ随光照的增强而降低，至１４：００左右达最低值。其后随着光强的减弱Ｆｖ／Ｆｍ缓慢恢复。一天中叶黄素循环关键组分玉米黄质（Ｚ）含量与Ｆｖ／Ｆｍ呈负相关，用二硫苏糖醇（ＤＴＴ）阻断Ｚ的形成后，光抑制程度大大加深。结果表明与叶黄素循环有关的非辐射能量耗散的增加是产生光抑制的原因之一。强光处理前饲喂Ｄ１蛋白合成抑制剂林可霉素（ＬＭ），ＦＶ

Abstract:he effects of controlling irrigation on endogenous hormone content and grain filling rate of wheat under rain proof condition in wheat had been studied and the results were as follows:with the increase of controlling wate

Abstract:his paper studied the inoculated effects of VA mycorrhizal fungus ( Glomus mosseae ) for plants (maize,mungbean,white clover,peas,soyabenas,paprika) and VA mycorrhizal fungi ( Glomus mosseae,G.caledonium,G.sp.,Sclerocystis sinuosa

Abstract:he comparison studies of leaf senescence metabolism character and grain weight change in winter wheat ( Triticum aestivum L.) were investigated under late sowing condition.The seven winter wheat cultivars were divided into three types such as the late

Abstract:Changes in respiraton,firmness,pectic substances and membrane permeability of Huoshi and Shuishi ( Diospyros kaki L.) fruits during ripening were studied in this paper.The results showed that the postharvested respiration variations of Huoshi and Shuis

Abstract:The xerophilous groups of Astragalus consist of 2 subgenera with medifixed hairs,Subgen. Cercidothrix Bge.and Subgen. Calycocystis Bge.,which are considered more advanced than those with basifixed haris.Species from the

Abstract:There are 1792 species seed plants belonging to 730 genera in 146 families in the floriestic region of Changqing National Reserve.Based on the statistics,the results as follows:(1) It is richer in number of seed plants w

Abstract:在研究标本和文献的基础上，报道了新疆产木灵藓科植物３属１４种，即：瓶藓属Ａｍｐｈｉｄｕｉｍ（１种），木棂藓属Ｏｒｔｈｏｔｒｉｃｈｕｍ（１２种）和木衣藓属Ｄｒｕｍｍｏｎｄｉａ，对它们的生境、识别特征和地理分布作了初步讨论，并编制了新疆木灵藓科植物的分属、分种检索表。

Abstract:通过研究我国蕨类植物特有种中华卷柏在现代植被中的分布及其化包子在地层剖面中的时空分布规律，并阐明了中华卷柏在现代植被分布域具有连续分布的特征。在生境上，其基本生活在具有石灰质成土母质的土壤上，多生长在山坡阴处岩石上、山顶岩石上，向阳山坡石缝中，山坡灌丛下等，是一种土壤生态类型植物。在热量和水分因子上，中华卷柏生长在温度适中的黄；多在较为湿润的地方生长。数值分析进一步表明中华卷柏的空间分布主要受年平

Abstract:uzzy cluster analysis was applied to solve the taxonomic divergence on the dividing line among genera of Chinese Angelicinae according to the information from morphology and pryolysis gas chromatography analysis.In the aspect of morphology,the affinity re

Abstract:he present paper reports the karyomorphological data of 5 species of Swertia .The karyotype formulae are as follows: S.teraptera 2n=14=4m+8sm+2st=2L+6M 2+4M 1+2S; S.wolfangiana 2n=28=12m+14sm+2st=6L+8M 2+8M 1+6S; S.bifolia 2n=28=14m+4sm+10

Abstract:Being abountant in repeated DNA sequenses is one of the most significant features of the higher plant nuclear genomes,thus,they are important target in constractural and functional analysis of the plant genomes.Some categori

Abstract:he transport of photoassimilate in higher plants was mainly affected by the development of vascular bundle, sometime limiting crop production,and the distribution of assimilate among sink organs was mainly determined by the characteristics of sink itself.

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Abstract:应用“铸模”扫描电镜法和组织切片技术对水稻幼穗的形态发生过程和顶端分生组织（ Ａｐｉｃａｌｍ ｅｒｉｓｔｅｍ ）进行了系统而细致的研究。研究表明：从营养生长转入到生殖生长早期，水稻生长锥发生了显著的变化，根据苗端分生组织（ Ｓｈｏｏｔ ａｐｉｃａｌｍ ｅｒｉｓｔｅｍ ， Ｓ Ａ Ｍ ）中原基分化的属性，将水稻幼穗早期起源和发育过程分为花序顶端分生组织期（ Ｉｎｆｌｏｒｅｓｃｅｎｃｅ ａｐｉｃａｌ ｍ ｅｒｉｓｔｅｍ ｐｈａｓｅ， Ｉ Ａ Ｍ Ｐ）、小穗顶端分生组织期（ Ｓｐｉｋｅｌｅｔ ａｐｉｃａｌ ｍ ｅｒｉｓｔｅｍ ｐｈａｓｅ， Ｓ Ｐ Ａ Ｍ Ｐ）、花顶端分生组织期（ Ｆｌｏｒａｌ ｍ ｅｒｉｓｔｅｍ ｐｈａｓｅ， Ｆ Ｍ Ｐ）。在这 ３ 个大的发育时期，又根据每一发育时期中的原基分生组织生长发育的程度及先后顺序分别又可分为：花序 ０ 期、花序Ⅰ期、花序Ⅱ期；小穗期Ⅰ期、小穗Ⅱ期、小穗Ⅲ期；内稃原基分化期、浆片原基分化期、雄蕊原基分化期、心皮原基分化期。同时，在研究过程中还发现了一些与前人所不同的形态发生特征，并初步探讨了水稻幼穗早期的起源及分化发育的机理。

Abstract:分析了植物快繁中影响有效繁殖速度的各种参数，在此基础上推导出了有效快繁速度（ Ｖ）和商品苗总产量（ Ｙｔ）的计算公式，即 Ｖ＝ Ｙ／ Ｎｐ ＝ ［ｎ· Ｃｒ＋ １ － （ｎ－ １）· Ｃｒ－ １］·ｆ； Ｙｔ＝ Ｂ·（ Ｃ－ １）·ｆ ·ｎ。利用这套参数及公式作为技术指标，既可评定特定快繁系统间的差异，又可实现对快繁系统的调控和量化组织管理，提高快繁效益。

Abstract:The investigation and determinations were conducted throughout growth season in two kinds of natural grassland: Artemisia gmelinii community and Stipa bungeana community in Ansai,north Shaanxi.The comparative studies were explicated from soil moist

Abstract:培养球茎甘蓝（ Ｂｒａｓｓｉｃａ ｃａｕｌｏｒａｐａ）的带有花托、花柄和子房的外植体。在附加 Ｂ Ａ 和 Ｇ Ａ３ 的培养基上，花托部位直接出芽；在附加不同浓度 Ｂ Ａ 的培养基和附加 Ｂ Ａ 和 Ｇ Ａ３ 的培养基上均诱导花柄切口直接出芽，在附加 Ｂ Ａ 和 Ｎ Ａ Ａ 的培养基上，花托花柄切口剧烈增生愈伤组织。组织细胞学观察了芽的发生过程，结果表明：花托芽是由靠近维管束的多个皮层薄壁细胞恢复分裂能力形成，并与母体建立维管联系；花柄切口出芽是由皮层几个相靠近的薄壁细胞恢复分裂能力共同形成，与母体没有维管联系；花托增生愈伤组织也是皮层薄壁细胞剧烈分裂的结果。

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Abstract:Under glasshouse conditions,pot cultural experiment was conducted to seek critical phosphorus concentrations of wheat genotypes with phosphorus efficiency andinefficiency.The results indicated that,P inefficient genotype was much more sensitive to phosph

Abstract:Based on the cloning of a drought tolerant gene HDCS1 ,which is one of the group 3 LEA cDNA,a plant expression vector pBHC was constructed for this gene.In pBHC the fragment of HDCS1 was ligated downstream to CaMV

Abstract:以冀麦２４和其耐盐的一代８９０１－１７为材料，用ＲＡＰＤ技术对其进行比较分析研究。在的用的２１５个引物中有５１个扩增出多态性，既有量的差异又有质的差异，初步断定此５１个引物扩增出的多态性与突变有关，为进一步用ＢＳＡ方法细筛出与耐盐突变体紧密连锁的ＲＡＰＤ分子标记下打下基础，同时，还分析了影响ＲＡＰＤ扩增结果的因素。

Abstract:he studying,using mainly cotton caltivars in China,researched the influence of the explant materials,bacterium concentration,the time infused by bacterium,antibiotic etc.to the agrobacterium mediated efficiency of genetic transfor

Abstract:甘蓝型油菜与芥菜型油菜杂交研究结果表明，杂交结实力与杂交组合方式以及参与杂交的亲本材料有关，以芥菜型油菜作母本的杂交结实力高于以甘蓝型作母本的组合：芥×甘杂交组合的平均结实数／花为 ２．６４ 粒，而甘×芥杂交组合的平均结实数／花为 ０．１０ 粒。芥甘杂种一代形态特征和生育期介于双亲之间，甘芥杂种一代不表现整齐的中间类型，株间差异明显；总体来看，芥甘杂种一代与双亲回交的结实力（０．４０，０．２１）低于甘芥杂种一代与双亲回交的结实力（３．３０，１．７４），无论是芥甘杂种一代还是甘芥杂种一代，用甘蓝型油菜作父本回交的结实力高于用芥菜型油菜作父本回交的结实力，但也有个别回交组合出现例外，不表现上述规律。 Ｂ Ｃ１ 代种子当年播种出苗率低（１８．５％ ），群体株间性状差异明显，生育期极不一致。芥甘杂种一代与甘蓝型油菜亲本第二次回交，其平均结实数／花较回交一代提高 １．０８ 粒， Ｂ Ｃ２ 代种子当年播种出苗率仍较低，但较对应的 Ｂ Ｃ１ 代稍有提高，群体中出现趋回交父本性状但雄性育性彻底退化的植株。芥甘杂种一代自由授粉所得 Ｆ２ 群体是一个变异极为丰富的遗传群体。

Abstract:Morphological changes during initiation and development of axillary buds and cormels in monocorm and multi corm taro were studied.Protein content in the top andaxillary buds at different developmental stages was analyzed.Results showed that while there w

Abstract:研究了不同浓度水杨酸（ＳＡ）对马铃薯脱毒试管苗生长，分化及试管微薯诱导和发育的 浓度ＳＡ显著抑帛式管苗主茎和根的生长，促进侧枝和匍匐茎分化。高浓度（０．１－１．０ｍｍｏｌ／Ｌ）ＳＡ能诱导试管微薯形成并显著提高结薯率。ＳＡ浓度为０．５ｍｍｏｌ／Ｌ时，结薯率最高，且成薯集中，薯块大小整齐一致。

Abstract:ell walls and plasma membranes of young infected cells are smoother in vicia sativa root nodules.On the contrary,the thickness of cell walls are not same and there are more plasmodesmata in them,the plasma membranes often

Abstract:ffects of boron deficiency on structure and nitrogenase activity of soybean plants [ Glycine max (L.) Merr] were studied.Examination of structures of nodules from the plants grown in nutrient solution without boron showed

Abstract:The leaves of the Silene fortunei beared a type of mucilage hair,which was an uniseriate glandular hair with 3 cells.With the help of a transmission electron microscope,the ultrastructure changes of the glandular hair were studied.The results are as f

Abstract:Comparative observations were made on the morphology and anatomy of secretory cavities in stems of 14 genera,23 species and one varieties by paraffin and thin section method.Secretory cavities were distributed in the cortex beneath the epidermis.A secreto