Abstract:The metabolic bases of tiller growth of large-spike and multi-spike wheat cultivar were comparatively studied.The results indicated that,compared with multiple-spike cultivar,large-spike cultivar with fewer tillers per plant had lower activity of indole a

Abstract:The coupling effects of water and fertilizer on the relative penetrability of cell membrane of winter wheat leaf were studied under field condition.The results showed that the cell membrane penetrability of winter wheat leaf was low before winter and high

Abstract:不同形态的氮素 (NO- 3 和 NH+ 4 )培养对 2组产量水平相近而蛋白质含量有较大差异的 4个小麦品种幼苗叶绿素荧光特性在不同的测定光强下产生不同的影响 :低光强下 ,NH+ 4和 NO- 3 培养的幼苗 Fv/Fm在品种间和处理间均无明显差异。饱和光强下 Fv/Fm下降 ,下降程度 CK>NH+ 4 >NO- 3 ,NH+ 4 处理中的 Fv/Fm与 CK差异达到显著性水平 ;NO- 3 处理达到极显著水平 ,对同产量水平的品种来说 ,Fv/Fm下降的程度低蛋白品种高于高蛋白品种。低光强下各品种的 ΦPS CK>NH+ 4 >NO- 3 ,而强光下的变化趋势正好相反 ,NO- 3 处理的 ΦPS 最高。在这两种光强下 ,NH+ 4 处理的 ΦPS 与对照相比 ,差异达到显著性水平 ,而 NO- 3 处理达极显著水平。差异显著性分析表明 ,不同形态的氮素对光系统的影响和作用是不同的

Abstract:Pot experimental method was used to measure water used,water using efficiency,competitive ability and seed yield of two spring wheat varieties-the landrace Monkhead and modern variety Longchun-8275 under five soil water levels both in monoculture and in m

Abstract:varieties (lines) of wheat(T.aestivum L.) which were grown under different soil moisture conditions were studied.The results showed that there were three root patterns in the experimental materials based on clustering analyses for root morphology traits o

Abstract:To obtain salt-tolerant tomato tissues,NaCl of different level was added into the culture medium.Hypocotyl derived calli tolerant to NaCl were selected in vitro and regenerated into plants.The salt tolerance of mutants derived from progressive increase of

Abstract:采用 He- Ne激光辐照对增强 UV- B辐射后小麦幼苗的损伤修复作用进行了研究。小麦种子在盛有湿滤纸的培养皿内 2 5℃下进行萌发。萌发后小麦幼苗在光合有效辐射 (PAR)为 2 2 0 μmol· m- 2 · S- 1的光背景下 ,经 1 0 .0 8k J·m- 2 · d- 1的增强 UV- B辐射 ,然后再用 5m W· mm- 2的 He- Ne激光进行辐照。通过小麦幼苗丙二醛 (MDA)、抗坏血酸 (As A)、超氧化物歧化酶 (SOD)和紫外吸收物含量及活性的变化 ,测定了 He- Ne激光对小麦 UV- B损伤修复的作用。结果显示 ,MDA、SOD、As A和紫外吸收物的变化同小麦幼苗损伤修复的能力相关联。He- Ne激光辐照可使 UV- B辐射后小麦幼苗 MDA的含量明显减少、As A含量明显增加、SOD活性增强及紫外吸收物含量显著增加。说明增强 UV- B对小麦幼苗生理水平的辐射损伤 ,能够被一定剂量的 He- Ne激光辐照而得到部分修复。但是 ,采用同等波长和功率的红光照射 ,其 MDA、SOD、As A和紫外吸收物均无明显变化 ,证明激光的促进修复作用并非由激光的光效应所致

Abstract:以子叶节为外植体,建立起了紫穗槐的快速离体再生系统.经过四周的培养,在附加8mg·L-16-BA的MS培养基上能够获得再生频率为100%,平均每个外植体5.21个芽点的高效再生植株.以再生植株的茎节为外植体所进行的继代能够在相同的培养基上连续的产生新的不定芽,但芽点数要少于起始培养.经过3周的培养,有82.53%切下的再生茎段能够在含2.0mg·L-1IAA的MS培养基上生根.在所有进行分析过的再生植株中,它们的染色体数目都没有发生变异(2n=40).经过练苗以后,再生植株成功地定植于土壤当中并展示了一致的外部形态和生长特性.

Abstract:The level of lipid peroxidation and changes of activited oxygen scavenging system in two maize species with different drought resistance were studied.The results showed the activities of POD?CAT?APX?GR were obviously increased under light water stress,whi

Abstract:将1mmol/L草酸（pH=6.0)加入到4种难溶性含磷化合物（FePO4、CaHPO4、AlPO4和磷矿粉）的水溶液中，其溶出磷的含量均显著提高，溶磷量随着反应时间的延长首先增大，然后有所下降。水培条件下大豆利用磷矿粉中磷的能力很差，加入1mmol/L草酸（pH=6.0)能促进大豆对磷矿粉中磷的吸收利用，表明草酸可能通过螯溶磷矿粉中的磷而提高了其有效磷的含量。200μmol/L铝离子能显著抑制大豆根的生长，而60μmol/L草酸能基本解除其抑制作用。

Abstract:Pot-cultured seabuck thorn seedling's growth,photosynthesis and water relations under soil water stress were researched.The main results showed that:transpiration rate (Tr) declined with the deepening of soil water stress,while the diurnal change of Tr ha

Abstract:Under the condition of trough culture with rain-proof shelter,the effects of different soil water treatment on flag leaf senescence of different drought-endaring wheat cultivars were studied.The results showed that,with the decrease of soil water,the cont

Abstract:The effect of HCl gas released from the plastic products under high temperature and strong light on photosynthetic pigments,photosynthesis,growth and biomass of soybean plant grown in the field were investigated.With the increase in concentration of HCl g

Abstract:Using Ipomoea batatas(L.)Lam. CV Lushu7 and Xushu18 as materials,changes of soluble carbohydrate content,ATP content,ATPase activity and ABA(Abscisic acid)content in storage roots during the thickening stage of storage roots were studied.The main results

Abstract:The results of experiment were that the contents of ABA?IAA?GA 3?iPA and ZR all appeared evident changes from cotyledon outspread to be in bud.Further more,those endogenous hormones appeared the most evident changes when flower buds began to differentiat

Abstract:Ultrastructure and ATPase activity in the intine both K-77(2) (K-type cytoplasmic male sterile line) and 77(2) (maintainer line) were comparatively studied using transmission electron microscopy and ultracytochemical localization of ATPase.The results sho

Abstract:species of genus Calligonum were analyzed using random amplified polymorphic DNA (RAPD) markers.To assess the relationships among species,16 random decamer oligonucleotide primers from Sangon were used for polymorphic selection.A total of 45 bands amplifi

Abstract:研究从繁殖生态学的角度对高寒草甸小嵩草（Kobresia pygmaea)种群进行了初步研究。结果表明：小嵩草属寒冷中生密丛短根茎地下芽植物，在高寒生境中采用以营养繁殖为主、有性繁殖为辅的繁策略，具体体现在以下几个方面：虽然小嵩草种子产量达4553.8粒／m^2，但种子萌发率较低，室内和野外萌发率分别仅有4％和1％，经氢氧化钠溶液和赤霉素溶液处理后的种子萌发率分别为1％和2％，而削去种皮后种子萌发率达52．6％，种皮坚硬是造成种子萌发率低的主要原因；进入种子库、保留至返青期且具有活性的种子仅占种子总数的24．35％，其室内萌发率仅有3％，而在野外理论实生苗仅为11．09个／m^2，与此相反小嵩草营养繁殖所形成的新个体数为6256．25个／m^2，远远多于种子萌发所形成的实生苗数。此外，小嵩草营养繁殖效力也远高于有性繁殖效力，营养繁殖效力占总繁殖效力的90．92％。

Abstract:对新疆阜康绿洲荒漠过渡带植被，分别采用重要值、盖度、多度计测了9种物种多样性指数，并进行了对比分析。结果表明：①对新疆阜康绿洲荒漠过渡带植被类型，以重要值和盖度为测度指标优于多以度为指标计测群落多样性指数；②对9个指数的主成分分析（PCA）表明，3个多样性指数中，Shannon-Wiener指数受丰富影响最大，其次是McIntosh指数，而Simpson指数与丰富度关系较远。

Abstract:Based on 452 specimens and samples collected from seven karst caves in England from 1998 to 2000,the floristic characteristics of the bryophytes of karst caves including (1) the bryoflora consist of 65 taxa in 41 genera and 20 families;(2) The phytogeogra

Abstract:湖南省南岳种子植物属的成分主要是泛热带、北温带和东亚3种分布区类型，分别占总属数的22．6％、18．8％和14．9％，温带和热带2种性质分子比例相当，分别占47．5％和52．5％；其种的区系成分主要由华夏、东亚、中国－日本和华东－华中等4种分布式样构成，分别占总种数的24．47％、16．60％、14．17％和11．65％，若扣除分布范围较广的世界广布、旧世界热带、热带亚洲至热带非洲、热带亚洲至热带澳洲、热带亚洲、南北温带（全温带）、北温带、东亚、中国－喜马拉雅、中国－日本和华夏等11种式样，则“华东－华中”及其邻近分布的式样共计177种，占剩余总种数（287种）的61．67％，说明南岳种子植物区系具有典型的“华东－华中”过渡色彩。数量分析结果表明，南岳植物区系与庐山的关系十分密切，南岳在区系归属归于华东植物地区比较恰当。

Abstract:In this paper,bryophyte life forms of Sangong River Valley are reported.The bryophyte life forms there can be grouped into 6 types which are errantia,epipetria,epiphytia,hydro-radicantia,meso-radicantia and dry-radicantia types,out of which the species of

Abstract:Two species of the genus Plagiobryum Lindb.(Bryaceae),P.demissum (Hoppe & Hornsch.) Lindb.and P.zierii Lindb.are reported for the Tianshan Mountain of Xinjiang,China.Description,illustration and a key for identification for them are provided based on the

Abstract:从野生真菌耳状网褶菌（Paxillus pamuoides Fr.)子实体中分得4个化合物，经光谱和化学方法分别鉴定为（2S，3S，4R，2′R）-2－（2′－羟基二十四碳酰氨基）十八碳－1，3，4－三醇（1）、5α，8α－表二氧－（22E，24R）－麦角甾－6，22－二烯－3β-醇[5α,8α-epidioxy-(22E,24R)-ergosta-6,22-dien-3β－o1,2]、（22E，24R）－麦角甾－4，6，8（14），22－四烯－3－酮[(22E,24R)-ergosta-4,6,8(14),22-tetraen-3-one,3]和对羟基苯甲酸乙酯（ethyl 4-hydroxybenzoate,4)。其中化合物4作为天然产物属首次报道。化合物1－4为本科真菌中首次分得。

Abstract:对槐豆胶与黄原胶的协效性进行了研究，结果表明，槐豆胶和黄原胶有较高的协效性，其最佳配比（重量比）为2：8；当混合液浓度达到0.5%-0.6%时形成凝胶，因此槐豆胶可作为黄原胶的增稠剂和凝胶剂。

Abstract:Mitigative effect of salicylic acid on salt stress-induced growth inhibition of cucumber seedling and its machanism were studied.The results showed that,under salt stress,salicylic acid could increase the relative water content of seedling,decrease the tr

Abstract:在40g/L蔗糖＋50mg/L SA 100mg/L Vc的保鲜液中，加入37μS/cm的长安麦饭石（CHMS），能更好的保持月季切花较高的吸水能力，增强切花花朵膜损伤修复能力，增大花朵开放直径，增加盛开前花枝的鲜重，提高切花瓶插期的观赏品质，延长瓶插寿命。本试验也证明了水杨酸（SA）与8－羟基喹啉（8－HQ）对月季切花有相似的保鲜效果。

Abstract:以MS+6-BA0.2mg·L-1+GA1.0mg·L-1为增殖基本培养基,分别附加不同浓度的PP333及CCC,其中10mg·L-1PP333及70mg·L-1CCC对香椿试管苗增殖生长有促进作用,尤以10mg·L-1PP333效果最好,同时可减轻玻璃化及愈伤组织发生;以1/2MS+IBA1.0mg·L-1为生根基本培养基,分别附加0.1mg·L-1PP333及10mg·L-1CCC,对试管苗生根壮苗有促进作用,而10mg·L-1CCC最适宜,小苗移栽成活率高.

Abstract:探讨了不同烫漂和干制方法对苋菜和荠菜中 β-胡萝卜素、抗坏血酸和叶绿素含量的影响。结果表明 ,用 93℃± 2℃的偏亚硫酸氢钾烫漂 1 min,以上化学成分保存率最高。低温干燥能最大限度地保存干制品中的 β-胡萝卜素、抗坏血酸和叶绿素

Abstract:Fluorescence in situ hybridization (FISH) technique is a most effective method of detecting alien chromatin at molecular level.The main probes used in this technique are chromosomal repeat sequences,genomic DNA,oligo-or single copy sequence(s) and chromos

Abstract:杂草与农作物竞争阳光、水分和营养物质，造成农作物减产；化学除草剂的过度使用引发了严重的生态后果；杂草还可能从近缘的转基因作物中获得某些抗性性状，转变成“超级杂草”，这些都增加了杂草管理的难度及复杂性。近年来应用先进的分子生物学及基因工程技术，人们已分离出许多目的基因，如各种器官或组织特异性启动子、细胞毒素基因、可提高作物活力的优势基因及异株克生化合物生物合成途径的关键基因等。运用这些基因可建立杂草综合管理的新策略：①向作物中导入“终止因子”或开花抑制因子，当作物与近缘杂草杂交后，所形成的后代变成一种“自杀杂草”而不能存活；②控制某些性状的基因对作物是有益的或中性的，而对杂草是有害的，将这些杂草的“不适应因子”基因导入作物后，作物与杂草杂交产生的后代将缺乏竞争力和适应性，同时这种“不适应因子”在杂草群体中传播又可造成整个杂草种子库的衰减；③通过遗传工程改良各种生物控制剂，如特异性侵染杂草的细菌、真菌病毒、昆虫等病原物，从而可直接将杂草杀死或降低其适应性；④将一些能增加作物活力和部分力的优势基因导入作物中，可促进作物更有效地与杂草竞争；通过遗传工程改良那些能专一性地促进作物生长的微生物也会增加作物的竞争力；⑤利用异株克生现象，开发能抑制杂草生长的作物品种，并采用转基因技术将控制异株克生化合物产生的全套代谢途径或某一关键步骤导入目标作物中，可提高作物的异株克生潜能。这些新策略的实施，将运用分子标记及其辅助育种、基因图谱克隆、基因沉默以及基因芯片技术等DNA操作技术。

Abstract:This review summarizes recent advances in understanding the fate of chlorophyll in senescent leaves.structures of end-and intermediate products of degradation as well as the catabolic pathway are described.The intracellular localization of the catabolic p

Abstract:The Chinese bryologists have produced up to 800 bryological articles and 25 books since 1930.The present status of bryological research in China and progress made by the Chinese bryologists were summarized.Bryophytic chemistry and molecular biology of bry

Abstract:The development of the oil cell in Liriodendron chinense(Hemsl.)Sargent.was distinguished into three stages according to the ultra structural changes of the cell wall.Stage 1,only the outer primary cellulose wall layer is present.Stage2,a suberin layer is