Abstract:Eight new-born Chinese buffalo were used for cytoarchitectural observation of thespinal gray matter in the present study.The structural features of the spinal gray matter inthe intumescentia cervicalis were demonstrated and the exact site fo the spinal intumescentiacervicalis of the Chinese buffulo was determined to be on C3-T2.These results suggested thatthe exact site of the intumescentia cervicalis differed between the Chinese buffalo and the In-dian buffalo or other animals.The relationship between the structural features of the spinalgray matter and the exact site of intumescentia cervicalis were discussed.

Abstract:There groups of 20-day-old SPF chicks raised in isolators were vaccinated by ocu-lar instillation and oral administration with three batches of IBD BK912 lyophilized vaccinerespectively.Booster was carried out 2 weeks later with the same method.Two weeks afterthe booster,one control group and three vaccinated groups were challenged with 100BID501084A strain.Results showed 100%morbidity for the control group and 100%protectionfor the vaccinated groups.Determination of bursa index as well as protection test reveal thatthe vaccine was safe and did no harm to the bursa.

Abstract:In addition to macroscopic inspection and conventional staining,histochemicaltechnology and scanning electron microscopy were used to observe sequential morpholog-ic changes in the IBD immune process and further our knowledge of IBD.The resultsshowed that IBD vaccines of medium virulence should preferably be selected for use in areaswhere IBD was prevalent.Whether the damaged bursa would be repaired depended on thefollowing two factors:portion of lymphoid tissue remaining after damage to the bursal lym-phfolliculi,and whether or not the regeneration of the bursa occurred before bursa involu-tion.

Abstract:This experiment was conducted observe,through electron microscopy,the struc-tural changes in the integument and mid-gut of the silk worm fed with fluoride.The resultsshowed various degrees of damage in the integument and mid-gut.Vacuoles appeared inthe epithlium of the integument and precipitates appeared in the outer epidermis in some se-vere cases.The pathological changes in the mid-gut were more obvious:the structure of thecell layer became loosened,the cell vacuolated,the mitochondria void,the endoplasmicreticulum swollen,the nuclear membrane degenerated and the nucleoplasm agglomerated.The mechanism of the fluoride poisoning to the silk worm was discussed in relation to pro-viding scientific basis for the control of air pollution in sericulture production.

Abstract:生物活性初筛试验表明，肉桂精油是优良的谷物保护剂。采用０．１％～０．２％（ｗ／ｗ）的浓度处理小麦或麦粉，能有效地抑制玉米象、谷蠹和赤拟谷盗的种群繁殖。每头黄粉虫幼虫点滴０．１－０．５μＬ肉桂油，明显影响其生长发育和水分代谢。采用ＧＣ－ＭＳ方法分析了肉桂油的化学成分，活性跟踪试验表明，肉桂醛为肉桂油的主要杀虫有效成分。

Abstract:从籼型水稻品种中鉴定、筛选出７个不同抗级的抗白叶枯病基因源，加入高感病标准品种ＴＮ１，作８×８完全双列杂交，按Ｈａｙｍａｎ模型进行遗传分析，结果是：在遗传方差中，加性方差占７５．２４％。显性方差占２０．３６％，上位性方差占４．２２％；广义遗传ｈ＾２Ｂ＝９７．９８％，狭义遗传力ｈ＾２ａ＝７３．９０％；最小加性基因数ｋ＝４，显性基因数ｋ＇＝４；具不完全正显性，所有显性座位的作用方向相一致，不同显性座位

Abstract:A new bacterial disease,tobacco black rot was found for the first time in Ruyuancounty Guangdong province. According to the studies on the majar bacteriologic characteris-tics and host range of the pathogenic bacteria,the causal organism was identified to be anisolate of Xanthomonas campestris PV. raphani(white)Dye.

Abstract:本文描述了在广东省深圳市光明农场的梨树根际土中采集到的头刃线虫属一新种，凹头刃线虫。该新种以阴门向体内凹陷，具有较大的外唇和较小的内唇区别于头刃线虫属中的其他种，此外，该新种是这个属中第二个具有４条侧线的种群，该新种在侧线数、体长和口针长等特征上与印度头刃线虫相似，它们的区别除了阴门特征外，在头部、阴门侧膜、卵巢、后阴子宫囊以及尾长等特征上也存在着明显差异。

Abstract:本文根据白背飞虱自然种群生命表及捕食性天敌对白背飞虱种各虫态的捕作用讨论捕食性天敌对白背飞虱种群的控制作用，得到如下结果：捕食性天敌是影响白背飞虱种群密度的生要因子。白背飞虱种群动态应用状态方程描述。经计算白背飞虱各虫期在排除捕食性天敌作用后的存活率估计状态方程系统矩阵的元素值，由捕食性天敌作用所导致的死亡率估计得到捕性天敌控制作用矩阵各元素值，把模型模拟值与田间实测值作比较可见：在水稻分蘖期两者

Abstract:The Angoumois grain moth(AGM),Sitotroga cerealella Olivier ,severely infes-ed the stored grain of hybrid rice ,of which the susceptibility ratio was larger than the regu-lar rice.Because the hybrid rice usually had high percen tage of gaping glumes ,the newlyhatched larvae of A GM easily penetrated into the seeds.Highly significant positive correla-tion(P<0.001) between the percentage of gaping glumes and the emerging adults ,orgrain loss was found,and a significant positive correlation(P<0.05)between the gapingglumes and susceptibility index also existed. The percentage of gaping glumes increased withsusceptibility increasing and vice versa. The cytoplasmic male sterility(CMS)line susceptibleto AGM was the major factor affecting the susceptibility of hybrid rice.Development of thenew resistant CMS or restorer line with the resistance controlled by dominant gene could in-crease the resistance of hybrid rice to stored insects.

Abstract:The present study was carried out by using bagasse as the cultivated materials.After fermentation in piling ,the materials could be used to cultivate an edible fungus Pleuro-tus sa jor-caju successfully. The result which was obtained from the repeated experimentsshowed that the mycelium of Pleurotus sajor-caju grew vigorously and thickly,and had astrong vitality in the bagasse medium that mixed with a small quantity of wheat bran and aproper quantity of mud powder.This method used to cultivate Pleurotus sajor-caju wasproved to be simple and effective. By means of this method ,the edible fungus could have ashorter period of growth and higher yield,174kg of reesh mushroom from 100kg of cultivat-ed materjals.

Abstract:以籼稻品种秋桂矮１１发芽种子的功芽基部为外植体，以Ｎ６培养基附加２，４－Ｄ２ｍｇ／Ｌ和脯氨酸０－４０ｍｍｏｌ／Ｌ诱导愈伤组织，对愈伤组织进行了立体解剖，扫描电镜观察和ＧＭＡ塑料薄切片观察。结果表明，愈伤组织可分为胚性、中间型和非胚性３大类，胚性愈伤组织与非胚性愈伤组织在外观特征和内部结构方面都存在显著差异，前者明显分化成６类细胞，其中包括传递细胞；后者分化程度低，且没有观察到传递细胞，中间型愈伤组

Abstract:The effects of four NK treatments on nitrate reductase(NR)activity ,nitrate ni-trogen(NO3-N)content of leaves and curd yield in cauliflower were studied.The results in-dicated that N8K10 treatment resulted in better plant growth ,the highest curd yield and perunit leaf area curd productivity as compared with the other treatments which decreased inthe order of N8K5,N16K10,N16K5.The NR activity in leaves was higher during the curd for-mation ,while lower before flower bud differentiation and at curd harvest.The NR activityin leaves increased gradually form low to high nodes.The change trends of NO3-N contentof leaves were the same as the NR activity NK interaction caused marked effects on NR ac-tivity and NO3-N content of leaves.High N treatment could promote NR activity and de-crease NO3-N content.When N level was lowet , high K treatment could enhance NR ac-tivity and decrease NO3-N content.When N level was higher,high K treatment could de-crease NR activity and increase NO3-N content. There were no significant correlation be-tween NR activity in leaves of various growth period and curd yield.

Abstract:番茄圆纹病分生孢子在２０－２５℃温度下在水中需要４－６ｈ才开始萌发，病原菌大多数从气孔侵入，也可以从表皮直接侵入。病原菌菌丝在叶片栅栏组织中以纵向扩展为主，而在海绵组织中则以向扩展为主，病原菌菌丝在病斑的栅栏组织中集结形成分生孢子器，成熟的分生孢子有孔口的部分突出于病斑上表面。因而病原菌从叶片中表面侵入的机会比下表面大。菌丝在病斑栅栏组织中分布不均匀，使病斑上表现形成轮纹，而在海绵组织中分布较均匀

Abstract:This paper reports studies on the microsporogenesis,megasporogenesis and em-bryo sac development of Ananas comosus(L.)Merr.The cytokinesis of the microspore mothercell in meiosis was of the successive type.The arrangement of microspores in the tetrads waszygomorphic or decuassate.The anatropous ovule was bitegminous and crassinucellate.Themegaspore mother cell gave rise to a linear tetra.The chalazal megaspore became a func-tional megaspore.The development of the embryo sac conformed the Polygonum type.

Abstract:本研究已探索到，连续１０年２０季在只耙不梨的少耕田撒播水稻与在按传统方法犁耙的全耕田撒播水稻相比，每季的稻谷产量都较高，其原因是少耕撒播稻的穗粒性状优于全耕撒播稻，而这种优势的产生则在于少耕法能导致耕作层土壤的物理性质和养分，向着利于根系生长的方向发展，而使少耕稻与全耕稻相比具有较发达与生理活性较强的根系，并进而导致少耕稻在稻苗的长势长相、功能叶的生理活性，以及在延缓功能叶的衰老等方面都优于全耕稻

Abstract:Thirty-six combinations were obtained by crossing eight types of homonucleus-al-loplasmic male sterile lines and their relative maintainer lines with four restorer lines,respec-tively,and the difference of male sterile cytolasmc effects with homonucleus background wascompared under split-plot experiment.The results showed :male sterile cytoplasms werefound expressing mostly negative effects on single plant yield and main agronomic charactersof F1, but a very significant difference was retained among the different cytoplasms.It wasfound that the cytoplasmic effect of O. sativa L.ind ica was better than that ofO.sativa L.f.spontanea in the study,it suggested that O. sativa L. ind ica should be priority for selectingsuperior male sterile cytoplasm. The sterile cytoplasmic effect was certainly affected by re-storer lines and the studied characters were significantly controlled by nucleo-cytoplasmic in-teraction. Therefore,selecting and breeding restorer lines with strong combining ability willstill be an important way for developing superior hybrid combination. The possibility and ne-cessity of selecting superior male sterile cytoplasm in breeding of three lines hybrid rice werealso dicussed.

Abstract:用玉米杂交桂顶１号，于１９８８－１９８９年在广州分期播种试验，结果表明，全生育期长度、株高、惩长、惩粗、产量均受到农业气象条件的影响。全生育期的有效积温和生育期天数分别是１５０９℃和１０１．４天。生育期长短主要由温度因子决定，产量由穗长、穗粗和行粒数决定，试验结果还表明，广州地区玉米的合适播种季节是春季和秋季。

Abstract:kinds of main chenical components of aroma in flue-cured tobacco were identi-fied by GC/MS. Components in cured leaves of different pH value around roots were quanti-tatively determined by GC. The main chemical components of aroma matter gained wereneopphytidiene;nicotine;solanone;benzeneacetaldehyde;1O-isopropyl-3,7,13-trimethl-2,6,11,13-tetradecaen-1-ol;cembratrienes,etc. Contents of aroma chemical components in flue-cured tobacco under different pH value were obviously different.pH value between 6.5 and7.5 was benificial to aroma quality of flue-cured,and pH value above 8.0 had an un-favourable effect on the formation of some important components of aroma matter. In addi-tion,it was possible that pH value around roots influenced aroma character of flue-cured to-bacco.

Abstract:As an effective method to improve the product quality,people are paying more at-tention to quality management.The theory and practice of quality management in enterpriseat home and abroad was reviewed. Some problems on quality management in our countrywere pointed out,and some views on quality management discussed in this paper.

Abstract:The Volatile oil components of garlic stem were researched with GC/MS,and 24sulphur compounds were identified. Among them,1,2,3-trithiane,1,2,3,4-tetrathiepane,methyl allyl tetrasulphide,dially tetrasulphide were newly recorded for the garlic plant,andtheir mass spectra fragmentation pathways were discussed.

Abstract:本文利用薄层荧光扫描法定量测定了柑桔嫩稍叶片中的赤霉酸ＧＡ３。样品经过乙酸乙酯反萃取及ＰＶＰ－硅藻土层析柱后，再径ＸＡＤ－７柱浓缩，在经过１０５℃活化３０ｍｉｎ的硅胶板上，以氯仿－乙酸乙酯－冰醋酸（５：４：１）为展开剂进行展开。用浓硫酸－乙醇溶液（９０：１）显色，在ＣＳ－９３０双波长薄层扫描仪上进行荧光扫描。ＧＡ３的平均回收率为８２．４％，标准偏差为２．８％，最低检出量为５ｎｇ。

Abstract:依据溴和碘的二阶导数光谱，选择２１７．０ｎｍ的Ｉ＾－等吸收点波长和２４２．４ｎｍ的Ｉ＾－吸收峰波长，用于Ｂｒ＾－和Ｉ＾－的同时测定。溴和磺标准混合液测定的误差为：Ｂｒ＾－－０．４８３％～＋０．７１４％；Ｉ＾－－０．４０５％～＋０．９８３％。对２１种离子做了干扰试验。并测定了食盐样品中Ｉ＾－和Ｂｒ＾－的含量，样品中的回收率分别为：Ｂｒ＾－９７．２％～１０１％；Ｉ＾－９９．６％～１０２％。

Abstract:Some nutrient elements in tomato plants at different growing stages were assayedby atomic absorption spectrometry. It was found that the levels of 4 microelements,namelyFe,Zn,Cu and Mn were higher in the root than the corresponding levels in the stem and leafat the seedling,vegetative growth and reproductive stages. The weighted average of Fe con-centration at the seedling stage was far above those for the vegetative growth and reproduc-tive stages. At the vegetative growth stage the weighted average levels of Zn and Cu wererather high whereas that of Mn was the lowest. The levels for the macroelements Mg,Ca,Kand Na were as follows:At all three stages of growth the Ca level of the leaf was higher thanthose of the stem and root,whereas the K level in the stem was higher than those of the rootand leaf. During growth of the tomato plant,the weighted average level of Ca showedgradual incremental increase whereas that of K exhibited incremental decrease. As toMg,for the seedling stage the content was highest in the root,for the vegetative growthstage highest in the stem,and for the reproductive stage highest in the leaf. A certain amountof Na was present also in the plant.