Abstract:Two virus-free garlic cultivar bulbs were obtained after culturing 0.100 -0.125mm long shoot apices on the basal medium of Murashige and Skoog(1962) supplemented with different combinations and different concentration of IAA, 2,4-D, KT. NAA and BA. The effects of these growth regulators and the influences of light and temperature to the callus growth, organogenesis and bulb formtion had been compared and discussed, a set of culturing conditions and media with growth regulators were recommended.

Abstract:According to the survey in the main area producing Dwarf Banana (Musa nona Lour. ) in Cuangdong of China eg. Dongguang, Gaozhou and other counties. We have found that the Dwarf Banana reniform nematode (DRN) is not only widespreadly distributed in the areas, but also has quite great population densities in some places, The DRN has been isolated from 61.4% of 70 samples of the roots and rhizosphere soil. The population densities can be up to 1754 /100 gram, dried soil.The roots of Dwarf Banana were infected only by the young females of reni-form nematode, whose anterior part of the boby eneased in the cortes of the root for feeding. The permenent feeding site of adult female is usually initiated in the near emdodermal cell. The peak of infestation and disease period appeared a from mid April to later May.Reniform nematodes could cause the endodermal cell walls around the infecting site thicking, being broken easily; and also could cause the endodermal,pericycle and vascular parenchymal cells fusing into a syncytium.A species of the major pathogenic neraatodes infected the Dwarf Banana roots was identified to be Rotylenchulus reniformis Linford and Qliveira, 1940,according to its morphological characters, life cycle and host range.

Abstract:Based on the successful transmission and back transmission, Viuca rosea was proved to be a host plant of the yellow shoot BLO. The typical symptom on both sweet orange and Vinca rosea seedlings was shoot yellowings The BLO was found to exist in the phloem cells of the diseased plant of Vinca rosea and sweet orange including the aweei orange plant from which the BLO iras transmitted and to which the BLO was back transmitted!. The BLO was measured to be 360-600 nm in length, 100-120 nm in width, with a unit membrane (or cell wall) of 25-30 in thickness.

Abstract:In this article the situation of continuous development and the severely marketing challenges of the export trade of fresh and live agricultrual products in Dong-Guan city,Guang-Dong province have been comprehensively analyed. According to the international environment and the local condition and the relationship between favorable and unfavorable circumstances, the necessity and possibility of the development strategies of fresh and live agricultural products are testified. In order to reach the target of developing Hong Kong-Macao market aad other foreign market,eight concrete measures have been put for ward.

Abstract:烟草叶面喷施10～100ppm的IAA,光合、光呼吸、CO_2补偿点、乙醇酸合成量、以及RuBp羧化酶/加氧酶和乙醇酸氧化酶活性均提高,而且均随IAA浓度的增加而增高。抗生长素三碘苯甲酸抑制光合和光呼吸,降低CO_2补偿点,降低BuBp羧化酶和乙醇酸氧化酶活性。草甘膦亦降低光合、光呼吸强度和乙醇酸氧化酶活性。亚胺环己酮和放线菌素D亦降低叶片乙醇酸氧化酶活性,并消除由IAA引起的酶活性增强。认为IAA通过提高RuBp羧化酶活性而增强光合作用;通过增加乙醇酸合成和提高乙醇酸氧化酶活性而提高光呼吸。

Abstract:Tangerine (Citras reticutata var.tanoerina Tan.)is a lind of wounderful fruit as edibles, gift and ornament during the Spring Festival in China. It will satisfy the needs of the festival and export if the fruits Are retained with leaves and preserved fresh. It has been proved in this experiment that the fruits can be preserved fresh and retained leaves for 48 days after soaked with the No. 1 mixed fruit preserving agent. The fruits with leaves loaded in bamboo basket in batches and transported 160 km. Still retained their leaves 65-88% for 12 days, and weight loss being 1.19% only. These fruit still looked plump, lustrous, and in good color with green leaves.Sale trails were sought after by customers. The commercialized experiment should be carried out on a large scale in the near future. Experiment with labelled compounds of 32p-NaHPO4, 3H-glucose, 3H-H3O and 14C-2,4-D indicated that the action of exogenous hormone and moisture is the key factor on preserving fresh and retaining leaves of tangerine. Routine analysis carried Out in the preserved fruit revealed that no evident loss of nutrients occurred. The residue of chemicals had been checked by gas chromatography, and the content of batistin was within the limits of international standard, with the exception of one sample treated with 50 Or 200 ppm of 2,4-D, of with showed a little higher than the international standard; but all other samples were lower than the international standard. So it is safe for edibleness.

Abstract:本文研究了在桂油生产中,不同工艺条件对桂油出油率和桂油质量的影响。主要研究了原料状态(切碎与不切碎)、蒸馏速率(35kg/m~2·h、70kg/m~2·h、105kg/m~2·h、140kg/m~2·h和蒸馏方式(水上蒸馏与水中蒸馏)等三因素进行试验。试验结果表明:上述诸因素对出油率均有显著的影响。其中以水上蒸馏效果最显著,不但提高出油率,缩短蒸馏时间、而且桂油质量也较高;原料切碎优于不切碎;蒸馏速率四个水平以70kg/m~2·h为最佳。

Abstract:对窄叶青8号(矮生性基因来自花龙水田谷)、矮种水田谷、辐包矮21号和竹槌等四个籼稻矮源进行了研究。描述了它们在广州晚季自然条件下的表型表现。遗传分析表明:高秆对矮杆除辐包矮21号表现为不完全显性外,其余三个矮源均表现为完全显性。窄叶青8号和竹槌的矮生性均由一个隐性主效基因控制,同时携带一组具有正向效应和负向效应的修饰基因。矮种水田谷和辐包矮21号的矮生性则俱由微效基因控制。按超亲率大小,修饰基因效应强度的大小顺序为:竹槌>矮种水田谷>窄叶青8号>辐包矮21号。矮生性基因的等位关系分析指出:竹槌同矮仔占是互为等位的,窄叶青8号同矮仔占是互不等位的,从而推断竹槌同窄叶青8号也是互不等位的。根据矮生性基因的遗传方式和等位关系,把我国现有的8个主要籼稻矮源归纳为两类四群。此外,还就诱发突变和自发突变矮源的共性以及寻找或创造新的非等位矮源的意义进行了讨论。