酸碱对低活力苜蓿种子萌发及初期生长的影响

以H2SO4，HCl，HNO3及NaOH为激活荆，研究其对低活力苜蓿种子萌发及初期生长产生的影响。结果表明：不同酸碱处理及其时间不同，效果差异明显，但各处理在不同程度上均对苜蓿种子萌发和初期生长有促进作用；尤其是短时间HNO3处理，对激发苜蓿种子活力效果最佳。     

不同基质和肥量配比对番茄幼苗及前期产量的影响

分析了不同基质和肥量配比对番茄幼苗和前期产量的影响，结果表明，废棉籽壳能代替泥炭基质作为番茄基质育苗，施用半量的底肥比全生的底肥效果略好。     

Landscape change under indirect effects of human use: the Savanna of Central Chile

The Chilean Intermediate Depression to the north of Santiago has experienced a physiognomical transformation from a Prosopis chilensis woodland to an Acacia caven savanna. Today P. chilensis trees are scarce and belong mostly to the larger size classes. By contrast A. caven seems to reproduce frequently and its populations consist of individuals of all size classes. In this paper we document these changes and report the results of tests aimed at determining the causes of these physiognomical changes. We found that livestock, leporids, introduced Mediterranean forbs and agriculture account for differences in seed dispersal and survival of A. caven and P. chilensis, which can explain the documented changes in the Chilean landscape.     

Photosynthate Unloading from Seed Coats of Phaseolus vulgaris L. an Attempt to Define Conditions Required for Stimulation by Abscisic Acid and Benzylamino Purine

The instablity of the stimulation of photosynthate unloading from seed coats of Phaseolus vulgaris by abscisic acid (ABA ) and benzylamino purine ( BAP ) was studied in terms of experimental conditions. ABA stimulated photosynthate unloading at pH 6 and pH 8 without close dependence upon pH. ABA at a concentration range of 10-5-10-4 mol/L displayed stimulatory effect. However, BAP revealed no effect at a concentration range of 10-6-10-4 mol/L. Experiments designed with different transport time of 14C-photosynthate indicated that ABA might act at the plasma membrane of the unloading cells. Reducing endogenous ABA level by diminishing leaf area did not facilitate the manifestation of exogenous ABA function. Potassium ion stimulated photosynthate unloading from seed coats with highest promotion at 100 mmol/L K . However, no dependence of ABA stimulation of photosynthate unloading on K was found.     

Dynamics of the Cumulation of Macroelements – Phosphorus, Potassium, Calcium and Magnesium During Development to Maturity of Soybean Seed

Dynamics of the cumulation of phosphorus, potassium, calcium and magnesium in developing seed of four soybean genotypes under the defined climatic conditions in the course of three years was observed. Samples were being taken at weekly intervals from the point at which the grain reached a size suitable to be analyzed up to the full maturity of the seed. By analyzing the results it was found out that the intense cumulation of the minerals tested took place during the stages III and IV of the seed development, that is, in the course of intense cumulation of dry matter and the most expressive metabolic activity in the seed. Investigation of the impact of climatic conditions provides evidence that cumulation of the tested macroelements has been favourably influenced by increased precipitation along with moderate air temperatures within the seed developing period. The highest content of the minerals found with the cultivar Maksimirka independently of the year investigated reveals that mineral cumulation in soybean seed is affected by the cultivar and genetic particularity.     

杉木第二代种子园子代测定效果分析

本文对福建省官庄林场杉木第二代种子园自由授粉子代试验林树高、胸径和材积等生长性状进行了研究。子代测定结果表明，参试家系间的效应显著；利用方差分析的结果，估算了杉木树高、胸径和材积的家系遗传力和单株遗传力，并以１０％、２０％的选择强度估算出杉木的遗传增益值。通过分析得出杉木各生长性状间有较高的相关性。依材积选择出４６个优良家系，用作造林，４年生时估计其遗传增益可达４１．３７％～５１．３７％。     

杂交条纹鲈苗种小水泥池培育技术试验

用地上露天小水泥池8个．进行杂交条纹鲈苗种培育试验．放养313龄水花30000尾．通过天然饵料、藻粉投喂以及适当水质管理措施．经32天培育，共培育3．5～4．6cm体长的鱼种4336尾．最高成活率为19．1％，最低为6％，平均为14．5％。     

提高湖南省杂交棉种质量水平的商榷

在市场经济迅速发展、种子生产、流通量不断增加和加入WTO的新形势下，充分提高湖南省棉种的质量水平，推动棉种产业化的健康发展，对农民增收、农村稳定具有重大的现实意义。本文简要介绍了提高湖南棉种质量水平的紧迫性和可行性。在此基础上提出了提高棉种质量水平促进产业化发展的几点建议。     

超临界CO_2流体处理工艺对木材渗透性的影响

以苯—乙醇为夹带剂,研究超临界CO2流体不同处理压力、温度、时间对福建产杉木、马尾松、檫木木材渗透性的影响。结果表明,在35 MPa内,处理压力的增大有利于3种木材渗透性的提高;杉木在处理温度为40℃时,渗透性的变化率达到最大,为493%,马尾松和檫木在处理温度为45℃时,渗透性的变化率达到最大,分别为479%和349%;较佳的处理时间为30 min。     

芝麻的核型与系统演化

对１０份粒色不同的栽培和野生芝麻的染色体组型研究表明，栽培芝麻染色体数目一致，核型基本相同：２ｎ＝２６＝１２ｍ＋１２Ｓｍ＋２Ｓｔ随着粒色的变浅，核型的不对称性加强，有两对随体染色体。野生芝麻核型与栽培芝麻相似：２ｎ＝２６＝１２ｍ＋１２Ｓｍ（４ＳＡＴ）染色体数目有２ｎ＝２６，２ｎ＝３２，２ｎ＝５８或２ｎ＝６４．芝麻可能是由对称核型向不对称核型演化，其趋势为：野生（２ｎ＝２６）－黑粒－褐袜－黄粒－白粒