Effects of nitrogen,phosphorus and potassium fertilizer treatments on weight loss and changes in chemical composition of potato tubers stored at 4°C

Summary Pot and field experiments were carried out to test fertilizer treatments on the behaviour of potato tubers stores at 4°C and ≥90% relative humidity for 6 months. Weight losses (separated into water and dry matter) were enhanced after N and K fertilization and decreased by increasing P supply. Glucose and fructose contents were reduced at harvest by high N-fertilizer rates compared to no or low fertilization, but throughout storage reducing sugar accumulation was increased, sucrose reduction was decreased and ascorbic acid was increased. K fertilization affected the chemical composition of the tubers somewhat similar to that of nitrogen fertilization. High initial nitrate content of the tubers seemed to be increased and low nitrate values were decreased during storage. The tubers from pot experiments showed similar changes but of greater magnitude.     

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罗马尼亚不同沙棘品种叶中甘树脂的提取

沙棘（Hippophae rhamnoides）是一种可广泛生长于欧亚地区,包括罗马尼亚的小果实灌木。沙棘具有药用及营养价值,同时可以改善区域的微气候环境。人们已经研究了罗马尼亚沙棘的生物化学组分及相关数据,所以我们分析了不同沙棘叶的甘树脂,一个重要的生化参数可以为植株的一项基本新陈代谢——光合作用提供信息。结果表明根据品种及特定环境因素的不同,产生了多样性。     

Peroxidase activity as a possible test for distinguishing s-plasm from n-plasm in sugar beet (Beta vulgaris L.)

Summary The O-type lines (N-plasm) of sugar beet (Beta vulgaris L.) proved to have a consistently lower peroxidase activity (49.2–62.7%) than their male sterile (MS) equivalents (S-plasm).Similar differences in peroxidase activity (45.4–56.3%) were found when O-type lines were compared with unrelated MS lines. They were also observed in different parts of the plant (cotyledons, hypocotyl + radicle, true leaves) and were reproducible.The fertile lines could be grouped by their level of peroxidase activity in categories of either S-plasm or N-plasm.The peroxidase activity test could be used for selection of N-plasm lines from fertile sugar beet populations and for selection of MS and O-type lines of higher stability.     

Peroxidase activity; a potential criterion in breeding for field resistance toPhytophthora infestans

Summary The results of other experiments (cited in the references) showed that peroxidase activity (PA) in clones (cultivars or hybrids) was correlated with field resistance to late blight in uninoculated plants. In contrast, in our experiments where PA was tested in seedlings before inoculation and 5 and 15 days after it, the correlation was found only with PA data recorded after infection. Negative and positive correlations with PA were found, respectively, when the population structure was expressed in four size classes (before inoculation) or of attack intensity (after inoculation).     

History, Statistics and Trends of the Romanian Potato Industry

This paper provides some important data on the evolution of the potato crop in Romania including aspects of research and development, differentiated on the basis of period and location. The paper also presents an analysis of the causes of the low potato yield per hectare in Romania. An analysis of the situation of the potato industry in Romania in comparison with the potato sectors of other Central and East European countries, over the period 1996–2006, reveals that—after Poland—Romania occupies the second place in terms of potato acreage and total production. Present and future objectives are described to solve the current problems of the potato crop in Romania under the prevailing economic and climatic conditions.