海棠(Malus spp.)品种分类研究进展

海棠是重要的温带观赏花木,在我国和世界园林中广泛应用．对海棠的研究历史包括其植物学分类与园艺学分类、栽培历史和起源演化,形态学分类与实验分类研究以及国际登录等方面的研究现状进行综述,认为海棠的品种分类工作还很不完善,仍需进一步研究,并总结了海棠品种分类研究存在的主要问题及今后的研究方向．     

水稻品种以及施肥措施对稻田甲烷排放的影响

１９９４年４月至１０月，在北京稻田试验田研究了不同水稻品种对甲烷排放的影响以及施肥措施对降低甲烷排放和提高水稻产量的匹配关系。实验表明稻田甲烷排放在品种之间存在着明显差异，实验中品种间甲烷排放通量最大差异可达到五倍。以有机肥混合硫酸铵作底肥并配合不同时间和不同用量的硫酸铵作追肥与仅施混合底肥不施施硫酸铵作追肥的相比较可减少甲烷排放约５８％，水稻产量提高３１．７％。可明显地抑制水稻生长期的甲烷排放高     

The effect of various potato cultivars at different times during growth on starch content determined by DSC

Differential scanning calorimetry (DSC) was used to determine the starch content of potato dry matter isolated from various cultivars at different times during growth. When potato dry matter was heated in the presence of excess water, a symmetrical endothermic peak resulted, which was similar to the gelatinization peak of pure starch. From the enthalpy value of potato dry matter and pure potato starch at a moisture content of 70%, the starch content in the potato dry matter can be determined. Starch content increased as growth progressed to a maximum and then decreased. The effect of moisture content and sample mass on gelatinization of dry matter and starch was also investigated. Compared to other starch analysis technique, DSC is a simple and more rapid method.     

Organic acid, tocopherol, and phenolic compositions of some Turkish grape cultivars

The organic acid, tocopherol, and phenolic compositions of three different grape cultivars, Emir, Kalecik karasi, and Narince were studied in order to evaluate their nutritive values and the contents of natural antioxidants. Organic acids, tocopherols, phenolic acids, flavonoids, and trans-resveratrol contents were analyzed by high-performance liquid chromatography (HPLC). In addition, pH, soluble solid, titratable acidity, and total phenolic contents were also determined. It was determined that the contents of organic acids, tocopherols, and phenolic compounds were changed according to the cultivars. Published in Khimiya Prirodnykh Soedinenii, No. 2, pp. 128–130, March–April, 2006.     

运用AHP法综合评价河南部分桂花品种

运用层次分析法对河南省的17个桂花品种进行了生产加工利用和园林观赏应用方面的综合评价．就花色、花香、花期等12个因子对该17个品种其进行综合考察，按评分标准计算出每一品种的综合分值，将它们划分为四个等级．总体评价表明，四季桂的品种得分相对较低，金桂品种群和丹桂品种群的大部分桂花品种在生产加工利用和园林观赏方面有着较高的利用价值，得分也较高．     

定西市主要栽培马铃薯品种的农艺性状和营养价值分析

以定西市广为种植的7个马铃薯品种为材料,对其农艺性状和营养价值进行了测试分析.结果表明在测定分析的8个农艺性状中,不同品种的马铃薯在块茎形状、皮色、肉色,熟性和生育日数等方面存在着较大的差异,但在芽眼深浅和芽眼多少等方面的差异较小;在测定分析的5个营养成分中,不同的品种所含营养成分的比重各不相同,依其所含营养成分的不同,可将不同品种的马铃薯分为菜用型、淀粉加工型、薯条炸片加工型等不同的用途.     

超晚播节水栽培冬小麦品种花后光合与灌浆特性

 为探寻黑龙港地区超晚播节水栽培条件下冬小麦的适宜品种,采用大穗型（潍麦8号）、小穗型（衡水4399）和中间穗型（济麦22）3种不同类型品种连续3年进行大田试验,研究了不同穗型品种的花后光合特性和籽粒灌浆特征。结果表明,在超晚播栽培下,不同品种产量的差异主要是千粒重的差异;3个品种中济麦22千粒重和产量均最高,主要是由于灌浆持续期特别是活跃灌浆期较长、灌浆后期的灌浆速率较高所致。与潍麦8号和衡水4399比较,济麦22在灌浆后期不仅具有较高的光截获率,还具有较高的叶片光合活性,这是其灌浆期较长、后期灌浆速率较高的主要原因。因此,中间穗型品种济麦22是黑龙港地区超晚播节水高产栽培的适宜品种。     

几个槐树植物的ISSR鉴定

运用ISSR分析技术，对香花槐、龙爪槐、刺槐和红花槐4份材料进行品种鉴定和聚类分析．用筛选出的19个引物扩增得到了4个槐树植物的DNA指纹图谱，结果表明各槐树之间的相似性系数在0．18～0．91之间，龙爪槐和红花槐间的相似性系数为0．18，香花槐和红花槐间的相似性系数为0．91，香花槐、龙爪槐、刺槐和红花槐在DNA分子水平上的差异较明显，据此我们初步认为香花槐和红花槐不存在同物异名现象．     

Genetic diversity of rice cultivars （Oryza sativa L.） in China and the temporal trends in recent fifty years

Public concern is often expressed at cultivars because the domestication and modern plant breeding have led to a reduction in the genetic diversity of crops and loss of genes, which could result in crops' genetic vulnerability to changes in the spectrum of pestssity of varieties in this zone is very important to the whole rice production in China. REZV, a important japonica rice production areas with more than 278 thousands ha rice which was about 71% of rice area in north China, accounted fo…     

6个茶树品种的红茶适制性研究

为了研究福选9号等6个茶树品种的红茶适制性,为实际生产提供一定的依据,对其所制工夫红茶进行感官评价和品质成分分析.结果表明,福选9号、梅占、福鼎大白茶和名山131品质较好,其中以名山131汤色最好,福选9号香气最佳,梅占滋味最优;品种间品质成分存在不同程度的差异,以茶黄素、茶多酚和茶红素的差异较大.