黄皮种子在萌发过程中脱水敏感性变化的研究

在萌发过程中，黄皮完整种子的干、鲜重变化，干燥处理时的脱水速度和脱水敏感性变化都与其离体胚轴明显不同，子叶树于延缓胚轴耐水性的丧失可能起重要作用，胚根突破种皮的时期不是其耐脱水性丧失的时期，而与正常性种子在萌发过程中的耐脱水性变化模式相区别。     

The measurements of acid detergent fibre in rapeseed by visible and near-infrared spectroscopy

Visible and near‐infrared spectroscopy (NIRS) calibrations for acid detergent fibre (ADF) in intact rapeseed (Brassica napus L.) were performed for two different sample volumes (10 ml, 500 seeds approximately; and 1 ml, 50 seeds approximately). The inclusion of brown and yellow‐seeded cultivars in this work has allowed the whole range of ADF currently described in the literature for this character to be covered. Chemometric techniques have been used for developing calibration equations for both procedures when measuring the two different seed sample volumes. On the basis of the coefficient of determination in the cross‐validation (R²cv) obtained for the 10 and 1 ml assays (0.80 and 0.73), and SECV/SEL ratios (2.30 and 2.57), respectively, both equations showed an accuracy sufficient for screening purposes in an ADF range from 6.80 to 13.46% dry wt, which is presented in this work.     

20℃下3种蔬菜种子长年贮存后生理特性和遗传稳定性的研究

对在低温和常温下贮藏13年的萝卜、番茄和芹菜3种蔬菜超干种子的发芽势、发芽率、苗长、胚根根尖细胞染色体畸变率和随机扩增的多态性DNA(RAPD)等指标进行测定分析，并研究了种子活力、生活力及其遗传稳定性的变化。多年超干贮存后，部分处理染色体异常的百分率有所增加，它与发芽率成反比，但发芽率低的种子在繁殖更新后，异常率会降低，较高的染色体异常率不会遗传下去。     

几个水稻品种的种子蛋白超薄等电聚焦谱带的差异

利用超薄等电聚焦技术对6个水稻品种种子贮藏蛋白进行了分析，发现供试水稻品种间的谱带有差异，据此差异，能有效区别6个水稻品种。     

Variation for reproductive and agronomic traits among T. repens × T. nigrescens third generation backcross hybrids in the field

Interspecific hybridisation with Trifolium nigrescens Viv. is a possible strategy to improve the reproductive potential of white clover (Trifolium repens L.). Following the development of a fertile F1 hybrid, three generations of backcrossing have been carried out usingT. repens as the recurrent parent. Vegetative characteristics, stolon growth and seed yield components of the backcross (BC) 2 and 3 generations, as well as the parental species were measured on spaced plants grown in the field. Leaf size and plant spread of the BC2 and BC3 generations were less than T. repens but there was no difference in plant fresh weight. Numbers of inflorescences per plant and florets per inflorescence of the backcrosses were greater than T. repens however this was not reflected indifferences in seed yield per plant asT. repens had more seeds per floret and per plant than the backcrosses. Differences in stolon length, the proportion of flowering nodes and the pattern of axillary bud development were observed between T. repens and the backcrosses. Significant variation among the BC 3 generation for vegetative and reproductive traits was observed. Individual plants among the BC 3 generation were identified that combine high forage yield, substantial inflorescence production and good fertility, and these will form the basis of further selection. This revised version was published online in August 2006 with corrections to the Cover Date.     

Seed production and breeding potential of the fluted pumpkin,Telfairia occidentalis

Summary Studies during 1980–1987 relating to seed production of the fluted pumpkin (Telfairia occidentalis Hook. f.) are summarized. Essentially, the dioecious nature of the crop makes sex-ratios of plants affect the number of fruit-bearing females. Overall, about 50% of plants are female, of which some 15% are fruitless. Each fruit-bearing female has 1.5 fruits that contain 60 seeds. The mean weight of seeds is 15 g, and 74% of this total seed weight comprise the seed kernel which contains about 40% oil. Thus, a yield estimate of seed kernels reaches 1.9 t/ha; an output that is superior to that of most other oil seeds now being exploited for seed oil and cake in Nigeria. Measures to raise seed yields and the possibility of breeding work are discussed.     

中国种业机械化现状调研与发展分析

种业机械化是种业现代化的重要基础和前提,是涵盖品种选育、品种试验、制种生产、种子加工等多环节的系统工程。为了系统梳理中国种业机械化发展成果与存在问题,有效推进种业机械化发展、促进种业现代化建设,该文从田间试验机械化、制种生产机械化、种子加工机械化等方面阐述了国内种业机械化现状调研情况和国际种业机械化发展经验,分析了中国种业机械化存在的主要问题:种业装备企业普遍规模小、装备差、科研投入少,整体水平与国外存在较大差距,装备功能有待扩展、结构设计有待优化、现代化控制水平有待提高等;提出了种业机械化研究重点:1)主要农作物品种试验机械化关键装备研究;2)主要农作物制种生产机械化关键装备研究;3)主要农作物种子低损高效精细加工技术集成研究。指出了"规模化、标准化、集约化、机械化"种子生产是现代种业持续、健康发展的重要保障和基本发展方向。     

竹粉的稀硫酸预处理及酶解技术研究

采用稀酸对竹粉进行预处理,结果表明竹粉酶解的最佳优化条件为:温度125℃,固液比最佳比值为1:10,硫酸浓度为4%,预处理时间为2 h,经过酶处理以后,其竹粉水解率达57.99%,半纤维素水解达70.18%.     

湖南省杉木种子园结实现状及发展对策

从分析湖南现有杉木初级、1.5代、2代种子园结实量现状入手,分析了不同世代的种子园结实量低的原因.初级种子园主要是林龄大,树体高大,本身结实量少,加上树体大,可采种子非常少;1.5代种子园,都闭度大,树枝枯死,造成结实量少;2代种子园管理粗放,种子产量不高.根据多年对种子园结实量研究,提出了提高种子园结实量的主要技术措...     

湿地松种子园种子高产技术

通过对无性系选择、栽植密度与经营密度管理、专用肥、抚育管理、辅助授粉、病虫害防治等方面的论述,阐明了湿地松种子园种子高产技术.