微甘菊生活史及其对除莠剂的反应研究

微甘菊种子细小．千粒重０．０８９２ｇ，在自然条件下６～８天内完全萌发，萌发率９５．３％。种子萌发最适温度２５～３０℃，４０℃可使种子完全丧失萌发能力，５℃则明显抑制种子萌发。无性繁殖的营养生长比实生苗生长更快，光照对种子萌发和营养生长都有明显的促进作用。有性繁殖期是在９月至翌年２月，这时花的生物量占植株地上部分总生物量的３８．７％～４２．８％。小花从现蕾、盛开到受精形成成熟种子仅１５～１７天，但每天需光照１２ｈ左右才能正常结实。除莠剂“兰达”（Ｒｏｕｎｄｕｐ）、“草坝王”（Ｂｅｎｔａｚｏｎ）、“毒莠定”（ＴＯＲＤＯＮ）和“恶草灵”（ＲＯＮＳＴＡＲ）都对微甘菊种子和幼苗有杀灭作用，其中以浓度为０．４％的“草坝王”和０．２％的“毒莠定”效果较佳。     

Resequencing of 31 wild and cultivated soybean genomes identifies patterns of genetic diversity and selection

We report a large-scale analysis of the patterns of genome-wide genetic variation in soybeans. We re-sequenced a total of 17 wild and 14 cultivated soybean genomes to an average of approximately ×5 depth and >90% coverage using the Illumina Genome Analyzer II platform. We compared the patterns of genetic variation between wild and cultivated soybeans and identified higher allelic diversity in wild soybeans. We identified a high level of linkage disequilibrium in the soybean genome, suggesting that marker-assisted breeding of soybean will be less challenging than map-based cloning. We report linkage disequilibrium block location and distribution, and we identified a set of 205,614 tag SNPs that may be useful for QTL mapping and association studies. The data here provide a valuable resource for the analysis of wild soybeans and to facilitate future breeding and quantitative trait analysis.     

Clothing Colour Preferences in A Hospital Environment in Hong Kong:Part Ⅱ-Paediatric Nurses’Preferences of Colour on Their Uniform

The present study investigated nurses'colour prefer-ences on their uniform in paediatric wards.Results ofthe study provided guidelines for the selecting of ap-propriate colours for nurses'uniforms for paediatricwards,and the comparison of nurses'preferences ofcolours on their uniform and child patients'colourpreferences of nurses'uniform was drawn.