宿生棉的利用现状与研究进展

介绍了宿生棉的概念、分类和各自特点,宿生棉在棉花生产、种质资源的保存与创新、杂交制种等方面的利用现状以及宿生棉的再生特性、栽培技术、生理生化特性、耐冷相关性状遗传等方面的研究进展,讨论了存在的问题和解决措施,提出了需要进一步解决的问题,并对宿生棉的发展前景进行展望。     

国际市场特禽动态

1.鹧鸪香港市场每年需求量在5000万只左右.目前,每只鹧鸪价(活重0.5kg以上)30～45港元,另外,韩国、俄罗斯、日本需求量也超过1000万只.2.山鸡在国际市场上享誉很高,每只出口价15美元.3.乌鸡中国乌鸡在国际市场原为观赏用,食用量不多,现已进入食品市场,尤其在日本市场场格外走俏,每只乌鸡已达8000日元.4.贵妃鸡在香港、日本、西欧、东南亚等国际市场颇为畅销,仅香港、澳门年消费量便达150万只,当前货紧价扬,每只市价高达100多港元.5.野鸭在美国、日本、西欧市场需求量极大,销售价每只为10美元.6.其它珍珠鸡、火鸡、孔雀、鹌鹑在国际市场也有相当的销售量,我国的出口量极少.据<畜禽业>2000.2     

Cadmium Accumulation and Its Toxicity in Brittle Culm 1(bc1),a Fragile Rice Mutant

Cadmium (Cd) accumulation and toxicity in rice plants were characterized and identified by using brittle culm 1 (bc1), a fragile rice mutant and its wild type (Shuangkezao, an indica rice) as materials by hydroponics. The low Cd level didn't obviously affect the growth parameters in both rice genotypes, but under high Cd levels (1.0 and 5.0 μmol/L), the growth of both rice plants were substantially inhibited. Moreover, bc1 tended to suffer more seriously from Cd toxicity than Shuangkezao. Cd accumulation in both rice plants increased with the increase of Cd levels. There was a significant difference in Cd accumulation between the two rice genotypes with constantly higher Cd concentration in bc1, which also accumulated more Cd at 0, 0.1, and 1.0 μmol/L Cd levels. The same case was found in the two rice plants grown on Cd-contaminated soil. This suggested that cell wall might play an important role in Cd accumulation in rice plants by the physiological mechanisms. The malondialdehyde (MDA) content, superoxide dismutase (SOD) and peroxidase (POD) activities in rice plants were affected differently under Cd treatments, and which implied that POD might play the main role in detoxifying active oxygen free radical. A significant difference in antioxidative system between the two rice genotypes was found with constantly higher MDA content, SOD and POD activities in bc1. In summary, bc1 accumulated more Cd and appeared to be more sensitive to Cd stress compared with its wild type.     

粮食及饲料粮发展现状与展望

一、我国粮食及饲料粮发展情况种植结构变化较大 ,单产提高 ,总产增加。1 990年以来 ,我国农作物播种面积呈现波动增长趋势 ,1 995年以后保持持续增长。 1 999年我国农作物总播种面积达到 1 56373千公顷 ,比 1 995年增长 4 3 % ,比 1 990年增长 5 4%。农作物种植结构也发生改变 ,粮食、棉花所占比重趋于下降 ,油料、蔬菜、水果等所占比重趋于增长 ,见表 1。表 1　种植结构变化情况 %年份粮食棉花油料糖料蔬菜1990 76.53 .87.3 1.14 .3199573 .4 3 .68.7 1.2 7.1199873 .12 .98.3 1.3 7.91999 72 .4 2 .4 8.91.18.5　　在粮食种植中 ,小麦播…     

杏鲍菇菌渣栽培双孢蘑菇的综合评价

以杏鲍菇的菌渣栽培双孢蘑菇,分析菌渣对双孢蘑菇产量、子实体农艺性状以及成本利润等的影响。试验结果表明:杏鲍菇菌渣与牛粪比例3∶1时双孢蘑菇产量和菇质最好,比稻草栽培和纯菌渣栽培分别提高5.23%和13.36%,且菇体紧实致密,单朵菇平均重35.7 g;纯收入最高的为纯杏鲍菇菌渣,达到42.91元/m2,比对照增加39.82%,经济效益明显。     

杧果扦插育苗试验

１９９２年５月播种海南土杧，１０月１９～２１日在沙床对实用苗进行不同药剂、浓度、处理方法、插条处理对扦插生根的影响试验，共设１２个处理。１９９３年６月１７－１８日继续进行扦插试验，７月２４日将扦插生根苗移于营养袋中培养，９月１８日移于苗地，１９９４年３月进行嫁接，品种为金穗忙，接后常规管理，与种子砧木嫁接苗作比较，调查植株生长、产量情况。试验结果表明： １）ＡＢＴｆ１号生根粉对插条生根的影响低浓度处理应适当延长时间。用１００ ｍｐ．ｌ－１ＡＢＴ１号生根粉分别浸泡插条２、４、１６ ｈ，随浸泡时间的增…     

373F;F083_73侯琼;9-14抽搐吕清明;0当代人The Contemporar

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