Asia ' s green revolution centered on wheat and rice . but experts asid no single crop will revolutionize farming in africa . because farmers there grow a mixture of different crops 亚洲绿色革命的重心放在小麦和水稻上。但是专家表示没有一种单一的农作物可以给非洲农业带来根本性的变化，因为那里的农民混合种植不同的农作物。
Based on the analysis of advantages and constraints in existing plant type models and modem breeding programs , a viewpoint of dynamic ideotype was put forward and discussed for shaping its specific morphological structure in the growth cycle of rice 提出了动态理想型的株型观点和水稻动态理想型的主要塑造途径，对水稻动态理想型育种进行了展望。
This research is a part of the liaoning natural science fund - " study on the mechanism of saving water and cost for the rice planting technology of germinated rice seed direct sowing with recycling paper mulching " ( 20022082 ) 本研究是辽宁省自然科学基金“纸膜覆盖水稻种植工艺及其作用机理” ( 20022082 )的一部分。本文在查阅了国内外大量文献资料的基础上，研究了国内外节水技术的研究动态和水稻种植机械化的发展。
2 . in rhizosphere culture experiment , re applications with appropriate dose in three weeks significantly increased the biomass ( dry matter ) of rape and rice , and the effects of re on the rape was better than the rice , but they decreased or became little significant in eight weeks 根际培养条件下，第三周低浓度稀土处理显著提高油菜和水稻的生物量(以干物重计) ，对油菜的作用效果优于水稻，第八周作用趋缓或不明显。
Dreb - type transcription factors can accept stress signals from environment and promote the expression of stress - tolerant genes . four dreb homolog genes , gmdreba , gmdrebb , gmdrebc and osdreb4 - 2 were isolated from soybean [ glycine max ( l . ) merr . ] Dreb类转录因子能接受逆境信号并启动逆境应答基因的表达。在本研究中，以大豆和水稻为材料，共克隆了4个dreb的同源基因，分别命名为gmdreba ， gmdrebb ， gmdrebc和osdreb4 - 2 。
3 . wether at the third or eighth week , n , p , kand ca absorptions in rape and rice with re treatments of appropriate dose increased , the effects at the third week were better than at the eighth week , and the absorptions decreased significantly with higher re treatments 无论是在第三周或第八周，低浓度稀土处理均促进了油菜和水稻对氮、磷、钾和钙的吸收，且短期内作用效果更明显，同时高浓度稀土处理均显著地抑制两种作物对氮、磷、钾和钙的吸收。
Fe , mn , cu and zn contents in the roots of rape and rice changed differently , they all decreased in the roots of rape except cu and increased in the roots of rice except zn at the third week compared with control . 4 . re applications enhanced ree absorptions in the roots of rape and rice 稀土处理对油菜和水稻根系内微量元素fe 、 mn 、 cu和zn含量存在不同的影响，对油菜主要表现降低作用，仅提高铜的含量，对水稻则主要以增加为主，只有前期对锌含量有降低作用。
Water use efficiency in shunyi is comparatively 12 - 50 % lower than national level at present for crops except rice and soybean , which means a great water - saving potential in the region according to comparison between experimental observation and estimation . for most crops , yield potential can hardly be increased . therefore , it is necessary to enhance water - saving efficiency of cropping in the region 2 )比较当前顺义区作物实际水分利用效率和全国平均的作物水分利用效率得出：除夏大豆和水稻外，顺义区其它作物水分利用效率低于全国平均值12 ? 50 ，与当地试验值和理论计算值相比，还有很大的增长潜力；而作物实际产量与理论产量的比较表明，大部分作物的增产潜力已不大，所以，种植业节水效率还有待于进一步提高。
We obtained our transgenic material , the rice suspension cells , by inducing embryonic rice callus . then we constructed the expression vector pca - ced9 , and transferred ced - 9 gene into the rice callus and embryogenic suspension cells . the work of using hygromycin selective medium to obtain regenerated plants is still going 构建了用于水稻中表达的载体pca - ced9 ，通过农杆菌eha105转化导入水稻愈伤组织和水稻悬浮细胞，经潮霉素( hym )筛选，以期望获得抗性植株，目前该工作仍在进行中。
The fourth part offers the adaptability of the cultivation of different spicies of rice , and some examples to reveal knowledge discovery in detecting the most suitable seed sowing period , which leads to the resolution that makdsrcd having achieve a special function to discover knowledge in rice cultivation database , makdsrcd is a new way to achieve the knowledge of rice cultivation and is valuable to some degree 第四章绐出了水稻栽培品种的适宜性和水稻最佳播种期的知识发现实例，实践表明makdsrcd具有水稻栽培数据库发现知识的独特功能，是获取水稻栽培知识的一种新途径。
