这些年的变异并非自然发生,而是常常通过将种子暴露于辐射下等方式引导发生的。阿部知子和她的同事就在进行这一工作以培育大米。他们的工作地点位于东京外部的埼玉县仁科加速器研究中心。不同之处在于他们没有像其他国家一样,利用纤弱的X射线和伽马射线来引发变异。他们将种子放入粒子加速器,并用重离子对种子进行轰击碰撞。重离子是大原子去掉电子后只剩原子核的状态。这一方法比辐射法的效果好十到一百倍,并且有用的种子不易被忽略掉。
Dr Abe s plan is to use these mutations to create salt-tolerant rice. She has tried to do thatseveral times in the past, but the result did not taste very nice. Her latest effort wasstimulated by the flooding with seawater of almost 24,000 hectares of farmland by thetsunami which followed an earthquake in March last year. Salt-tolerant rice would, though,be of much wider use than just restoring the paddies of Miyagi prefecture and its neighbours,the worst-affected part of the country, to full productivity. About a third of the world s ricepaddies have salt problems, and yields in such briny fields may be half what they would be ifthe water in them were fresh.
阿部知子博士计划利用变异制造出耐盐的大米。她已经尝试了多次,但结果不尽如人意。最近的一次尝试是由于去年三月地震引起的海啸冲过了近两万四千公顷农田。耐盐大米的作用不仅仅是还原日本受伤害最大的宫城县内和附近的稻田。全球三分之一的稻田都受到盐的影响,此类稻田的收成仅为正常稻田的一半。
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