为解决甘薯生产受品种、病虫害、干旱等限制的问题，研究人员开展了甘薯基因型遗传多样性和营养成分的研究。结果发现甘薯种质存在变异，部分性状相关性显著。该研究为甘薯育种和品质改良提供了依据。

YAOUNDE, April 24 (Xinhua) -- Cameroon on Thursday began vaccinating children against polio as part of a synchronized regional vaccination campaign to protect 83 million children in the Lake Chad ...