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30年前的“绿色革命”,采用精心设计的杂交育种,曾培育出“奇迹稻”、“超级小麦”,为缓解发展中国家的粮食危机,作出过重大贡献。玉米也是拉美、非洲许多国家种植的主要粮食作物,但是热带地区的过酸土壤和干旱,却使玉米的产量无法保证。例如,1933年干旱袭击非洲和美洲,世界玉米产量减产15％,仅非洲就少收了2000余万吨。因而,培育耐酸性土、抗旱的玉米,一直是农学家追求的目标。
The “green revolution” 30 years ago, with well-designed crossbreeding, has nurtured “miracle rice” and “super wheat” to make a significant contribution to alleviating the food crisis in developing countries. Corn is also the staple food crop grown in many countries in Latin America and Africa, but over-acid soils and droughts in the tropics can not guarantee the yield of corn. For example, in the drought hit Africa and the Americas in 1933, the world’s maize production was cut by 15% and Africa alone received a little over 20 million tons. Therefore, cultivating acid-resistant soils and drought-resistant maize has always been the goal pursued by agronomists.