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我国水资源贫乏,能源紧张,旱涝灾害频繁。水稻是耗水、耗能大户,且费工费时,水稻面积扩张已近极限,单产增长已趋于徘徊。到21世纪,随着人口膨胀及生活水平的提高对稻米的需求压力将越发加大,粮源供求形势不容乐观。培育水稻抗旱品种对我国具有重大的战略意义。 “早稻”是适于旱地直播旱管的一种既古老又新兴的稻作,其种植管理方式同小麦相似,全生长期勿须水层管理,全靠自然降雨或在此基础上仅辅以少量灌溉,灌水量也仅是水稻的1/4～1/10。旱稻可育秧在
China’s water resources are poor, energy is scarce, drought and flood disasters are frequent. Rice is water-consuming, energy-hungry, and the time-consuming work, the expansion of rice area is nearing the limit, yield growth has tended to hover. By the 21st century, with the population expansion and the improvement of living standards, the pressure on the demand for rice will increase more and more. The supply and demand of grain sources will not be optimistic. Breeding drought-resistant rice varieties is of great strategic significance to our country. “Early rice” is an old and new type of rice suitable for dryland direct seeding drought. It is managed in the same way as wheat and does not require water management during the whole growing season. It depends on natural rainfall alone or supplemented by A small amount of irrigation, irrigation is only 1/4 ~ 1/10 of rice. Upland rice fertile seedlings in