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滇农Ｓ－２是以云南地方品种毫干与优良的籼稻品种Ｖ２０杂交，再用黎明复交，按系统选育程序育成的新质源温敏核不育系。该不育系具有在较低温度下雄性败育而较高温下雄性恢复可育的特点。在昆明，不会出现可育性的转变，不育期长达９０天以上，育性稳定，对光照长度不敏感，容易找到可靠的繁殖与制种地点。在一定的条件下其育性受一对或二对隐性核基因控制，容易育成新的温敏两系杂交水稻强优势组合。
Diannong S-2 is a new source of thermo-sensitive genic male-sterile lines that is made from the hybrids of Yunnan local cultivars Diangan with V20, an excellent indica variety, and then re-dawn hybridization. The male sterile line has the characteristics of male abortion at lower temperature and male fertility at higher temperature. In Kunming, there will be no change in fertility. The period of infertility is over 90 days, fertility is stable, insensitive to the length of light, and it is easy to find a reliable breeding and planting site. Under certain conditions, its fertility is controlled by one pair or two pairs of recessive nuclear genes and is easy to fertilize the new strong combination of temperature-sensitive two-line hybrid rice.