籼型三系杂交水稻稻曲病抗性遗传研究

Genetic Research of Three-line Indica Hybrid Rice Resistance to False Smut

用抗稻曲病不育系45A为母本与R998等14个感病恢复系及R288选等16个抗病恢复系配组,在病圃中以自然诱发和辅助人工接种的方法,研究杂交水稻抗稻曲病不育系的胞质效应和恢复系稻曲病抗性遗传。结果表明,抗稻曲病不育系45A无胞质效应,与14个感病恢复系所配组合的杂种F1均表现感病;45A与16个抗病恢复系配组的杂种F1稻曲病抗性遗传表达特征有抗性显性(RRR)、抗性不完全显性(RRMR)和抗性隐性(RRS)3种类型,显性和不完全显性的频率为81.25%。杂种F1稻曲病病穗率、病情指数、平均每穗病粒数和病穗上最高病粒数与恢复系相对应的稻曲病病情指标极显著正相关。筛选出HA188、HA197、HA198等6个抗稻曲病杂交稻恢复系新种质。

In order to explore the male sterile （MS）lines＇ cytoplasmic effects and the restorer lines＇ resistant inheritance of rice false smut,with anti-false smut MS 45A as the female parent, crossed with 14 susceptible restorer lines （R988 etc. ）and 16 resistant restorer lines （R288 selection etc. ） ,the study carried out at a disease nursery with natural induce and auxiliary artificial inoculation. The results showed that no cytoplasmic effects existed in anti- false smut MS 45A,and FI of 45A crossed with 14 susceptible restorer lines exhibited susceptible to rice false smut. When 45A crossed with 16 resistant restorer lines, F~ showed three patterns of resistance inheritance including domi- nant,incompletely dominant and recessive. Dominant and incompletely dominant frequency accounted for 81.25%. There was highly significant positive correlation between F~ disease indicators and corresponding restorer lines indi- cators which included disease spike rate, disease index, average diseased grains per panicle, and highest disease grains. HA188,HA197,and HA198 etc. new germlasm of anti-false smut hybrid rice restorer lines were screened. And hybrid rice breeding for false smut resistance was discussed.