寒地早粳品种稻瘟病抗性与产量性状的关系

采用寒地早粳近5年审定和参加黑龙江省区域试验、生产试验的水稻品种316个为材料,对稻瘟病抗性与水稻生育特性、产量性状的相关关系进行了研究.结果表明,无论在人工接种还是在自然感病条件下,寒地早粳品种的叶瘟、穗颈瘟与生育日数、活动积温呈极显著负相关,平均相关系数分别达到-0.2647、-0.1796和-0.2090、-0.1743;叶瘟、穗颈瘟与穗长呈极显著负相关,平均相关系数为-0.3027和-0.2765,而与平方米穗数呈显著正相关,平均相关系数达到0.1953和0.1481,穗颈瘟与产量呈显著负相关,相关系数为-0.1792.表明在寒地稻作区生育日数越长、活动积温越高叶瘟和穗颈瘟的发病越轻,平方米穗数越多稻瘟病越重,品种抗病性越强产量越高.因此,通过对品种生育性状的适当选择,在寒地稻作区完全可以选育出既高产又抗病的水稻新品种.

Study on Relationship between Resistance to Blast and Yield Traits in Early Japonica Rice in Cold Region

Correlation coefficients between rice resistance to blast and yield traits of 316 varieties which were tested in the region trial in the cold regions in recent 5 years. The result showed: A significant negative correlation effect between resistance to leaf and neck blast and growth days, active accumulated temperature in cold region early japonica rice varieties. A significant negative correlation effect between resistance to leaf and neck blast and panicle length, the numbers of panicle per m2 was just the opposite; a significant negative correlation effect between resistance to blast and yield. Show that the rice of growth days longer and active accumulated temperature higher leaf blast and panicle blast incidence of the fewer, more panicle per m2 blast heavier, the stronger the resistance of varieties yield higher in cold areas. So the appropriate choice of reproductive traits of rice varieties, can be selected not only high-yield and disease resistance of new varieties of rice in the cold regions.