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以两个典型的籼粳交重组自交系F6群体(RILSA:中优早8号/丰锦;RILSB:七山占/秋光)为试材,分别在四川和辽宁种植,研究穗型指数(PTI)与亚种特性及产量性状的关系。结果表明,PTI在籼粳交后代中表现连续变异,籼粳交可以创造大量具不同PTI的株系,可以作为理想穗型选育的来源。生态环境对PTI有显著影响,从辽宁到四川,PTI显著变小。PTI与大多数亚种特征性状呈显著负相关。PTI在不同亚种类型间有明显差异,总体上有籼(H)>偏籼(H′)>偏粳(K′)>粳(K)的趋势,但PTI不可以作为判别亚种类型的依据,因为籼粳交后代中的PTI在不同亚种类型间交错重叠。PTI与穗部性状和产量性状大多呈负相关,两群体中绝大多数株系的PTI为中下部优势型,在产量上具有明显优势。
Two typical indica-japonica crosses inbred lines F6 (RILSA: Zhongyouzao 8 / Fengjin; RILSB: Qishanzhan / QiuGuang) were planted in Sichuan and Liaoning Provinces respectively to study the relationship between panicle index PTI) with subspecies characteristics and yield traits. The results showed that PTI showed continuous variation in the progenies of indica and japonica cross, and indica-japonica cross could create a large number of lines with different PTI, which could be used as the source of ideal panicle breeding. The ecological environment has a significant impact on PTI, from Liaoning to Sichuan, PTI significantly smaller. There was a significant negative correlation between PTI and most of the subspecies traits. There was a significant difference in PTI between different subspecies types. Generally, there was a trend of indica (H)> indica (H ’)> japonica (K’)> Japonica (K), but PTI could not be used as discriminant subspecies Based on the PTI in the offspring of indica and japonica crosses between different subspecies types. PTI was mostly negatively correlated with panicle traits and yield traits. PTIs of most of the two groups were dominant in the middle and lower reaches and had obvious advantages in yield.