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利用240份源于珍汕97B/明恢63的重组自交系水稻(Oryza sativa L.)群体,连续2年调查纹枯病病级与水稻生育期、株高和叶片长宽等18个株形性状的关系。对株形性状与纹枯病病级进行了偏相关分析。实验结果,只有植株松紧度与病级表型偏相关两年中都达到了显著或极显著水平,倒2叶基角、穗层整齐度等8个性状与病级之间的偏相关只有一年达显著或极显著水平。结合构建的分子标记遗传连锁图谱,对各性状进行QTL定位。在抗纹枯病QTL相近区间仅检测到控制分蘖角、植株松紧度和倒2叶基角的QTLs,未发现其余株形性状QTLs与抗纹枯病QTLs分布在同一染色体上。结果表明,水稻对纹枯病的抗性主要是由本身抗性基因控制,株形对纹枯病抗性表达的影响主要是间接影响,即通过改变田间小气候而影响发病程度。抗纹枯病育种在累加主效抗纹枯病QTLs的同时,也要注重选择不利于纹枯病发展的株形性状。
A total of 240 Oryza sativa L. population derived from Zhenshan 97B / Minghui 63 were used to investigate the relationship between sheath blight disease stage and rice growth period, plant height and leaf length and width The relationship between the traits. Partial correlation analysis was made between plant-shape traits and sheath blight disease grade. The experimental results showed that there was only one significant correlation between disease severity and 8 traits, such as inverted 2-leaf base angle and panicle uniformity Year reached significant or very significant level. Combined with the constructed molecular marker genetic linkage map, QTLs were mapped to all traits. Only QTLs controlling tillering angle, plant tightness and 2-leaf base angle were detected in the QTLs for resistance to sheath blight. No other QTLs were found on the same chromosomes with resistance to sheath blight. The results showed that the resistance of rice to sheath blight was mainly controlled by self-resistance genes. The impact of plant shape on the resistance to sheath blight was mainly indirect, that is, the change of microclimate in the field affected the disease severity. Resistance to sheath blight breeding in the accumulation of main effects of sheath blight QTLs, but also pay attention to choose not conducive to sheath blight development of plant-shaped traits.