发根力作为栽培稻品种苗期抗旱性鉴定指标的研究

Studies on Using Rooting Capacity to Appraise the Drought Resistance of Different Varieties of Oryza sativa at Seedling Stage

栽培稻抗旱育种过程中,对不同材料苗期进行抗旱性鉴定可对众多的种质资源或育种过程中大量的早代材料进行抗旱性的初步、简单快速鉴定,从而可以提高选择效率,加快抗旱育种进程。因此,鉴定指标的选择尤为关键。本研究表明,在25%(w/v)PEG条件下,新根总长、新根数、新根干重等3个发根力指标的降幅与不同栽培稻品种苗期的抗旱性均呈极显著负相关,且该指标测定简便、快速准确,可用于大量材料苗期的抗旱性鉴定。

Simple and rapid evaluation on drought-resistance of various varieties of rice can increase the selective efficiency and further quicken breeding program. To select an agronomic index is a key to appraise resistance. In this paper, the significant correlations between the range of reduction in rooting ability indexes, i.e. total root length, root number and root dry weight, and drought resistance at early stage of rice were observed in PEG treatment （25%）. Additionally, measuring rooting capacity is characteristic of simplition and rapidity. So, the results suggest that rooting capacity may be used for evaluation on drought resistance of rice at early stage.