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怀Vs是用V20A转育而成的早熟早舢型低温敏两用核不育系。它既保持了V20A配合力好的优点，又克服了V20A受恢保关系制约的弱点，特别是具有生育期短，有利于测配出早、中熟早稻组合的特点。一个新不育系的育成，其配合力如何，是决定实用价值的一个极其重要的特性指标。几年来，
Pregnant Vs V20A is a precocious podcasting thermo-sensitive dual-purpose genic male sterile line. It not only maintains the advantages of good combining ability of V20A, but also overcomes the weakness of V20A restricted by the relationship of restoring guarantee and guaranteeing, especially it has the characteristics of short growing period and favorable combination of early maturity and medium maturity early rice combination. The formation of a new sterile line, its combining ability, is to determine the practical value of an extremely important characteristic index. In recent years,