Abstract
The degree of male sterility of pol A-lines, measured by a male sterility index (MSI) had significant linear relationships with both seed yield and hybridity of hybrid summer rape seed lots. Seed yield increased by 352 kg ha−1, while hybridity decreased by 6% per unit increase in MSI. A hybridity of 100% required an MSI of very nearly zero.Key words: pol CMS, Brassica napus, hybrids, MSI
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