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Why two-l<strong>in</strong>e breed<strong>in</strong>g?<br />
• An alternative to three-l<strong>in</strong>e system—to exploit hybrid<br />
vigour (Yuan, 1998).<br />
• Risk <strong>in</strong> excessive dependence on s<strong>in</strong>gle source of<br />
CMS WA based.<br />
• Seed Production most difficult and laborious.<br />
• Parental l<strong>in</strong>e development/improvement-most<br />
cumbersome.<br />
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