Although the described systems have provided important information about anther and pollen development, and ways to interfere with it, their potential use for commercial hybrid seed production is often limited because of the lack of
Normal anther development male fertile plant
Fig. 14.3 Engineering male sterility with b-ketothiolase. (a) In chloroplasts, acetyl-CoA is normally converted by acetyl-CoA carboxylase to yield malonyl-CoA. (b) In transgenic plants expressing high amounts of b-ketothiolase, this enzyme out-competes acetyl-CoA carboxylase converting acetyl-CoA into acetoactyl-CoA. As a consequence, anther development is impaired. Based on data from Ruiz and Daniell (2005)
cost-effective and efficient methods to multiply the engineered male-sterile plants (for an overview of multiplication strategies, see Perez-Prat and van Lookeren Campagne 2002).
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