,Short-Root1 Plays a Role in the Development of Vascular Tissue and Kranz Anatomy in Maize Leaves

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Dear Editor,Understanding how Kranz anatomy develops in C4 plants is a critical part of the current worldwide effort to transfer C4 photosynthesis into C3 plants,including rice.Recently,it was proposed that the Kranz architecture that supports C4 photosynthesis in maize leaves is an extension of the endodermal program,which is active in roots,stems,and petioles,and is ubiquitous in angiosperms (Slewinski et al.,2012;Slewinski,2013).Support for this hypothesis was shown in maize in which mutations in the Scarecrow (SCR) gene,a primary regulator of endodermal formation,resulted in the development of ectopic bundle sheath cells (BS),merged veins without intervening mesophyll (M) cells,starch-less BS cells,and loss of minor veins (V) (Slewinski et al.,2012).
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