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Published on December 29, 2005; 10.1104/pp.105.070995

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Received September 6, 2005
Returned for revision November 5, 2005
Accepted November 29, 2005

Double Knockouts of Phospholipase D{zeta}1 and {zeta}2 in Arabidopsis Affect Root Elongation during Phosphate-Limited Growth, But Do Not Affect Root Hair Patterning

Maoyin Li , Chunbo Qin , Ruth Welti , and Xuemin Wang *

Department of Biochemistry, Kansas State University, Manhattan, KS, 66506; Department of Biology, University of Missouri, St. Louis, MO 63121 and Danforth Plant Science Center, St. Louis, MO 63132
Department of Biochemistry, Kansas State University, Manhattan, KS, 66506
Division of Biology, Kansas State University, Manhattan, KS, 66506

* Corresponding author; email: wangxue{at}umsl.edu.

Root elongation and root hair formation are important in nutrient absorption. We found that two Arabidopsis phospholipase Ds (PLD), PLD{zeta}1 and {zeta}2, were involved in root elongation during phosphate limitation. PLD{zeta}1 and {zeta}2 are structurally different from the majority of plant PLDs by having phox homology (PX) and pleckstrin homology (PH) domains. Both PLD{zeta}s were expressed more in roots than in other tissues. It was reported previously that inducible-suppression or inducible overexpression of PLD{zeta}1 affected root hair patterning. However, gene knockouts of PLD{zeta}1, PLD{zeta}2, or the double knockout of PLD{zeta}1 and {zeta}2 showed no effect on root hair formation. The expression of PLD{zeta}s increased in response to phosphate limitation. The elongation of primary roots in PLD{zeta}1 and PLD{zeta}2 double knockout mutants was slower than that of wild type and single knockout mutants. The loss of PLD{zeta}2, but not PLD{zeta}1, led to a decreased accumulation of phosphatidic acid in root under phosphate limited conditions. These results indicate that PLD{zeta}1 and {zeta}2 play a role in regulating root development in response to nutrient limitation.




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