title: Double knockouts of phospholipases Dzeta1 and Dzeta2 in Arabidopsis affect root elongation during phosphate-limited growth but do not affect root hair patterning.
abstract: Root elongation and root hair formation are important in nutrient absorption. We found that two Arabidopsis (Arabidopsis thaliana) phospholipase Ds (PLDs), PLDzeta1 and PLDzeta2, were involved in root elongation during phosphate limitation. PLDzeta1 and PLDzeta2 are structurally different from the majority of plant PLDs by having phox and pleckstrin homology domains. Both PLDzetas were expressed more in roots than in other tissues. It was reported previously that inducible suppression or inducible overexpression of PLDzeta1 affected root hair patterning. However, gene knockouts of PLDzeta1, PLDzeta2, or the double knockout of PLDzeta1 and PLDzeta2 showed no effect on root hair formation. The expression of PLDzetas increased in response to phosphate limitation. The elongation of primary roots in PLDzeta1 and PLDzeta2 double knockout mutants was slower than that of wild type and single knockout mutants. The loss of PLDzeta2, but not PLDzeta1, led to a decreased accumulation of phosphatidic acid in roots under phosphate-limited conditions. These results indicate that PLDzeta1 and PLDzeta2 play a role in regulating root development in response to nutrient limitation.
authors.affiliation: Department of Biochemistry, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Maoyin
authors.initials: M
authors.lastname: Li
authors.forename: Chunbo
authors.initials: C
authors.lastname: Qin
authors.forename: Ruth
authors.initials: R
authors.lastname: Welti
authors.forename: Xuemin
authors.initials: X
authors.lastname: Wang
mesh_terms: D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D019521:Body Patterning; D016297:Mutagenesis, Site-Directed; D010710:Phosphates / Q000378:metabolism*; D010712:Phosphatidic Acids / Q000096:biosynthesis; D010739:Phospholipase D / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D018517:Plant Roots / Q000033:anatomy & histology / Q000254:growth & development / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D010710:Phosphates; D010712:Phosphatidic Acids; D012333:RNA, Messenger; D010739:Phospholipase D; C474583:phospholipase Dzeta1, Arabidopsis; C510354:phospholipase Dzeta2, Arabidopsis