Cloning of genes whose expression is correlated with mitosis and localized in dividing cells in root caps of Pisum sativum L.
Removal of border cells from pea roots synchronizes and induces root cap cell division, wall biogenesis and differentiation. Three messages which are expressed differentially in such induced root caps have been cloned. Sequence analyses showed that the PsHRGP1-encoded protein has high homology with a homology with a hydroxyproline-rich glycoprotein. The PsCaP23-encoded protein has high homology with an alfalfa callus protein or translationally controlled human or mouse tumor protein P23. The PsRbL41-encoded protein has high homology with a highly basic 60S ribosomal protein L41. In situ hybridization showed that PsHRGP1. PsCaP23 and PsRbL41 messages are localized within dividing cells of the root cap. PsHRGP1 is highly expressed in uninduced root caps, but its message is repressed by 10-11 times as soon as cell division and differentiation begin. Expression of PsHRGP1 recovers to higher than (180%) its initial level in 30 min. PsHRGP1 is root-specific. PsCaP23 and PsRbL41 messages increase ca. 3-fold within 15 min after root cap induction. All three genes represent small families of 3-5 closely related genes in the pea genome.
Woo
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HH
Department of Plant Pathology, University of Arizona, Tucson 85721, USA.
Hawes
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MC
D000595:Amino Acid Sequence; D002454:Cell Differentiation / Q000235:genetics; D002455:Cell Division / Q000235:genetics; D002473:Cell Wall / Q000235:genetics; D003001:Cloning, Molecular; D018507:Gene Expression Regulation, Developmental; D017343:Genes, Plant; D006023:Glycoproteins / Q000737:chemistry / Q000235:genetics; D008938:Mitosis / Q000235:genetics*; D008969:Molecular Sequence Data; D005810:Multigene Family; D018532:Pisum sativum / Q000166:cytology / Q000235:genetics*; D010940:Plant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D018518:Plant Root Cap / Q000235:genetics* / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism; D011506:Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D012269:Ribosomal Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics
D006023:Glycoproteins; D010940:Plant Proteins; D011506:Proteins; D012333:RNA, Messenger; D012269:Ribosomal Proteins; C109820:callus protein P23 protein, Pisum sativum; C005488:extensin protein, plant; C076844:RPL41 protein, human