NDLI: Differential tissue-specific expression of cysteine proteinases forms the basis for the fine-tuned mobilization of storage globulin during and after germination in legume seeds

Content Provider	Springer Nature Link
Author	Tiedemann, Jens Schlereth, Armin Müntz, Klaus
Copyright Year	2001
Abstract	The temporal and spatial distribution of cysteine proteinases (CPRs) was analyzed immunologically and by in situ hybridization to identify the CPRs involved in the initiation of storage-globulin degradation in embryonic axes and cotyledons of germinating vetch (Vicia sativa L.). At the start of germination several CPRs were found in protein bodies in which they might have been stored in the mature seeds. Cysteine proteinase 1 was predominantly found in organs like the radicle, which first start to grow during germination. Cysteine proteinase 2 was also present at the start of germination but displayed a less-specific histological pattern. Proteinase B was involved in the globulin degradation of vetch cotyledons as well. The histological pattern of CPRs followed the distribution of their corresponding mRNAs. The latter were usually detected earlier than the CPRs but the in situ hybridization signals were histologically not as restricted as the immunosignals. Proteolytic activity started in the radicle of the embryonic axis early during germination. Within 24 h after imbibition it had also spread throughout the whole shoot. At the end of germination, newly synthesized CPRs might have supplemented the early detectable CPRs in the axis. In the cotyledons, only the abaxial epidermis and the procambial strands showed proteinase localization during germination. Both CPR1 and CPR2, as well as the less common proteinase B, might have been present as stored proteinases. Three days after imbibition, proteolytic activity had proceeded from the cotyledonary epidermis towards the vascular strands deeper inside the cotyledons. The histochemical detection of the CPRs was in accordance with the previously described histological pattern of globulin mobilization in germinating vetch [Tiedemann J, et al. (2000)]. A similar link between the distribution of CPRs and globulin degradation was found in germinating seeds of Phaseolus vulgaris L. The coincidence of the histological patterns of globulin breakdown with that of the CPRs indicates that at least CPR1, CPR2 and proteinase B are responsible for bulk globulin mobilization in the seeds of the two legumes.
Starting Page	728
Ending Page	738
Page Count	11
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	212
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-04-12
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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