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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gomes Filho, Enéas Lima, Carmen Rogélia Farias Machado Costa, José Hélio Silva, Ana Cláudia Marinho Guia Silva Lima, Maria Lacerda, Claudivan Feitosa Prisco, José Tarquinio |
| Copyright Year | 2007 |
| Abstract | Pitiúba cowpea [Vigna unguiculata (L.) Walp] seeds were germinated in distilled water (control treatment) or in 100 mM NaCl solution (salt treatment), and RNase was purified from different parts of the seedlings. Seedling growth was reduced by the NaCl treatment. RNase activity was low in cotyledons of quiescent seeds, but the enzyme was activated during germination and seedling establishment. Salinity reduced cotyledon RNase activity, and this effect appeared to be due to a delay in its activation. The RNases from roots, stems, and leaves were immunologically identical to that found in cotyledons. Partially purified RNase fractions from the different parts of the seedling showed some activity with DNA as substrate. However, this DNA hydrolyzing activity was much lower than that of RNA hydrolyzing activity. The DNA hydrolyzing activity was strongly inhibited by Cu2+, Hg2+, and Zn2+ ions, stimulated by MgCl2, and slowly inhibited by EDTA. This activity from the most purified fraction was inhibited by increasing concentrations of RNA in the reaction medium. It is suggested that the major biological role of this cotyledon RNase would be to hydrolyze seed storage RNA during germination and seedling establishment, and it was discussed that it might have a protective role against abiotic stress during later part of seedling establishment. |
| Starting Page | 147 |
| Ending Page | 157 |
| Page Count | 11 |
| File Format | |
| ISSN | 07217714 |
| Journal | Plant Cell Reports |
| Volume Number | 27 |
| Issue Number | 1 |
| e-ISSN | 1432203X |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2007-09-27 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Enzyme effectors Nuclease RNase Salinity Vigna unguiculata Plant Biochemistry Biotechnology Plant Sciences Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Medicine Agronomy and Crop Science |
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