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- Title
Involvement of photobleaching and inhibition of protochlorophyll(ide) accumulation in tentoxin effects on greening of mung bean seedlings.
- Authors
Wickliff, James L.; Duke, Stephen O.; Vaughn, Kevin C.
- Abstract
Several types of evidence indicate that tentoxin-caused reduction of chlorophyll accumulation in greening primary leaves of mung bean [Vigna radiata (L.) Wilczek cv. Berken] is due to both photobleaching and decreased protochlorophyll(ide) synthesis. Greening was greater under dim (2.5 μmol m-2 s-l) far-red or white light than under bright (180 to 200 μmol m-2 s-1) white light in tentoxin-treated tissues, whereas there was a positive correlation between fluence rate and greening in control tissues. Under continuous white light (100 μmol m-2 s-1) chlorophyll(ide) accumulation was slower in tentoxin-treated than in control tissues, This was caused by greater photobleaching of newly formed chlorophyll(ide), as well as by decreased protochlorophyll(ide) synthesis. Photobleaching did not affect protochlorophyll(ide) synthesis in control or tentoxin-treated tissues. Chlorophyll(ide) was less stable in tentoxin-treated than in control tissues during a 24 h period ,of darkness. Plastids of tentoxin-treated tissues had all of the chlorophyll-proteins of control plants. Etioplasts of tentoxin-treated plants contained normal galactolipid contents, but galactolipids in these plants were greatly reduced in white light. Reduced chlorophyll accumulation caused by tentoxin is apparently the result of both photodestruction and of reduced synthesis of chlorophyll.
- Subjects
PROTOCHLOROPHYLLIDE; PLANT cells &; tissues; PHOTORECEPTORS; BIOMOLECULES; LEGUMES; PROTEINS; TENTOXIN
- Publication
Physiologia Plantarum, 1982, Vol 56, Issue 4, p399
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1982.tb04532.x