Relationship between Photoconvertible and Nonphotoconvertible Protochlorophyllides |
| |
Authors: | Murray A E Klein A O |
| |
Affiliation: | Department of Biology, Brandeis University, Waltham, Massachusetts 02154. |
| |
Abstract: | Two forms of protochlorophyllide are found in dark-grown bean (Phaseolus vulgaris, var. Black Velentine) leaves, one (protochlorophyllide650) which is directly photoconvertible to chlorophyllide and another (protochlorophyllide632) which is not. Dark-grown leaves placed in solutions of δ-aminolevulinic acid accumulate protochlorophyllide632. Protochlorophyllide650 and protochlorophyllide632 can be partially separated on sucrose density gradients. A nitrogen atmosphere blocks chlorophyll synthesis in light or the regeneration of protochlorophyllide650 in the dark, even in the presence of excess δ-aminolevulinic acid, except when a stockpile of protochlorophyllide632 is present in the leaf. Under the latter conditions chlorophyll synthesis or protochlorophyllide650 regeneration is accompanied by a decrease in protochlorophyllide632. These experiments suggest that protochlorophyllide632 may be converted to protochlorophyllide650. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|