Inhibition of nitrate reductase induction in germinating barley embryos by endosperm

Gupta, Aditya K. ; Sharma, Arun K. ; Guha-Mukherjee, S. ; Sopory, Sudhir K. (1988) Inhibition of nitrate reductase induction in germinating barley embryos by endosperm Plant Science, 54 (2). pp. 141-145. ISSN 0168-9452

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016894...

Related URL: http://dx.doi.org/10.1016/0168-9452(88)90092-1

Abstract

A lag phase of 24 h has been found in the induction of nitrate reductase (NR) in barley seeds. This lag phase was eliminated if the embryos were detached from the endosperm and incubated in nitrate. In detached embryos the NR activity was detected as early as 4 h of germination, and maximum activity was observed at 12 h. Induction of NR in detached embryos was not affected by actinomycin D, inhibited by 67% in the presence of cordycepin and completely inhibited by cycloheximide. Endosperm exudate inhibited the induction of NR in detached embryos. Nitrate accumulation was found to be same in attached and detached embryos and accumulation was not affected by the inhibitors. The study suggests that an endogenous factor is present which inhibits the induction of NR during the first 24 h of germination in intact barley seeds.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Nitrate; Nitrate Reductase; Endosperm; Embryos; Barley
ID Code:15659
Deposited On:13 Nov 2010 12:46
Last Modified:02 Jun 2011 07:36

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