Both rubisco and phosphoenolpyruvate carboxylase are beneficial for stomatal function in epidermal strips of Commelina benghalensis

Parvathi, K. ; Raghavendra, A. S. (1997) Both rubisco and phosphoenolpyruvate carboxylase are beneficial for stomatal function in epidermal strips of Commelina benghalensis Plant Science, 124 (2). pp. 153-157. ISSN 0168-9452

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S01689...

Related URL: http://dx.doi.org/10.1016/S0168-9452(97)04601-3

Abstract

The relative importance of the Calvin cycle and β-carboxylation, through phosphoenolpyruvate carboxylase (PEPC), pathways was assessed in relation to stomatal opening in epidermal strips of Commelina benghalensis, using D,L-glyceraldehyde (an inhibitor of the Calvin cycle) and 3,3-dichloro-2-dihydroxyphosphinoyl-methyl-2-propenoate (DCDP, an inhibitor of PEPC) or metabolites related to the Calvin cycle or PEPC. Stomatal opening was markedly inhibited by both DCDP and D,L-glyceraldehyde. In the absence of these inhibitors, exogenous metabolites such as PEP or ribose-5-P (R-5-P) had little or no effect on stomatal opening. On the other hand, in the presence of DCDP or D,L-glyceraldehyde, metabolites related to not only PEPC (PEP or malate) but also the Calvin cycle (R-5-P or PGA) relieved the inhibition of stomatal opening. We suggest that both Calvin cycle and β-carboxylation activity are beneficial for stomatal opening, particularly when either of these pathways is restricted.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Guard Cells; Rubisco; Commelina benghalensis; PEP Carboxylase; Stomata
ID Code:40224
Deposited On:23 May 2011 05:31
Last Modified:23 May 2011 05:31

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