Cyclic photophosphorylation and electron transport

Evidence for an association of ndh B, ndh J gene products and ferredoxin‐NADP‐reductase as components of a chloroplastic NAD(P)H dehydrogenase complex

“…However, although the polypeptide products of three ndh genes (NDH H, NDH I, NDH K) have been found in thylakoid membranes of higher plants [4,5,6] it was not known whether ndh gene products are involved in a NAD(P)H dehydrogenase complex as it is the case in bacteria, cyanobacteria or mitochondria. Further, the occurrence of a NAD(P)H dehydrogenase complex in higher plant chloroplasts was recently seriously questioned [16]. Results presented in this paper supply evidence for a participation of both chloroplastic ndh B and ndh J gene products to a membrane thylakoid complex supporting NAD(P)H dehydrogenase activity.…”

“…Bendall and Manasse in a recent review [16] concluded that FNR associated to FQR (ferredoxin-PQ reductase) rather than a NAD(P)H dehydrogenase would be involved in that reaction. It appears from this work that the NAD(P)H dehydrogenase complex formed by the association of ndh gene products with FNR, rather than the still unidentified FQR, is most likely the functional complex involved in the reduction of the PQ pool.…”

“…isolated and characterized. Evidence for the existence of a chloroplastic NAD(P)H dehydrogenase complex has been reported in Chlamydomonas [14,15], but until now the existence of a NAD(P)H dehydrogenase complex in higher plants chloroplasts is still a matter of debate [16] and the participation of the ndh gene products to the putative NAD(P)H dehydrogenase complex remains to be proved.…”

Characterization of the High-Spin Heme x in the Cytochrome b6f Complex of Oxygenic Photosynthesis

“…Moreover, work on C3 plants suggests that electron transport is apparently inhibited by mutation of a Fd:PQ oxidoreductase and a NADPH:PQ oxidoreductase (38). This implies that the major physiological pathway for reduction of PQ from stromal reductants might not include the cyt b 6 f complex (39).…”

The chloroplast Ndh complex mediates the dark reduction of the plastoquinone pool in response to heat stress in tobacco leaves

“…Although an intact Ndh complex is dispensible for growth of tobacco under`unstressed' growth conditions it is possible that the activity of the Ndh complex becomes more important under stress conditions that require enhanced ATP synthesis possibly driven by cyclic electron £ow around PSI [5]. In this paper we investigate whether the Ndh complex plays a role in the response of plants to heat stress, a treatment that induces signi¢cant changes to electron £ow within the chloroplast [7,8].…”