Abstract:
:Three methods of estimating photorespiratory rate in leaves of the C3-C4 intermediate species Moricandia arvensis and the related C3 species Moricandia moricandioides were compared. The results indicated that the photorespiratory rate in M. arvensis is less than in M. moricandioides, and that this is caused partly by reduced carbon flux through the photorespiratory pathway, and partly by the presence of a mechanism for enhanced photorespiratory CO2 reassimilation in the intermediate species. Measurements of the CO2 compensation point (Γ) in the two species supported this conclusion. A functional C4 pathway is unlikely to be involved in the reduction of photorespiratory rate in M. arvensis since pulse-chase experiments showed that carbon did not move from C4 acids to the reductive pentose-phosphate pathway in attached leaves under steady-state conditions at Γ.
journal_name
Plantajournal_title
Plantaauthors
Hunt S,Smith AM,Woolhouse HWdoi
10.1007/BF00391098subject
Has Abstractpub_date
1987-06-01 00:00:00pages
227-34issue
2eissn
0032-0935issn
1432-2048journal_volume
171pub_type
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