+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Regulation of Photosynthetic Induction State in High- and Low-Light-Grown Soybean and Alocasia macrorrhiza (L.) G. Don

Plant Physiology 109(1): 307-317
Regulation of Photosynthetic Induction State in High- and Low-Light-Grown Soybean and Alocasia macrorrhiza (L.) G. Don
Alocasia (Alocasia macrorrhiza [L.] G. Don) and soybean (Glycine max [L.]) were grown under high or low photon flux density (PFD) conditions to achieve a range of photosynthetic capacities and light-adaptation modes. The CO2 assimilation rate and in vivo linear electron transport rate (Jf) were determined over a range of PFDs and under saturating 1-s-duration lightflecks applied at a range of frequencies. At the same mean PFD, the assimilation rate and the Jf were lower under the lightfleck regimes than under constant light. The activation state of two, key enzymes of the photosynthetic carbon reduction cycle pathway, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and fructose-1,6-bisphosphatase, and the photosynthetic induction states (ISs) were also found to be lower under flashing as compared to continuous PFD. Under all conditions, the IS measured 120 s after an increase in PFD to constant and saturating values was highly correlated with the Rubisco activation state and stomatal conductances established in the light regime before the increase. Both the fructose-1,6-bisphosphatase and Rubisco activities established in a particular light regime were highly correlated with the mean Jf in that regime. The relationships between enzyme activation state and Jf and between IS and enzyme activation state were similar in soybean and Alocasia and were not affected either by growth-light regime, and hence photosynthetic capacity, or by flashing versus constant PFD. The common relationship between the linear Jf and the activation state of key enzymes suggests that electron transport may be the determinant of the signal regulating IS, at least to the extent that the IS is controlled by the activation state of key stromal enzymes.

(PDF same-day service: $19.90)

Accession: 002941248

PMID: 12228597

DOI: 10.2307/4276804

Related references

Response of leaf anatomy and photosynthetic capacity in Alocasia macrorrhiza (Araceae) to a transfer from low to high light. American Journal of Botany 79(4): 449-455, 1992

Photosynthetic characteristics of a tropical forest understory herb alocasia macrorrhiza and a related crop species colocasia esculenta grown in contrasting light environments. Oecologia (Berlin) 79(1): 53-59, 1989

Photosynthesis in flashing light in soybean leaves grown in different conditions. 1. Photosynthetic induction state and regulation of ribulose-1,5-bisphosphate carboxylase activity. Plant, Cell and Environment 15(5): 569-576, 1992

Gas Exchange Analysis of the Fast Phase of Photosynthetic Induction in Alocasia macrorrhiza. Plant Physiology 87(4): 818-821, 1988

The costs and benefits of photosynthetic acclimation to light environment in Alocasia macrorrhiza. Dissertation Abstracts International B, Sciences and Engineering 52(2): 618B, 1991

Gas Exchange Analysis of the Relative Importance of Stomatal and Biochemical Factors in Photosynthetic Induction in Alocasia macrorrhiza. Plant Physiology 86(3): 782-785, 1988

Relative growth rates of alocasia macrorrhiza grown under uniform and fluctuating light. Bulletin of the Ecological Society of America 72(2 SUPPL): 249-250, 1991

Regulation of photosynthesis under flashing and constant light in Glycine max and Alocasia macrorrhiza. Plant Physiology (Rockville) 105(1 SUPPL ): 76, 1994

Photosynthesis and respiration in alocasia macrorrhiza following transfers to high and low light. Oecologia (Berlin) 86(3): 447-453, 1991

Photosynthetic induction state of leaves in a soybean canopy in relation to light regulation of ribulose-1-5-bisphosphate carboxylase and stomatal conductance. Plant Physiology 94(2): 628-633, 1990