Photosynthetica 1998, 35(2):233-240 | DOI: 10.1023/A:1006910823378

Photosynthesis and Chlorophyll Fluorescence in Two Hybrids of Sorghum under Different Nitrogen and Water Regimes

I. Cechin1
1 Departamento de Botánica, Universidade Federal de São Carlos, São Carlos, SP, Brasil

In two hybrids of sorghum (Sorghum bicolor Moench.), C51 and C42, high nitrogen concentration (HN) increased net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) of well watered (HW) plants. Water stressing (LW plants) resulted in low PN, gs, and E in both hybrids, but the values were still higher in HN plants as compared to low nitrogen-grown (LN) plants. Intercellular CO2 concentration (Ci) increased in droughted plants. This increase was much higher in LN plants as compared to HN plants. Instantaneous water use efficiency was lower in LN plants as a consequence of a greater effect of water stress on photosynthesis. Leaf water potential was reduced by water stress in all treatments. Analysis of chlorophyll a fluorescence at room temperature showed that photosystem 2 (PS2) was rather tolerant to the water stress imposed. Water stress caused a slight decrease in the efficiency of excitation capture by open PS2 reaction centres (Fv/Fm). The in vivo quantum yield of PS2 photochemistry (ΦPS2) and the photochemical quenching coefficient (qP) were slightly reduced, while the nonphotochemical quenching coefficient (qN) was increased under the water stress. However, in hybrid C42 these characters were little or not affected by the water stress.

Additional key words: drought; intercellular CO2 concentration; leaf water potential; photosystem 2; Sorghum bicolor; stomatal conductance; transpiration rate; water use efficiency

Prepublished online: June 1, 1998; Published: January 1, 1998  Show citation

ACS AIP APA ASA Harvard Chicago Chicago Notes IEEE ISO690 MLA NLM Turabian Vancouver
Cechin, I. (1998). Photosynthesis and Chlorophyll Fluorescence in Two Hybrids of Sorghum under Different Nitrogen and Water Regimes. Photosynthetica, 35(2), 233-240. doi: 10.1023/A:1006910823378
Share...
Download citation
  • BibTeX (.bib)
  • Bookends (.ris)
  • EasyBib (.ris)
  • EndNote (.enw)
  • EndNote 8 (.xml)
  • ISI WoS (.isi)
  • Medlars (.medlars)
  • Mendeley (.ris)
  • MODS (.xml)
  • Papers (.ris)
  • RefWorks (.txt)
  • RefManager (.ris)
  • RIS (.ris)
  • MS Word (.xml)
  • Zotero (.ris)
    • Open full article

    References

    1. Baker, N.R.: A possible role for photosystem II in environmental perturbations of photosynthesis.-Physiol. Plant. 81: 563-570, 1991. Go to original source...
    2. Caemmerer, S. von, Farquhar, G.D.: Some relationships between the biochemistry of photosynthesis and the gas exchange of leaves.-Planta 153: 376-387, 1981. Go to original source...
    3. Farqubar, G. D., Sharkey, T.D.: Stomatal conductance and photosynthesis.-Annu. Rev. Plant Physiol. 33: 317-345, 1982. Go to original source...
    4. Genty, B., Briantais, J.-M., Baker, N.R.: The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence.-Biochim. biophys. Acta 990: 87-92, 1989. Go to original source...
    5. Green, T.H., Mitchell, R.J.: Effects of nitrogen on the response of loblolly pine to water stress. I. Photosynthesis and stomatal conductance.-New Phytol. 122: 627-633, 1992. Go to original source...
    6. He, J.X., Wang, J., Liang, H.G.: Effects of water stress on photochemical function and protein metabolism of photosystem II in wheat leaves.-Physiol. Plant. 93: 771-777, 1995. Go to original source...
    7. Hewitt, E.J.: Sand and Water Culture Methods Used in the Study of Plant Nutrition.-Commonwealth Agricultural Bureau, Farnham Royal 1966.
    8. Huber, S.C., Sugiyama, T., Alberte, R.S.: Photosynthetic determinants of growth in maize plants: Effects of nitrogen nutrition on growth, carbon fixation and photochemical features.-Plant Cell Physiol. 30: 1063-1072, 1989. Go to original source...
    9. Lal, A., Edwards, G.E.: Analysis of inhibition of photosynthesis under water stress in the C4 species Amaranthus cruentus and Zea mays: electron transport, CO2 fixation and carboxylation capacity. Aust. J. Plant Physiol. 23: 403-412, 1996. Go to original source...
    10. Loreto, F., Tricoli, D., Di Marco, G.: On the relationship between electron transport rate and photosynthesis in leaves of the C4 plant Sorghum bicolor exposed to water stress, temperature changes and carbon metabolism inhibition.-Aust. J. Plant Physiol. 22: 885-892, 1995. Go to original source...
    11. Matthews, M.A., Boyer, J.S.: Acclimation of photosynthesis to low leaf water potentials.-Plant Physiol. 74: 161-166, 1984. Go to original source...
    12. Morgan, J.A.: The effects of N nutrition on the water relations and gas exchange characteristics of wheat (Triticum aestivum L.).-Plant Physiol. 80: 52-58, 1986. Go to original source...
    13. Radin, J.W., Ackerson, R.C.: Water relations of cotton plants under nitrogen deficiency. III. Stomatal conductance, photosynthesis, and abscisic acid accumulation during drought.-Plant Physiol. 67: 115-119, 1981. Go to original source...
    14. Ranjith, S.A., Meinzer, F.C., Perry, M.H., Thom, M.: Partitioning of carboxylase activity in nitrogen-stressed sugarcane and its relationship to bundle sheath leackiness to CO2, photosynthesis and carbon isotope discrimination.-Aust. J. Plant Physiol. 22: 903-911, 1995. Go to original source...
    15. Ruban, A.V., Horton, P.: Regulation of non-photochemical quenching of chlorophyll fluorescence in plants.-Aust. J. Plant Physiol. 22: 221-230, 1995. Go to original source...
    16. Sage, R.F., Pearcy, R.W., Seemann, J. R.: The nitrogen use efficiency of C3 and C4 plants. III. Leaf nitrogen effects on the activity of carboxylating enzymes in Chenopodium album (L.) and Amaranthus retroflexus (L.).-Plant Physiol. 85: 355-359, 1987. Go to original source...
    17. Saliendra, N.Z., Meinzer, F.C., Perry, M., Thom, M.: Associations between partitioning of carboxylase activity and bundle sheath leakiness to CO2, carbon isotope discrimination, photosynthesis, and growth in sugarcane.-J. exp. Bot. 47: 907-914, 1996. Go to original source...
    18. Sugiharto, B., Miyata, K., Nakamoto, H., Sasakawa, H., Sugiyama, T.: Regulation of expression of carbon-assimilating enzymes by nitrogen in maize leaf.-Plant Physiol. 92: 963-969, 1990. Go to original source...
    19. Sugiyama, T., Mizuno, M., Hayashi, M., Partitioning of nitrogen among ribulose-1,5-bisphosphate carboxylase/oxygenase, phosphoenolpyruvate carboxylase, and pyruvate orthophosphate dikinase as related to biomass productivity in maize seedlings.-Plant Physiol. 75: 665-669, 1984. Go to original source...
    20. Wise, R.R., Frederick, J.R., Alm, D.M., Kramer, D.M., Hesketh, J.D., Crofts, A.R., Ort, O.R.: Investigation of the limitations to photosynthesis induced by leaf water deficit in field-grown sunflower (Helianthus annuus L.).-Plant Cell Environ. 13: 923-931, 1990. Go to original source...

    Return to the content