Effects of drought stress on the photosynthetic physiological parameters of Populus × euramericana “Neva”
- 34 Downloads
Populus × euramericana “Neva” is the main poplar species in China, where drought stress is becoming extremely urgent. We carried out this research to study the effects of drought stress on the photosynthesis of Populus × euramericana “Neva”. Drought stress was induced by 58–62% (light), 48–52% (moderate), and 38–42% (severe) relative soil moisture content (RSMC). The effects of drought stress on photosynthetic rate, chlorophyll fluorescence parameters, and other related physiological parameters were investigated during treatment. Net photosynthetic rate (PN), and stomatal conductance decreased significantly and intercellular CO2 concentration initially increased and then declined, whereas the stomatal limitation factors showed opposite trends in the light under moderate drought stress. Photosystem II (PSII) maximum photochemical efficiency, actual photochemical efficiency, and photochemical quenching decreased gradually under drought stress, whereas nonphotochemical quenching initially increased and then declined. Superoxide dismutase, peroxidase, and catalase activities initially increased and then decreased as RSMC was reduced, whereas malondialdehyde (MDA) content and relative electric conductivity (REC) increased gradually. These results suggest that stomatal factors accounted for the decline in PN under light and moderate drought stress, whereas leaf PN decreased mainly due to non-stomatal factors under severe drought stress. PSII was damaged; thus, photosynthetic electron transfer was restricted, indicating that heat dissipation is important for the light protection mechanism of plants. Antioxidant enzymes increased at the beginning of treatment, and the increased MDA and REC led to cell membrane damage. These results suggest that poplar seedlings stabilized their photosynthetic apparatus by reducing the light trapping ability under light and moderate drought stress conditions. This helped dissipate heat and enhance antioxidant enzyme activity. Stomatal factors accounted for the decline in PN, whereas damage to PSII and antioxidant enzymes under severe drought stress suggested that the decline in PN was caused by non-stomatal restrictive factors.
KeywordsPoplar seedlings Drought stress Gas exchange Chlorophyll fluorescence Antioxidant enzymes
Compliance with ethical standards
Conflict of interest
Guoting Liang and Jianwen Bu contributed equally to this study.
- Berry JA, Downton WJS (1982) Environmental regulation of photosynthesis. In: Govindjeed. Photosynth. Vol.II. Academic Press, New York, p 263–343Google Scholar
- Li HS (2000) Experimental principle and technique for plant physiology and biochemistry, vol 1. Higher Education Press, Beijing, pp 167–261Google Scholar
- Li Y, Hu T, Duan X, Zeng F (2013) Effects of decomposing leaf litter of eucalyptus grandis on the growth and photosynthetic characteristics of lolium perenne. J Agric Sci 5(3):123–131Google Scholar
- Liu JC, Zhong ZC, He YJ (2007) Influence of drought stress on the gas exchange of cupressus funebris endl. seedlings of different ages in the limestone area of Chongqing, China. Acta Ecol Sin 27(9):3601–3608Google Scholar
- Mckew BA, Davey P, Finch SJ, Hopkins J, Lefebvre SC, Metodiev MV et al (2013) The trade-off between the light-harvesting and photoprotective functions of fucoxanthin-chlorophyll proteins dominates light acclimation in emiliania huxleyi, (clone ccmp 1516). New Phytol 200(1):74–85CrossRefPubMedGoogle Scholar
- Scott MJ, Daly DS, Hejazi MI, Kyle GP, Liu L, Mcjeon HC, Mundra A, Patel PL, Rice JS, Voisin N (2016) Sensitivity of future U.S. water shortages to socioeconomic and climate drivers: a case study in Georgia using an integrated human-earth system modeling framework. Clim Change 136:1–14CrossRefGoogle Scholar
- Sigaud P (1999) Poplar genetic conservation and use in China, with special attention to North China. FAO, Online Catalogues, Rome (Italy), p 11Google Scholar
- Ustuner B, Alcay S, Toker MB, Nur Z, Gokce E, Sonat FA, Gul Z, Duman M, Ceniz C, Uslu A, Sagirkaya H, Soylu MK (2015) Effect of rainbow trout (oncorhynchus mykiss) seminal plasma on the post-thaw quality of ram semen cryopreserved in a soybean lecithin-based or egg yolk-based extender. Anim Reprod Sci 164:97–104CrossRefPubMedGoogle Scholar
- Varone L, Ribas-Carbo M, Cardona C, Gallé A, Medrano H, Gratani L, Flexas J (2012) Stomatal and non-stomatal limitations to photosynthesis in seedlings and saplings of mediterranean species pre-conditioned and aged in nurseries: different response to water stress. Environ Exp Bot 75(74):235–247CrossRefGoogle Scholar