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Effects of low temperature and low irradiance on the physiological characteristics and related gene expression of different pepper species

  • Original Papers
  • Published:
Photosynthetica

Abstract

Pepper is a thermophilous and heliophilic vegetable. In China, pepper is grown in greenhouse during winter and spring under lower temperature and irradiation. In this study, we investigated the effects of low temperature and low irradiance (LTLI) on the physiological characteristics and the expression of related genes in five pepper species, Capsicum annuum L. (CA), C. baccatum L. (CB), C. chinense Jacquin (CC), C. frutescens L. (CF), and C. pubescens Ruiz & Pavon (CP) in order to screen for greenhouse species that is resistant to such adverse conditions. We observed significant reductions not only in photosynthetic pigments and stomatal conductance but also in proline, total soluble sugar, enzyme activity, and root activity; disordered arrangements of leaf palisade and spongy tissues; and first rising and then falling expression of C-repeat binding factor (CBF3) and cold-regulated genes (CORc410). These results indicate that pepper is not resistant to LTLI. We also found that CP showed significantly higher photosynthetic activity, more proline and total soluble sugar, higher enzyme activity, higher root activity, higher CBF3 and CORc410 expression levels, more tightly packed leaf palisade and spongy tissues, and thicker bundle sheath than the other four species did under LTLI, while CF exhibited the lowest values for these indicators. It demonstrated significant differences in the ability to resist to LTLI among different species, with CP showing the strongest resistance, followed by CB. Therefore, we recommend the introduction of CP and CB to greenhouse cultivation to further screen for low temperature and low light-resistant pepper varieties to increase pepper production by strengthening intervariety hybridization.

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Abbreviations

CA:

Capsicum annuum L.

Car:

carotenoids

CAT:

catalase

CB:

Capsicum baccatum L.

CBF3 :

C-repeat binding factor

CC:

Capsicum chinense Jacquin

CF:

Capsicum frutescens L.

Chl:

chlorophyll

CORc410 :

cold-regulated gene

CP:

Capsicum pubescens Ruiz & Pavon

E :

transpiration rate

Fm :

maximal fluorescence

Fm′:

maximal fluorescence under light

FM:

fresh mass

F0 :

minimal initial fluorescence

F0′:

minimal fluorescence

g s :

stomatal conductance

GR:

glutathione reductase

LTLI:

low temperature and low irradiance

qN :

nonphotochemical quenching

qP :

photochemical quenching

P N :

net photosynthetic rate

SOD:

superoxide dismutase

POD:

peroxidase

WUE:

water-use efficiency

ΦPSII :

actual photochemical efficiency of PSII in the light

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Correspondence to X. X. Zou.

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Acknowledgements: This work was supported by China Agriculture Research System (CARS-25-A-8).The first two authors contributed equally to the paper.

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Ou, L.J., Wei, G., Zhang, Z.Q. et al. Effects of low temperature and low irradiance on the physiological characteristics and related gene expression of different pepper species. Photosynthetica 53, 85–94 (2015). https://doi.org/10.1007/s11099-015-0084-7

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  • DOI: https://doi.org/10.1007/s11099-015-0084-7

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