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

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• 作者：L. J. Ou (1)
  G. Wei (1)
  Z. Q. Zhang (1)
  X. Z. Dai (1)
  X. X. Zou (1)
  
  1. Vegetable Institution of Hunan Academy of Agricultural Science ; Hunan Changsha ; 410125 ; China
  
• 关键词：adventitious root ; catalase ; chlorophyll content ; osmotic substances ; photosynthesis ; superoxide dismutase
• 刊名：Photosynthetica
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：53
• 期：1
• 页码：85-94
• 全文大小：1,660 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-9058

文摘

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.