Leaf growth rate and nitrogen content determine respiratory costs during leaf expansion in grapevines

Respiration processes are well recognized as fundamental for the plant carbon balance, but little attention has been paid to the relationships among respiration rates, environment and genetic variability. This can be of particular interest to understand the differences in net carbon balances in crop...

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Bibliographic Details
Published in:Physiologia plantarum 2019-04, Vol.165 (4), p.746-754
Main Authors: Hernández‐Montes, Esther, Tomás, Magdalena, Escalona, José M., Bota, Josefina, Medrano, Hipolito
Format: Article
Language:English
Subjects:
Agricultural economics
Carbon
Carbon - metabolism
Cell Respiration - physiology
Costs
Cultivars
Expansion
Genetic variability
Grapevines
Growth rate
Leaf area
Leaves
Maintenance costs
Nitrogen
Nitrogen - metabolism
Photosynthesis - physiology
Plant growth
Plant Leaves - growth & development
Plant Leaves - metabolism
Respiration
Vitis - growth & development
Vitis - metabolism
Weight
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Summary:Respiration processes are well recognized as fundamental for the plant carbon balance, but little attention has been paid to the relationships among respiration rates, environment and genetic variability. This can be of particular interest to understand the differences in net carbon balances in crops as grapevines. Night respiration (Rn) and its associated growth (Rg) and maintenance (Rm) components were evaluated during leaf expansion in two grapevine cultivars (Tempranillo cv. and Garnacha cv.) that differ in their plant growth pattern and carbon balance. Simultaneously, leaf traits as leaf mass area, nitrogen (N) and carbon (C) content were evaluated in order to relate to the respiratory processes and the leaf growth. The results showed the differences in respiration rates associated with the leaf expansion pattern. Tempranillo developed leaves with higher leaf area and lower dry weight per leaf unit than Garnacha. Although differences between cultivars were observed in terms of growth costs in expanding leaves, the maintenance costs were similar for both cultivars. Also, a significant linear regression was found between respiration rates and N content in expanding and mature leaves. The results indicate that differences in structure and nitrogen content of expanding leaves may lead to respiratory differences between cultivars. These results also demonstrate the importance of respiratory cost components in carbon balance calculations in grapevines.
ISSN:0031-9317
1399-3054
DOI:10.1111/ppl.12769