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Table 1 Description of measured traits in the tropical japonica rice panel grown in greenhouse

From: Phenotyping Root Systems in a Set of Japonica Rice Accessions: Can Structural Traits Predict the Response to Drought?

Trait Abbreviation Description Unit
Root length at 20 cm RL20 Total root length in the 0 to 20 cm layer cm
Root length at 40 cm RL40 Total root length in the 20 to 40 cm layer cm
Root length at 60 cm RL60 Total root length in the 40 to 60 cm layer cm
Root volume at 20 cm RV20 Total root volume in the 0 to 20 cm layer cm3
Root volume at 40 cm RV40 Total root volume in the 20 to 40 cm layer cm3
Root volume at 60 cm RV60 Total root volume in the 40 to 60 cm layer cm3
Root diameter at 20 cm RD20 Average root diameter in the 0 to 20 cm layer mm
Root diameter at 40 cm RD40 Average root diameter in the 20 to 40 cm layer mm
Root diameter at 60 cm RD60 Average root diameter in the 40 to 60 cm layer mm
Fine root length at 20 cm FRL20 Total root length with diameter ≤ 0.5 mm at 20 cm cm
Fine root length at 40 cm FRL40 Total root length with diameter ≤ 0.5 mm at 40 cm cm
Fine root length at 60 cm FRL60 Total root length with diameter ≤ 0.5 mm at 60 cm cm
Thick root length at 20 cm TRL20 Total root length with 1.0 mm ≤ diameter ≤ 2.5 mm at 20 cm cm
Thick root length at 40 cm TRL40 Total root length with 1.0 mm ≤ diameter ≤ 2.5 mm at 40 cm cm
Thick root length at 60 cm TRL60 Total root length with 1.0 mm ≤ diameter ≤ 2.5 mm at 60 cm cm
Maintenance coefficient of fine roots between 20 and 40 cm \( {\upalpha}_{FR{L}_{20\_40}} \) Ratio between fine root length at 40 cm and fine root length at 20 cm
Maintenance coefficient of fine roots between 40 and 60 cm \( {\upalpha}_{FR{L}_{40\_60}} \) Ratio between fine root length at 60 cm and fine root length at 40 cm
Maintenance coefficient of thick roots between 20 and 40 cm \( {\upalpha}_{TR{L}_{20\_40}} \) Ratio between thick root length at 40 cm and thick root length at 20 cm
Maintenance coefficient of thick roots between 40 and 60 cm \( {\upalpha}_{TR{L}_{40\_60}} \) Ratio between thick root length at 60 cm and thick root length at 40 cm
Branching index at 20 cm BI20 Ratio between fine root length at 20 cm and thick root length at 20 cm
Branching index at 40 cm BI40 Ratio between fine root length at 40 cm and thick root length at 40 cm
Branching index at 60 cm BI60 Ratio between fine root length at 60 cm and thick root length at 60 cm
Total root length TOTRL Sum of root lengths at 20 cm, 40 cm and 60 cm cm
Total root volume TOTVOL Sum of root volumes at 20 cm, 40 cm and 60 cm cm3
Thick root diameter at 20 cm DIAM _ TR20 Thick root diameter at 20 cm mm
Thick root diameter at 40 cm DIAM _ TR40 Thick root diameter at 40 cm mm
Thick root diameter at 60 cm DIAM _ TR60 Thick root diameter at 60 cm mm
Thick root diameter reduction between 20 and 60 cm \( {RED}_{T{R}_{20_{60}}} \) Difference ratio between thick root diameters between 20 and 60 cm %
Shoot dry weight SDW Shoot biomass of one plant target g plant-1