| Title: |
Assessment of water deficit in coffee plants under organic and conventional management using δ13C and leaf functional traits [FNA43] |
| Authors: |
Bernardo, Thamires; Vezzone, Mariana; Felizardo, João Paulo; Rodrigues, Camila; Moura, Waldenia; Soares, Luciana Gomes; Nakamya, Janice; Vantyghem, Mathilde; Dercon, Gerd; dos Anjos, Roberto Meigikos |
| Source: |
Book of Abstracts V Simpósio do INCT-FNA |
| Publisher Information: |
INCT-FNA |
| Publication Year: |
2025 |
| Collection: |
CIRAD: Agritrop (Centre de coopération internationale en recherche agronomique pour le développement) |
| Description: |
Stable isotope techniques have become powerful tools in applied nuclear physics, enabling the investigation of biological and environmental processes. In agricultural systems, carbon isotope composition (δ13C) of the bulk leaf tissue provides an integrated measure of plant water use efficiency under varying environmental conditions. Climate change has intensified water deficit stress in tropical crops such as coffee, one of Brazil's major export crops, which is highly sensitive to water availability. In this study, δ13C of bulk leaf tissues was employed as an indicator of long-term water status in coffee plants cultivated under organic (cow manure) and conventional (fertilizer) management systems. In addition, Leaf Mass per Area (LMA) and leaf temperature were evaluated to understand how management type influences water deficit. Leaf samples were collected at three different heights within the canopy (bottom, middle, and top). Results showed a consistent vertical pattern in both management systems (p < 0.001), with δ13C values becoming gradually less negative toward the upper canopy, reflecting reduced isotopic fractionation associated with lower stomatal conductance under higher evaporative demand. Differences between organic and conventional management were statistically significant but small (p = 0.002 for δ13C and p = 0.010 for LMA), suggesting that management type slightly mitigates water stress. Since organic systems have a higher organic matter input to the soil, this likely increases the soil water holding capacity, helping to buffer water deficit. The positive correlation between δ13C and LMA was stronger under organic management (r = 0.634) than under conventional (r = 0.246), indicating that denser leaves in the organic system may respond more conservatively to water deficit. Leaf temperature varied mainly with the time of measurement, reflecting solar radiation effects and representing a methodological limitation. These results demonstrate the sensitivity of δ13C and LMA as complementary ... |
| Document Type: |
conference object |
| File Description: |
text |
| Language: |
English |
| Relation: |
http://agritrop.cirad.fr/616759/; Assessment of water deficit in coffee plants under organic and conventional management using δ13C and leaf functional traits [FNA43]. Bernardo Thamires, Vezzone Mariana, Felizardo João Paulo, Rodrigues Camila, Moura Waldenia, Soares Luciana Gomes, Nakamya Janice, Vantyghem Mathilde, Dercon Gerd, dos Anjos Roberto Meigikos. 2025. In : Book of Abstracts V Simpósio do INCT-FNA. Niteroi : INCT-FNA, Résumé, 1 p. Simpósio do INCT-FNA. 5, Niteroi, Brésil, 3 Décembre 2025/5 Décembre 2025.https://indico.global/event/15425/; http://agritrop.cirad.fr/616759/7/616759.pdf |
| Availability: |
http://agritrop.cirad.fr/616759/; http://agritrop.cirad.fr/616759/7/616759.pdf; https://indico.global/event/15425/ |
| Rights: |
Cirad license ; info:eu-repo/semantics/openAccess ; https://agritrop.cirad.fr/mention_legale.html |
| Accession Number: |
edsbas.6DF1114C |
| Database: |
BASE |