ISOPALM Project- Annual report 2012-2013. Characterization of mineral flux N-K for oil palm

Lamade Emmanuelle. 2014. ISOPALM Project- Annual report 2012-2013. Characterization of mineral flux N-K for oil palm. Montpellier : CIRAD-PERSYST, 107 p. N° de rapport : CIRAD-PERSYST n°2605

Résumé : The main objectives of ISOPALM project is to propose a series of observations on oil palm in situ in order to understand the allocation of N and K in all vegetative and reproductive organs and to compare several types of genetic plant materials especially towards K (K+/K-). This experiment is conducted on the trial ALCP10 in Aek Loba. This project aims to answer the research questions as "how the rachis mineral content is pertinent or not compared to leaflets", "why there is some variations within genetic materials (as K+ or K-)" and in fine to understand the general trend of N,P,K allocation in all organs. Activities beared on different years (2011,2012,2013/2014). A first annual report for ISOPALM project have been issued in 2012. Interesting results were already pointed out in relation with the research questions. Significant differences were found on N and K contents between heterotrophic tissues compared to autotrophic one with K preferentially located and stocked in trunks and petioles (also rachis). Progenies with different K leaflets contents presented related differences for functionnals traits (LA, SLW, Height, trunk diameter) and leaf metabolism (solubles sugars, starch).The new results for this year are the functional typology of the genetic materials (N+K+,N-K-) belonging to two contrasting adaptive strategies "the quick return invest" and the "slow return invest" involving minerals and carbon metabolism traits. The palm trees belonging to "quick return", are presenting high minerals contents, small trunk height and high photosynthesis and high metabolism turn-over. They have high minerals requirement and can adapt in difficult ecology.The other palm trees belonging to the "slow return" present low minerals content, high height, low photosynthesis and low metabolism turn-over. They have lower mineral requirement and can only develop in potential environment.Other results are concerning the K allocation in the system rachis-leaflets. Some progenies present a huge difference in K content between rachis and leaflets. This is related to the trend of sugars transportation from the leaflets to the rachis. A relation has been found between this K gradient from rachis to leaflets and the ratio glucose/starch contents in the leaflets. Specifically,in ALCP10, some accumulation of sucrose have been found in leaflets and trunks indicating a possible disfunctionning due to the roots conditions. Ganoderma infestation may be at the origin of the poor conditions of the root system.

Classification Agris : F60 - Physiologie et biochimie végétale
F04 - Fertilisation
F30 - Génétique et amélioration des plantes

Auteurs et affiliations

• Lamade Emmanuelle, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0002-4909-0997

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573158/)

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