02793naa a2200229 a 450000100080000000500110000800800410001910000170006024501110007726000090018852020870019765300280228465300150231265300120232765300090233970000150234870000170236370000170238070000180239770000140241577301340242911294362020-03-12       2004    bl uuuu     u00u1 u    #d1 aPUTTI, G. L.  aStudy of the growth capacity of the strawberry plant by microcalorimetric approach.h[electronic resource]  c2004  aImprovement and rational management of the strawberry plant production require knowledge of their physiological state, during the production stages and particularly of their growth capacity. How environmental factors influence the evolution of the physiological state of the plants is not satisfactory documented; moreover the relevance of methods of characterization of this state, less heavy than the classic ones is yet to be tested. A candidate method is microcalorimetric measurement. The physiological activity of plant tissues can be assessed through the respiration intensity (for example the emitted CO2 flux - RCO2) and the flux (Q) of the emitted metabolic heat. Combining these two parameters can characterize the growth efficiency (part of the energy provided by respiration dedicated to growth). Microcalorimetry permits the quick measurement of these fluxes, on small quantities of material. However a methodological point is yet to be studied; the influence on the recorded parameters of the temperature conditions during the hours or days preceding measurement (acclimatization). We undertook to validate the approach of the dynamics of the plant state by the microcalorimetric method an trayplants cv Gariguette (comparing natural conditions and short cold treatments - 1 month under 2 ºC). The analyzed organs were mainly the buds, but data were collected on petioles and roots as well. The microcalorimetric data (recorded without acclimatization or after 48 and 72 hours 20 ºC acclimatization) were compared to the data given by the classical approaches of the plant state; biological ?petioles? growth test and refractometric index measurement on roots. The 2002 data showed that the microcalorimetric values depended much on the temperatures that the plant experienced during the few days before measurement; accordingly, standard conditioning of the plants must come before measurement. The data also showed that the Q and RCO2 values could be relevant for characterizing the dormancy dynamics. A replication of the experiment should confirm these results.  aatividade respiratória  aDormência  amorango  amuda1 aRAGEAU, R.1 aBONHOMME, M.1 aLEITE, G. B.1 aSABBADINI, C.1 aPETEL, G.  tIn: INTERNATIONAL SYMPOSIUM ON PLANT DORMANCY , 3., 2004, Wageningen. Abstracts... Wageningen: Wageningen University, 2004. p. 62