@article{fdi:010053042,
  title = {{R}ole of relative humidity, temperature, and water status in dormancy alleviation of sunflower seeds during dry after-ripening},
  author = {{B}azin, {J}. and {B}atlla, {D}. and {D}ussert, {S}t{\'e}phane and {E}l {M}aarouf {B}outeau, {H}. and {B}ailly, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he effect of various combinations of temperature and relative humidity on dormancy alleviation of sunflower seeds during dry after-ripening was investigated. {T}he rate of dormancy alleviation depended on both temperature and embryo moisture content ({MC}). {B}elow an embryo {MC} of 0.1 g {H}2{O} g(-1) dw, dormancy release was faster at 15 degrees {C} than at higher temperatures. {T}his suggests that dormancy release at low {MC} was associated with negative activation energy, supported by {A}rrhenius plots, and low {Q}(10) values. {A}t higher {MC}, the rate of dormancy alleviation increased with temperature, correlating well with the temperature dependence of biochemical processes. {T}hese findings suggests the involvement of two distinct cellular mechanisms in dormancy release; non-enzymatic below 0.1 g {H}2{O} g(-1) dw and associated with active metabolism above this value. {T}he effects of temperature on seed dormancy release above the threshold {MC} were analysed using a population-based thermal time approach and a model predicting the rate of dormancy alleviation is provided. {S}unflower embryo dormancy release was effective at temperatures above 8 degrees {C} (the base temperature for after-ripening, {T}b-{AR}, was 8.17 degrees {C}), and the higher the after-ripening temperature above this threshold value, the higher was the rate of dormancy loss. {T}hermodynamic analyses of water sorption isotherms revealed that dormancy release was associated with less bound water and increased molecular mobility within the embryonic axes but not the cotyledons. {I}t is proposed that the changes in water binding properties result from oxidative processes and can, in turn, allow metabolic activities.},
  keywords = {{A}fter-ripening ; physiological dormancy ; relative humidity ; seed ; sunflower ; temperature ; thermal time ; water status},
  booktitle = {},
  journal = {{J}ournal of {E}xperimental {B}otany},
  volume = {62},
  numero = {2},
  pages = {627--640},
  ISSN = {0022-0957},
  year = {2011},
  DOI = {10.1093/jxb/erq314},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053042},
}