@article{fdi:010053172,
  title = {{H}ormonal treatment of the bark of rubber trees ({H}evea brasiliensis) increases latex yield through latex dilution in relation with the differential expression of two aquaporin genes},
  author = {{T}ungngoen, {K}. and {V}iboonjun, {U}. and {K}ongsawadworakul, {P}. and {K}atsuhara, {M}. and {J}ulien, {J}. {L}. and {S}akr, {S}. and {C}hrestin, {H}erv{\'e} and {N}arangajavana, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}atural rubber is synthesized in laticifers in the inner liber of the rubber tree ({H}evea brasiliensis). {U}pon bark tapping, the latex is expelled due to fiber turgor pressure. {T}he mature laticifers are devoid of plasmodesmata; therefore a corresponding decrease-in the total latex solid content is likely to occur due to water influx inside the laticifers. {A}uxins and ethylene used as efficient yield stimulants in mature untapped rubber trees, but, bark treatments with abscisic acid ({ABA}) and salicylic acid ({SA}) could also induce a transient increase latex yield. {W}e recently reported that there are three aquaporin genes, {H}b{PIP}2;1, {H}b{T}1{P}1;1 and {H}b{PIP}1;1, that are regulated differentially after ethylene bark treatment. {H}b{PIP}2:1 was up-regulated in both the laticifers and the inner liber tissues, whereas {H}b{T}1{P}1:1 was up-regulated in the latex cells, but very markedly down-regulated in the inner liber tissues. {C}onversely, {H}b{PIP}1:1 was down-regulated in both tissues. {I}n the present study, {H}b{PIP}2;1 and {H}b{T}1{P}1:1 showed a similar expression in response to auxin, {ABA} and {SA}, as seen in ethylene stimulation, while {H}b{PIP}1;1 was slightly regulated by auxin, but neither by {ABA} nor {SA}. {T}he analysis of the {H}b{PIP}1:1 promoter region indicated the presence of only ethylene and auxin responsive elements. {I}n addition, the poor efficiency of this {H}b{PIP}1;1 in increasing plasmalemma water conductance was confirmed in {X}enopus oocytes. {T}hus, an increase in latex yield in response to all of these hormones was proposed to be the major function of aquaporins, {H}b{PIP}2:1 and {H}b{TIP}1;1. {T}his study emphasized that the circulation of water between the laticifers and their surrounding tissues that result in latex dilution, as well as the probable maintenance of the liber tissues turgor pressure, favor the prolongation of latex flow.},
  keywords = {{A}quaporin ; {H}evea brasiliensis ; {H}ormonal treatment ; {L}atex yield ; {R}ubber tree},
  booktitle = {},
  journal = {{J}ournal of {P}lant {P}hysiology},
  volume = {168},
  numero = {3},
  pages = {253--262},
  ISSN = {0176-1617},
  year = {2011},
  DOI = {10.1016/j.jplph.2010.06.009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053172},
}