Hormonal treatment of the bark of rubber trees (Hevea brasiliensis) increases latex yield through latex dilution in relation with the differential expression of two aquaporin genes

Journal of Plant Physiology
Kessarin TungngoenJarunya Narangajavana

Abstract

Natural rubber is synthesized in laticifers in the inner liber of the rubber tree (Hevea brasiliensis). Upon bark tapping, the latex is expelled due to liber turgor pressure. The 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. Auxins 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. We recently reported that there are three aquaporin genes, HbPIP2;1, HbTIP1;1 and HbPIP1;1, that are regulated differentially after ethylene bark treatment. HbPIP2;1 was up-regulated in both the laticifers and the inner liber tissues, whereas HbTIP1;1 was up-regulated in the latex cells, but very markedly down-regulated in the inner liber tissues. Conversely, HbPIP1;1 was down-regulated in both tissues. In the present study, HbPIP2;1 and HbTIP1;1 showed a similar expression in response to auxin, ABA and SA, as seen in ethylene stimulation, while HbPIP1;1 was slightly regulated by auxin, but neither by ABA nor SA. The analysis of the HbPIP1;1 promoter region indicated the p...Continue Reading

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Citations

Jan 18, 2013·BMC Genomics·Cuifang DuanPascal Montoro
Aug 11, 2015·Plant Science : an International Journal of Experimental Plant Biology·Francisco J Molina-HidalgoRosario Blanco-Portales
Jul 16, 2014·Plant Science : an International Journal of Experimental Plant Biology·Yuichi AokiToru Nakayama
Nov 6, 2018·Current Protein & Peptide Science·João P Bezerra-NetoAna M Benko-Iseppon
Mar 28, 2019·Bioscience, Biotechnology, and Biochemistry·Qichao WangXi Huang

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