scholarly journals A Rice Antisense SPK Transformant that Lacks the Accumulation of Seed Storage Substances Shows no Correlation Between Sucrose Concentration in Phloem Sap and Demand for Carbon Sources in the Sink Organs

2004 ◽  
Vol 45 (8) ◽  
pp. 1105-1109 ◽  
Author(s):  
Hiroaki Shimada ◽  
Hiroaki Koishihara ◽  
Yayoi Saito ◽  
Yuki Arashima ◽  
Tomoyuki Furukawa ◽  
...  
Keyword(s):  
Sucrose Concentration ◽  
Carbon Sources ◽  
Seed Storage ◽  
Phloem Sap

Contribution of the carbon sources involved in latex regeneration in rubber trees (Hevea brasiliensis): an in situ 13CO2 labelling experiment

2020 ◽  
Author(s):  
Dorine Desalme ◽  
Ornuma Duangngam ◽  
Philippe Thaler ◽  
Poonpipope Kasemsap ◽  
Jate Sathornkich ◽  
...  
Keyword(s):  
Hevea Brasiliensis ◽  
Rubber Tree ◽  
Carbon Sources ◽  
Pulse Labelling ◽  
Phloem Sap ◽  
Labelling Experiment ◽  
Latex Regeneration ◽  
Source Sink ◽  
Latex Production

<p>Rubber trees (<em>Hevea brasiliensis</em>) are the main source of natural rubber, extracted from latex, which exudes from the trunk after tapping. Tapped trees require large amounts of carbon (C) to regenerate the latex after its collection. Knowing the contribution of C sources involved in latex biosynthesis will help understand how rubber trees face this additional C demand. Whole crown<sup> 13</sup>CO<sub>2 </sub>pulse labelling was performed on 4-year-old rubber trees in June when latex production was low and in October, when it was high. <sup>13</sup>C contents were quantified in the foliage, phloem sap, wood and latex. In both labelling periods, <sup>13</sup>C was recovered in latex just after labelling, indicating that part of the carbohydrates was directly allocated to latex. However, significant <sup>13</sup>C amounts were still recovered in latex after 100 days and the peak was reached significantly later than in phloem sap, demonstrating the contribution of a reserve pool as a source of latex C. The contribution of new photosynthates to latex regeneration was faster and higher when latex metabolism was well established, in October than in June. An improved understanding of C dynamics and source-sink relationship in rubber tree is crucial to adapt tapping system practices and ensure sustainable latex production.</p>

In situ 13CO2 labelling of rubber trees reveals a seasonal shift in the contribution of the carbon sources involved in latex regeneration

2020 ◽  
Vol 71 (6) ◽  
pp. 2028-2039
Author(s):  
Ornuma Duangngam ◽  
Dorine Desalme ◽  
Philippe Thaler ◽  
Poonpipope Kasemsap ◽  
Jate Sathornkich ◽  
...  
Keyword(s):  
Rubber Tree ◽  
Carbon Sources ◽  
Pulse Labelling ◽  
Phloem Sap ◽  
Latex Regeneration ◽  
Source Sink ◽  
13Co2 Labelling ◽  
Latex Biosynthesis ◽  
Latex Production

Abstract Rubber trees (Hevea brasiliensis) are the main source of natural rubber, extracted from latex, which exudes from the trunk after tapping. Tapped trees require large amounts of carbon (C) to regenerate the latex after its collection. Knowing the contribution of C sources involved in latex biosynthesis will help in understanding how rubber trees face this additional C demand. Whole crown 13CO2 pulse labelling was performed on 4-year-old rubber trees in June, when latex production was low, and in October, when it was high. 13C content was quantified in the foliage, phloem sap, wood, and latex. In both labelling periods, 13C was recovered in latex just after labelling, indicating that part of the carbohydrate was directly allocated to latex. However, significant amounts of 13C were still recovered in latex after 100 d and the peak was reached significantly later than in phloem sap, demonstrating the contribution of a reserve pool as a source of latex C. The contribution of new photosynthates to latex regeneration was faster and higher when latex metabolism was well established, in October, than in June. An improved understanding of C dynamics and the source–sink relationship in rubber tree is crucial to adapt tapping system practices and ensure sustainable latex production.

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