Metabolism of carbohydrates during the development of seeds of the brazilian rubber tree [Hevea brasiliensis (Willd. Ex Adr. de Juss) Muell.-Arg.] |
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Authors: | Lisandro Tomas da Silva Bonome Suerlani Aparecida Ferreira Moreira Luiz Edson Mota de Oliveira and Anderson de Jesus Sotero |
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Institution: | (1) Departamento de Biologia, Universidade Federal de Lavras, Lavras, Minas Gerais State, Brazil;(2) Departamento de Fitopatologia, Universidade Federal de Lavras, Lavras, Minas Gerais State, Brazil |
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Abstract: | This work aimed at the assessment of the metabolism of carbohydrate during the development of the seeds of Brazilian rubber
trees. The enzymatic activity of the acid invertase, neutral invertase and sucrose synthase (SuSy) and the levels of total
soluble sugars (TSS), reducing sugars (RS) and sucrose were evaluated separately in each part of the fruit and seed—pericarp,
seed coat, embryo and endosperm—on different days after the pollination (DAP). Based on the results obtained in this study,
it is possible to conclude that in the beginning of the development of the rubber tree seeds, until 95 DAP, the endosperm
presents high concentration of RS and low concentration of sucrose. After this period, the endosperm of the seed initiates
starch accumulation and the concentration of RS decreases followed by the increase in the concentration of sucrose, presenting,
after 120 DAP, an inversion of concentration of these two sugars. In the embryo, the levels of TSS, RS and sucrose show significant
increase with the progress of the seed development. In the endosperm, the transition of the division phase and cell expansion
for the storage of reserve material seem to occur around 120 DAP and is to be controlled mainly by the enzymes acid invertase
and SuSy, while in the embryo, such transition seems to occur around 135 DAP and is to be controlled mainly by the enzymes
acid and neutral invertases. |
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