The team of fruit tree adversity biology of Northwestern University of Agriculture, Forgrust science and technology has made new progress in the new mechanism of sugar transport protein co-regulation of fructose accumulation

Original title: New progress has been made by the fruit tree adversity biology team of Northwest Agricultural and Forglin Science and Technology University in the new mechanism of sugar transport protein co-regulation of fructose accumulation
Recently, the fruit tree adversity
biology
team of Northwestern Agricultural and Forgro-Science and Technology University's School of Horticulture The latest research, entitled "MdERDL6-mediated glucose efflux to the cytosol promotes sugar product in the production of the vacuole through upregulating TSTs in apple and tomato", was published online. Zhu Ling, a Ph.D. student at the School of Horticulture, became the first author of the paper, and Professors Li Mingjun and Ma Fengwang of the Fruit Tree Adversity Biology Team and Professor Changjiang Scholars at the School of Horticulture,
Australia
Yong-Ling Ruan of Newcastle University, co-author of the paper.
The study revealed that the highly expressed glucose excrete
protein
MdERDL6 in apple fruits can cause Glc excrete in the bubble, increase the instantaneous concentration of Glc in the cytonucleus, stimulate the expression of in-sugar protein TST, and thus promote the accumulation of Glc, Fru and Suc in the bubble of the new mechanism. The study explains why the sugar content of glucose and fructose in fruits can reach 10% of fresh weight, while organs such as leaves contain less than 1%.
is the core of fruit quality, which not only directly affects the flavor quality such as the sweetness of fruit, but also the synthetic presupposor of other quality substances of fruit. The large accumulation of soluble sugar in fruit bubble is mainly regulated by sugar transport protein, and it is very important to study the function of liquid bubble sugar transport protein in fruit sugar accumulation. Early study by the team found that the apple liquid bubble membrane sugar excrete protein ERDL6 family and multiple members of the internal protein TST family were highly expressed in the fruit, and consistent with the accumulation pattern of fructose and sucrose in the fruit. In order to find out the role of ERDL6 in fructose accumulation and its relationship with TST, the authors study the function of MdERDL6-1, which is highly expressed in apple fruit, and its mechanism of regulating sugar content.
MdERDL6-1 affects the ability of sugar to accumulate in the bubble and the amount of fructose in the bubble by regulating the expression of TST12
The results show that in apple fruit, the sugar in the crust is unloaded into thin-walled cells through a series of processes, some of which are used for cell energy consumption and carbon skeleton construction, and Part of the liquid bubble film sugar transport protein MdTST transported to the bubble for storage, and MdERDL6 mediated Glc can be used as a signal to increase the expression of MdTST1 and MdTST2, so that the sugar in the bubble accumulated to a higher concentration, and this regulatory mode is also applicable in tomato fruit. This study reveals for the first time that two different families of sugar transport proteins on the liquid bubble film can co-regulate the accumulation of sugar, which provides a new way of thinking for improving fruit quality through molecular breeding in the future.
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