根瘤菌
生物
淀粉
生物化学
碳水化合物代谢
淀粉体
碳水化合物
蔗糖
新陈代谢
糖
蔗糖合成酶
共转运蛋白
植物
运输机
基因
砧木
转化酶
质体
叶绿体
作者
Michaela Griesser,N.C. Lawo,Sara Crespo-Martínez,Katharina Schoedl‐Hummel,Krzysztof Wieczorek,Mirosława Górecka,Falk Liebner,Thomas Zweckmair,Nancy Stralis Pavese,David P. Kreil,Astrid Forneck
出处
期刊:Plant Science
[Elsevier]
日期:2015-05-01
卷期号:234: 38-49
被引量:30
标识
DOI:10.1016/j.plantsci.2015.02.002
摘要
Gall forming phylloxera may compete for nutrients with meristematic tissues and develop heterotrophic structures that act as carbon sinks. In this work, we studied the underlying starch metabolism, sink-source translocation of soluble sugars towards and within root galls. We demonstrated that nodosities store carbohydrates by starch accumulation and monitored the expression of genes involved in the starch metabolic. Thereby we proved that the nodosity is symplastically connected to the source tissues through its development and that the starch metabolism is significantly affected to synthesize and degrade starch within the gall. Genes required for starch biosynthesis and degradation are up-regulated. Among the carbohydrate transporters the expression of a glucose-6-phosphate translocater, one sucrose transporter and two SWEET proteins were increases, whereas hexose transporters, tonoplast monosaccharide transporter and Erd6-like sugar transporters were decreased. We found general evidence for plant response to osmotic stress in the nodosity as previously suggested for gall induction processes. We conclude that nodosities are heterogenous plant organs that accumulate starch to serve as temporary storage structure that is gradually withdrawn by phylloxera. Phylloxera transcriptionally reprograms gall tissues beyond primary metabolism and included downstream secondary processes, including response to osmotic stress.
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