Seasonal fluctuation of organic and inorganic components in xylem sap of Populus nigra
Seasonal fluctuation of organic and inorganic components in xylem sap of Populus nigra
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DOI：
10.3117/plantroot.5.56
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发表时间：
2011-01-01
期刊：
影响因子：
0.6
通讯作者：
Satoh, Shinobu
中科院分区：
文献类型：
--
作者：
Furukawa, Jun;Abe, Yuta;Satoh, Shinobu
落叶乔木枝的生长发育具有年周期性，但根的生长发育周期性研究较少。为了阐明根系功能的季节性变化，对2年的黑杨枝条木质部汁液进行了分析。钙、钾、葡萄糖和蛋白质等各种木质部汁液成分表现出季节性波动，从冬季到春季达到峰值。脱落酸（阿坝）是木质部汁液中含量最高的激素，在四季中含量最高，在晚秋至春季有两个高峰。我们推测，在冬季低温促进金属加载到木质部汁液和蛋白质和糖在根中的合成作为一种适应冬季环境，并准备春芽爆裂。
Deciduous trees show annual periodicity in shoot growth and development, but such periodicity is not well investigated in roots. To clarify the seasonal fluctuation in root functions, xylem sap from Populus nigra branches was analyzed for 2 years. Various xylem sap components including calcium, potassium, glucose, and proteins showed seasonal fluctuations with peaks from winter to spring. Abscisic acid (ABA) was the most abundant hormone in the xylem sap throughout all seasons and showed two peaks from late autumn to spring. We hypothesize that low temperature in winter promotes metal loading into the xylem sap and the synthesis of proteins and sugars in roots as an adaptation to the winter environment and to prepare for spring bud burst.