FOOD CHEM南京東大鈣參與鹽脅迫下作物酚類積累的GABA信號轉導
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期刊:Food Chemistry
主題:鈣參與鹽脅迫下作物酚類積累的GABA信號轉導(鈣信號)
標題:Ca2+ involved in GABA signal transduction for phenolics accumulation in germinated hulless barley under NaCl stress
影響因子:5.399
檢測指標:Ca2+流速
檢測部位:根尖細胞
Ca2+流實驗處理方法:
三日齡的大麥幼苗,60mM NaCl、60mM NaCl + 0.5mM GABA、60mM NaCl + 0.1mM 3-MP分別處理四天和六天
Ca2+流實驗測試液成份:
0.1mM KCl, 0.1mM CaCl2, 0.1mM MgCl2, 0.5mM NaCl, 0.3mM MES, 0.2mM Na2SO4,ph 6.0
通訊作者:南京農業大學楊潤強、馬燕
英文摘要
In this study, in order to investigate the role of Ca2+ in GABA signal transduction involved in phenolics accumulation in barley seedlings under NaCl stress, the seedlings were treated with exogenous GABA and its synthesis inhibitor, 3-mercaplopropionic acid (3-MP), as well as Ca2+ channel blockers La3+, Ca2+ chelator EGTA, and Ca2+ release channel inhibitor 2-aminoethoxydiphenyl borate (2-APB).
The results showed that GABA significantly enhanced phenolics, calcium and calmodulin content. It also induced Ca2+ influx in barley root tips cells, and altered the distribution of Ca2+, making calcium precipitates more uniform and intensive. While, 3-MP treatment led to opposite changes, which suggested that GABA was essential for calcium content increase. In addition, accumulation of phenolics was inhibited by LaCl3, EGTA and 2-APB treatments, and this inhibition could be alleviated partly by exogenous GABA.
Taken together, Ca2+ was involved in GABA signal transduction for phenolics accumulation in barley seedlings under NaCl stress.
中文摘要(谷歌機翻)
在本研究中,為了研究Ca2+在NaCl脅迫下大麥幼苗中酚類物質積累的GABA信號轉導中的作用,用外源GABA及其合成抑制劑3-巰基丙酸(3-MP)處理幼苗。以及Ca2+通道阻滯劑La3+,Ca2+螯合劑EGTA和Ca2+釋放通道抑制劑2-氨基乙氧基二苯基硼酸鹽(2-APB)。
結果表明,GABA顯著增強了酚類,鈣和鈣調蛋白的含量。它還誘導大麥根尖細胞內的Ca2+流入,并改變Ca2+的分布,使鈣沉淀更均勻和密集。然而,3-MP處理導致相反的變化,這表明GABA對鈣含量的增加至關重要。此外,LaCl3,EGTA和2-APB處理抑制了酚類物質的積累,這種抑制作用可以通過外源性GABA部分緩解。
總之,Ca2+參與了NaCl脅迫下大麥幼苗中酚類物質積累的GABA信號轉導。
結果表明,對照大麥幼苗根尖Ca2+外排,與對照相比,NaCl處理引起的Ca2+由外排向吸收轉變。GABA處理得到穩定的Ca2+吸收,其中處理6天的吸收明顯高于處理4天吸收。GAD抑制劑(3-MP)在不同處理時期產生了不同的趨勢,與單獨使用NaCl處理相比,第4天Ca2+的外排速率顯著增加,但第6天Ca2+流入量較弱。
注:CK表示大麥用蒸餾水噴灑; N表示60mM NaCl處理; NG表示60mM NaCl + 0.5mM GABA處理; NM表示60mM NaCl + 0.1mM 3-MP處理。