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小木虫»小木虫论坛»成果分享FOOD CHEM:南京农大丨钙参与盐胁迫下作物酚类积累的GABA信号转导»正文
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FOOD CHEM:南京农大丨钙参与盐胁迫下作物酚类积累的GABA信号转导

 楼主| xuyue_2017 发表于 2019-8-8 17:23  
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期刊:Food Chemistry
主题:钙参与盐胁迫下作物酚类积累的GABA信号转导(钙信号)
标题:Ca2+ involved in GABA signal transduction for phenolics accumulation in germinated hulless barley under NaCl stress
影响因子:5.399
检测指标:Ca2+流速
检测部位:根尖细胞
Ca2+流实验处理方法:
三日龄的大麦幼苗,60mM NaCl、60mM NaCl + 0.5mM GABA、60mM NaCl + 0.1mM 3-MP分别处理四天和六天
Ca2+流实验测试液成份:
0.1mM KCl, 0.1mM CaCl2, 0.1mM MgCl2, 0.5mM NaCl, 0.3mM MES, 0.2mM Na2SO4,ph 6.0
通讯作者:南京农业大学杨润强、马燕

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(谷歌机翻)
在本研究中,为了研究Ca2+在NaCl胁迫下大麦幼苗中酚类物质积累的GABA信号转导中的作用,用外源GABA及其合成抑制剂3-巯基丙酸(3-MP)处理幼苗。以及Ca2+通道阻滞剂La3+,Ca2+螯合剂EGTA和Ca2+释放通道抑制剂2-氨基乙氧基二苯基硼酸盐(2-APB)。

结果表明,GABA显着增强了酚类,钙和钙调蛋白的含量。它还诱导大麦根尖细胞内的Ca2+流入,并改变Ca2+的分布,使钙沉淀更均匀和密集。然而,3-MP处理导致相反的变化,这表明GABA对钙含量的增加至关重要。此外,LaCl3,EGTA和2-APB处理抑制了酚类物质的积累,这种抑制作用可以通过外源性GABA部分缓解。

总之,Ca2+参与了NaCl胁迫下大麦幼苗中酚类物质积累的GABA信号转导。
​结果表明,对照大麦幼苗根尖Ca2+外排,与对照相比,NaCl处理引起的Ca2+由外排向吸收转变。GABA处理得到稳定的Ca2+吸收,其中处理6天的吸收明显高于处理4天吸收。GAD抑制剂(3-MP)在不同处理时期产生了不同的趋势,与单独使用NaCl处理相比,第4天Ca2+的外排速率显着增加,但第6天Ca2+流入量较弱。
注:CK表示大麦用蒸馏水喷洒; N表示60mM NaCl处理; NG表示60mM NaCl + 0.5mM GABA处理; NM表示60mM NaCl + 0.1mM 3-MP处理。


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FOOD CHEM:南京农大丨钙参与盐胁迫下作物酚类积累的GABA信号转导
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