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Effect of chronic β-radiation on long-distance electrical signals in wheat and their role in adaptation to heat stress
Environmental and Experimental Botany ( IF 5.7 ) Pub Date : 2021-01-10 , DOI: 10.1016/j.envexpbot.2021.104378
Marina A. Grinberg , Sergey V. Gudkov , Irina V. Balalaeva , Ekaterina Gromova , Yuliya Sinitsyna , Vladimir Sukhov , Vladimir Vodeneev

Plants are unavoidably exposed to ionizing radiation (IR) from natural and anthropogenic sources. Along with the chronic irradiation, plants are influenced by other environmental stress factors, to which they must adapt. We suppose that high background radiation modifies plant response to environmental stressors by influencing the stress signaling which are the crucial players in induction and orchestrating the formation of plant adaptation. Chronic β-radiation (31.3 μGy/h) does not cause pronounced oxidative stress and significant changes in morphometric parameters of wheat seedlings (Triticum aestivum L.). At the same time, chronic IR exposure causes slight activation of transpiration and assimilation, and activates H+-ATPase-dependent transmembrane transport. In irradiated plants, there is an increase in the amplitude, velocity and propagation distance of electrical signals induced by a local stimulus. Accordingly, in irradiated plants, photosynthesis and transpiration responses caused by an electrical signal are significantly enhanced. The opposite effect of the electric signal on heat stress resistance was found: after the signal passing, the resistance of control plants increases, but it decreases for irradiated plants. It is assumed that the inversion of the effect is resulted from the enhanced responses of transpiration due to the electrical signals amplification.



中文翻译:

慢性β辐射对小麦长途电信号的影响及其对热胁迫的适应作用

植物不可避免地暴露于自然和人为来源的电离辐射(IR)中。除长期照射外,植物还必须适应其他环境胁迫因素。我们认为,高背景辐射会通过影响胁迫信号来改变植物对环境胁迫的响应,胁迫信号是诱导和协调植物适应形成的关键因素。长期的β辐射(31.3μGy/ h)不会引起明显的氧化应激,也不会引起小麦幼苗(Triticum aestivum L.)形态参数的显着变化。同时,长期的红外线暴露会导致蒸腾作用和同化作用轻微激活,并激活H +-ATP酶依赖性跨膜转运。在受辐照的植物中,由局部刺激引起的电信号的幅度,速度和传播距离增加。因此,在被辐照的植物中,由电信号引起的光合作用和蒸腾响应显着增强。发现电信号对热胁迫抗性具有相反的影响:信号传递后,对照植物的电阻增加,但辐照植物则降低。假定效应的反转是由于电信号放大引起的蒸腾响应增强。

更新日期:2021-01-14
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