Background The majority of stress-sensitive genes responds to cold and highlight in the same direction, if plants face the stresses for the first time. As shown recently for a small selection of genes of the core environmental stress response cluster, pre-treatment of Arabidopsis thaliana with a 24 h long 4 °C cold stimulus modifies cold regulation of gene expression for up to a week at 20 °C, although the primary cold effects are reverted within the first 24 h. Such memory based regulation is called priming. Here, we show the effect of 24 h cold priming on cold regulation of gene expression on a transcriptome-wide scale and test if and how cold priming effects light regulation of gene expression.
Results 304 genes were differently regulated between cold-primed and non-primed plants after a second 24 h long 4 °C cold treatment. After triggering the plants with a heat-filtered highlight stimulus (800 µmol quanta m -2 s -1 ), 1011 genes showed priming dependent regulation. Only 32 of the priming-sensitive genes responded similarly to cold and light triggering. The majority of the priming-sensitive genes were regulated in a stressor-specific manner. 29 genes were even inversely regulated by the two triggering stimuli. Cold priming preferentially supported expression of genes involved in the defense against plant pathogens upon cold triggering. The regulation took place on the cost of the expression of genes involved in growth regulation and transport. On the contrary, cold priming resulted in stronger expression of genes regulating metabolism and development and weaker expression of defense genes in response to highlight triggering. qPCR in several independently cultivated and treated samples confirmed the trends observed by RNA-Sequencing.
Conclusion The 24 h long priming cold stimulus activates a several day lasting stress memory that controls cold and light regulation of gene expression and adjusts growth and defense regulation in a stressor-specific manner.

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Received 10 Jan, 2020
On 09 Jan, 2020
Invitations sent on 08 Jan, 2020
On 31 Dec, 2019
On 11 Dec, 2019
On 10 Dec, 2019
On 10 Dec, 2019
On 09 Jun, 2020
On 04 Jun, 2020
On 03 Jun, 2020
On 03 Jun, 2020
On 02 Jun, 2020
On 24 May, 2020
On 23 May, 2020
On 23 May, 2020
On 20 May, 2020
Received 14 May, 2020
Invitations sent on 08 May, 2020
On 08 May, 2020
On 07 May, 2020
On 06 May, 2020
On 30 Dec, 2019
Received 04 May, 2020
On 04 May, 2020
On 06 Apr, 2020
On 30 Mar, 2020
Received 30 Mar, 2020
Invitations sent on 27 Mar, 2020
On 25 Mar, 2020
On 24 Mar, 2020
On 24 Mar, 2020
Posted 06 Jan, 2020
On 12 Mar, 2020
Received 10 Mar, 2020
On 23 Feb, 2020
Received 10 Jan, 2020
On 09 Jan, 2020
Invitations sent on 08 Jan, 2020
On 31 Dec, 2019
On 11 Dec, 2019
On 10 Dec, 2019
On 10 Dec, 2019
Background The majority of stress-sensitive genes responds to cold and highlight in the same direction, if plants face the stresses for the first time. As shown recently for a small selection of genes of the core environmental stress response cluster, pre-treatment of Arabidopsis thaliana with a 24 h long 4 °C cold stimulus modifies cold regulation of gene expression for up to a week at 20 °C, although the primary cold effects are reverted within the first 24 h. Such memory based regulation is called priming. Here, we show the effect of 24 h cold priming on cold regulation of gene expression on a transcriptome-wide scale and test if and how cold priming effects light regulation of gene expression.
Results 304 genes were differently regulated between cold-primed and non-primed plants after a second 24 h long 4 °C cold treatment. After triggering the plants with a heat-filtered highlight stimulus (800 µmol quanta m -2 s -1 ), 1011 genes showed priming dependent regulation. Only 32 of the priming-sensitive genes responded similarly to cold and light triggering. The majority of the priming-sensitive genes were regulated in a stressor-specific manner. 29 genes were even inversely regulated by the two triggering stimuli. Cold priming preferentially supported expression of genes involved in the defense against plant pathogens upon cold triggering. The regulation took place on the cost of the expression of genes involved in growth regulation and transport. On the contrary, cold priming resulted in stronger expression of genes regulating metabolism and development and weaker expression of defense genes in response to highlight triggering. qPCR in several independently cultivated and treated samples confirmed the trends observed by RNA-Sequencing.
Conclusion The 24 h long priming cold stimulus activates a several day lasting stress memory that controls cold and light regulation of gene expression and adjusts growth and defense regulation in a stressor-specific manner.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10
This is a list of supplementary files associated with this preprint. Click to download.
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