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Photoperiod stress primes the plant pathogen response. 5-weeks-old short-day grown plants were exposed to an extended light period of 32 h followed by a normal short-day night. An overview of the experimental setup can be found in Figure 7A and arrowhead indicates sampling time point. (A) Salicylic acid (SA) and (B) camalexin concentration after photoperiod stress treatment. Error bars represent SE (n = 8).(C-D) Bacterial growth in Arabidopsis plants pretreated with a 32 h (C) or 8 h (D) prolonged light period. Bacterial infection was done during the day following the extended light period and bacteria were extracted from leaves 3 days later. Error bars represent SE (n = 8). Letters indicate different statistical groups (p ≤ 0.05).
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Plants are exposed to regular diurnal rhythms of light and dark. Changes in the photoperiod by the prolongation of the light period cause photoperiod stress in short day-adapted Arabidopsis thaliana . Here we report on the transcriptional response to photoperiod stress of wild-type A. thaliana and photoperiod stress-sensitive cytokinin signalling a...
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Citations
... Recent studies (Nitschke et al., 2016(Nitschke et al., , 2017 revealed that a sudden prolongation of the photoperiod causes a new form of abiotic stress, namely photoperiod stress, resulting in a nightly ROS accumulation in the apoplast and a stress response resembling pathogen infection (Abuelsoud et al., 2020;Cortleven et al., 2021). Photoperiod stress signals might have an adaptive value, for example by acting as a priming agent, which improves the plants' performance to future stresses. ...
The photoperiod, which is the length of the light period in the diurnal cycle of 24 h, is an important environmental signal. Plants have evolved sensitive mechanisms to measure the length of the photoperiod. Photoperiod sensing enables plants to synchronize developmental processes, such as the onset of flowering, with a specific time of the year, and enables them to alleviate the impact of environmental stresses occurring at the same time every year. During the last years, the importance of the photoperiod for plant responses to abiotic and biotic stresses has received increasing attention. In this review, we summarize the current knowledge on the signaling pathways involved in the photoperiod-dependent regulation of responses to abiotic (freezing, drought, osmotic stress) and biotic stresses. A central role of GIGANTEA (GI), which is a key player in the regulation of photoperiod-dependent flowering, in stress responses is highlighted. Special attention is paid to the role of the photoperiod in regulating the redox state of plants. Furthermore, an update on photoperiod stress, which is caused by sudden alterations in the photoperiod, is given. Finally, we will review and discuss the possible use of photoperiod-induced stress as a sustainable resource to enhance plant resistance to biotic stress in horticulture.
