期刊
PLANT SCIENCE
卷 320, 期 -, 页码 -出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2022.111292
关键词
Abiotic stress; Citrus; Epigenetics; Photosynthetic performance; Water deficit
资金
- National Council for Scientific and Technological Development, an agency of the Ministry of Science, Technology, Innovation and Communications of Brazil [402526/2016-3]
- Coordination for the Improvement of Higher Education Personnel
This study investigates whether citrus plants have drought stress memory mechanisms and finds that genotype-dependent epigenetic memory plays a key role in restoring plants' ability to respond to water limitation.
Plants face recurrent drought events, and previous stresses can influence their responses to subsequent stress episodes. Studies on drought stress memory are recent in citriculture, although they show promise as a tool for crop improvement. Here, we investigated whether stress memory mechanisms can be detected in citrus plants grafted with buds from plants subjected to recurrent water deficit. Three rootstock varieties, namely 'Rangpur Santa Cruz' lime, 'Sunki Maravilha' mandarin and 'Sunki Tropical' mandarin, in combination with 'Valencia' orange, were either maintained under full irrigation or subjected to one, two, or three water deficit cycles. Buds from 'Valencia' orange were grafted onto 'Swingle' citrumelo rootstocks and were evaluated. This combination displayed improved physiological and biochemical performance under water limitation, especially 'Valencia' buds grafted onto 'Sunki Maravilha', with better photosynthetic performance under water deficit. These findings indicate that genotype-dependent epigenetic memory is a key factor in restoring citrus plants' capacity to rely on previous stress experiences to restore better photosynthetic and physiological responses when undergoing new water deficit events. Therefore, epigenetic marks can be stored and transmitted to new citrus plants and are a promising alternative to enable increased water deficit tolerance when plants are then challenged by drought-prone environments.
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