Abstract
Arachis hypogaea abscisic acid transporter like-1 (AhATL1) modulates abscisic acid (ABA) sensitivity by specifically influencing the importing of ABA into cells, and is a key player in plant stress responses. However, there is limited information on ABA transporters in crops. In this study, we found that the level of AhATL1 expression and AhATL1 distribution increased more rapidly in the second drought (D2) compared with in the first drought (D1). Compared with the first recovery (R1), the AhATL1 expression level and ABA content remained at a higher level during the second recovery (R2). The heterologous overexpression of AhATL1 in Arabidopsis changed the expression pattern of certain memory genes and changed the post response gene type into the memory gene type. Regarding the proline and water content of Col (Arabidopsis thaliana L. Heynh., Col-0), atabcg22, and AhATL1-OX during drought training, the second drought (D2) was more severe than the first drought (D1), which was more conducive to maintaining the cell osmotic balance and resisting drought. In summary, drought stress memory resulted in a rapid increase in the AhATL1 expression and AhATL1 distribution level, and then raised the endogenous ABA content and changed the post response gene type into the memory gene type, which enhanced the drought resistance and recovery ability.
Highlights
Plants will experience the same environmental stress many times in the process of natural growth [1]
We further found that the rate of the abscisic acid (ABA) uptake by mutant cells was significantly lower than that of the wild type, indicating that Arabidopsis thaliana AtABCG40/AtPDR12 is involved in the process of the ABA transmembrane transport into cells [8]
Crops can respond to the same stress more quickly and effectively through morphological adaptation, physiological, and hormonal changes and transcriptional modification, for example, by improving the transport and distribution of ABA, an important stress hormone, we found that both the AhATL1 protein and ABA existed in the roots, stems, and leaves of peanut plants during the process of drought stress memory
Summary
Plants will experience the same environmental stress many times in the process of natural growth [1]. There are few studies on the memory regulation mechanism of plant response to drought stress, in particular, the distribution of related proteins leading to changes in plant hormone levels in this process. The stem was straighter, and the drought resistance was clearly improved [11] This treatment system can simulate the growth of the peanut memory under drought stress; the specific mechanism of the response to stress and memory regulation is not clear. This study will explore the changes in the AhATL1 protein and ABA levels in peanuts during the process of stress memory and provide a new perspective for the molecular mechanism of the peanut drought stress memory process
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