Abstract
In plant factories, measurements of plant conditions are necessary at an early stage of growth to predict harvest times of high value-added crops. Moreover, harvest qualities depend largely on environmental stresses that elicit plant hormone responses. However, the complexities of plant hormone networks have not been characterized under nonstress conditions. In the present study, we determined temporal expression profiles of all genes and then focused on plant hormone pathways using RNA-Seq analyses of gene expression in tomato leaves every 2 h for 48 h. In these experiments, temporally expressed genes were found in the hormone synthesis pathways for salicylic acid, abscisic acid, ethylene, and jasmonic acid. The timing of CAB expression 1 (TOC1) and abscisic acid insensitive 1 (ABA1) and open stomata 1 (OST1) control gating stomata. In this study, compare with tomato and Arabidopsis thaliana, expression patterns of TOC1 have similarity. In contrast, expression patterns of tomato ABI1 and OST1 had expression peak at different time. These findings suggest that the regulation of gating stomata does not depend predominantly on TOC1 and significantly reflects the extracellular environment. The present data provide new insights into relationships between temporally expressed plant hormone-related genes and clock genes under normal sunlight conditions.
Highlights
Cultivation environments comprise various determinants of yield and quality in agriculture, and circadian rhythms can be considered a critical component
We analyzed hormone pathway-related genes in tomato plants grown in a sunlight-type plant factory and showed temporal expression of at least one gene for each of four important hormone pathways
Temporal expression patterns of these hormone pathway-related genes were abolished under LL conditions, these data indicate the presence of hormone pathways that are regulated by circadian rhythms independently of light and stress conditions
Summary
Cultivation environments comprise various determinants of yield and quality in agriculture, and circadian rhythms can be considered a critical component. Circadian rhythms reportedly form the basis of the biological phenomenon that affects growth and quality of plants. Complexities of the related biological phenomena have hampered the identification of specific determining factors, warranting analyses of chronological gene expression.
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