Elsevier

Computational Biology and Chemistry

Volume 77, December 2018, Pages 413-429
Computational Biology and Chemistry

Transcriptome profilling analysis characterized the gene expression patterns responded to combined drought and heat stresses in soybean

https://doi.org/10.1016/j.compbiolchem.2018.09.012Get rights and content

Highlights

  • Combining dynamic changing SOD, MDA, soluble sugar and proline contents and the degree of leaf damage under stress, samples of 8 h and 24 h after heat, drought and combined stress treatments were selected for RNA-seq.

  • The RNA sequencing analysis demonstrated that many genes involved in the defense response, photosynthesis, metabolic process, etc. are differentially expressed in response to drought and heat. However, 1468 and 1220 upregulated and 1146 and 686 downregulated genes were confirmed as overlapping differentially expressed genes at 8 h and 24 h after treatment, and these genes are mainly involved in transport, binding and defense responses.

  • Comparison of single and combined stress suggests the combined stress did not result in a simple additive response, and that there may be a synergistic response to the combination of drought and heat in soybean.

  • TFs in the single and combination stress were identified from DEGs, which classified into 9 clusters according to expression levels of six treatment and one control groups, revealed dynamic changing TF expression profiles and molecular mechanisms in response to single and combination stress.

Abstract

Heat and drought are the two major abiotic stress limiting soybean growth and output worldwide. Knowledge of the molecular mechanisms underlying the responses to heat, drought, and combined stress is essential for soybean molecular breeding. In this study, RNA-sequencing was used to determine the transcriptional responses of soybean to heat, drought and combined stress. RNA-sequencing analysis demonstrated that many genes involved in the defense response, photosynthesis, metabolic process, etc. are differentially expressed in response to drought and heat. However, 1468 and 1220 up-regulated and 1146 and 686 down-regulated genes were confirmed as overlapping differentially expressed genes at 8 h and 24 h after treatment, and these genes are mainly involved in transport, binding and defense response. Furthermore, we compared the heat, drought and the combined stress-responsive genes and identified potential new targets for enhancing stress tolerance of soybean. Comparison of single and combined stress suggests the combined stress did not result in a simple additive response, and that there may be a synergistic response to the combination of drought and heat in soybean.

Section snippets

Plant materials and stress treatment

The drought-resistant soybean cultivar ‘Heinong44′ was grown in pots with a dimension of 13 × 10 × 10 cm (top diameter × bottom diameter × height), each filled with 1 kg sand. Seeds of ‘Heinong44′ were surface-sterilized in 1% sodium hypochlorite for 10 min, rinsed in distilled water three times, and then sown and grown in a growth chamber at 25°/20 °C (day/night), 14 h/10 h (light/dark), and 60%-80% humidity. Before the V1 stage of development, the seedling was irrigated with 100 mL distilled

Physiological analyses of soybean under drought and heat stress

We studied the physiological response of soybean under heat, drought and combined stress from 0 to 32 h at the V3 stage of development. The SOD activity initially showed a decreasing trend and then increased over time under the heat (H) and combined heat and drought (DH) treatments, and the SOD activity at 8 h was the lowest under both treatment conditions. However, the SOD activity under the drought (D) treatment initially increased and then decreased as the stress time increased, and the

Discussion

Extreme temperature and drought are two major abiotic stresses that often result in significant losses of the yields of crops such as soybean (Tran and Mochida, 2010). Transcriptomic analysis of plant response to stresses is an effective method of discovering key resistance genes, processes and pathways for stress response. The effect of individual drought stress on soybean has been investigated previously by RNA-seq (Chen et al., 2016; Le et al., 2012), while to our knowledge, no report has

Conclusions

Our results showed that many genes are differentially expressed in response to drought and heat, but only a small number of these genes were identified as overlapping DEGs. These overlapping DEGs may play key roles in modulating physiological function in response to stress. Furthermore, comparison of individual and combined heat and drought stress suggests combined stress is not a simple additive mechanism but may involve a complicated gene regulatory network in response to the combination of

Acknowledgments

This work was supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (grant numbers 2014BAD11B01) and the Collaborative Innovation Program of Heilongjiang Soybean Industrial Technology R&D System.

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