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Comparative Cytological and Gene Expression Analysis Reveals That a Common Wild Rice Inbred Line Showed Stronger

Zijuan Huang^1,2,3, Peishan Huang^1,2,3, Shihui Chen^1,2,3

¹State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou 510642, China.

International Journal of Molecular Sciences

|July 13, 2024

Summary

Huaye3, a wild rice line, demonstrates superior drought tolerance compared to Dawennuo. This finding supports its use in selecting drought-resistant rice germplasm.

Keywords:

Oryza rufipogon Griff drought stress genome re-sequencing seed germination

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Published on: January 25, 2022

Area of Science:

Plant Science
Genetics
Agronomy

Background:

Common wild rice (Oryza rufipogon) is a valuable genetic resource.
A stable wild rice inbred line, Huaye3, was previously identified but its drought tolerance was unknown.

Purpose of the Study:

To evaluate the drought tolerance of the Huaye3 wild rice line.
To compare germination and seedling growth of Huaye3 with Dawennuo under polyethylene glycol (PEG6000)-induced drought stress.

Main Methods:

Germination and seedling growth assays under five PEG6000 concentrations (0-20%).
Cytological observations of root tips.
Whole-genome re-sequencing analysis.

Main Results:

Huaye3 exhibited significantly higher germination rates (52.50%) than Dawennuo (25.83%) under 20% PEG6000.
Huaye3 showed fewer cellular abnormalities in root tips under drought stress.
Re-sequencing identified 39 drought stress-related genes with variations in the CDS region in Huaye3.

Conclusions:

Huaye3 possesses strong drought stress tolerance.
This study provides a basis for selecting drought-resistant rice germplasm.