Comprehensive evaluation of salt-alkali tolerance of rice germplasms at germination and seedling stages and analysis of salt-tolerant genes.

Pingyong Sun; Wuhan Zhang; Fu Shu; Qiang HE; Li Zhang; Zhuhong Yang; Zhirong Peng; Yun Xie; Huafeng Deng

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Comprehensive evaluation of salt-alkali tolerance of rice germplasms at germination and seedling stages and analysis of salt-tolerant genes.

Author: Pingyong SUN ¹ ; Wuhan ZHANG ¹ ; Fu SHU ¹ ; Qiang HE ¹ ; Li ZHANG ² ; Zhuhong YANG ¹ ; Zhirong PENG ¹ ; Yun XIE ¹ ; Huafeng DENG ¹
Author Information

1. State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha 410125, Hunan, China.
2. Nuclear Agriculture and Space Breeding Research Institute, Changsha 410125, Hunan, China.
Publication Type:Journal Article
Keywords: germplasm resource; rice; salt-alkaline stress; salt-tolerant gene
MeSH: Alkalies; Germination; Oryza/genetics*; Plant Breeding; Seedlings/genetics*
From: Chinese Journal of Biotechnology 2022;38(1):252-263
CountryChina
Language:Chinese
Abstract: Cultivating salt-alkali tolerant rice varieties is one of the important ways to meet the increasing food demand of growing global population. In this study, twenty-one rice germplasms with different salt-alkali tolerance were treated with six salt-alkali concentrations at germination and seedling stages. The germination potential, germination rate, shoot length, root length, root number, fresh weight of shoot and seedlings were measured. The average value of salt damage rate was used to evaluate the salt-alkali tolerance. As the salt-alkali concentration increases, the inhibition on seed germination and growth became more obvious. Upon treatment with 1% NaCl plus 0.25% NaHCO₃, the salt damage rate of germination rate has the largest variation, ranging from 0% to 89.80%. The salt damage rate of each trait shows a similar trend at all concentrations. Four germplasm resources with strong salt-alkali tolerance (Dajiugu, Nippobare, Mowanggu and 02428) and 7 sensitive germplasms were screened. The salt-tolerant gene sequence of 4 salt-alkali tolerant varieties and 3 sensitive germplasms were analyzed. OSHAL3 and OsRR22 were identical among the 7 germplasms, but SKC1 and DST showed clear variations between the salt-alkali tolerant and sensitive germplasms. Besides the salt-alkali tolerant germplasm resources, this study can also serve as a reference for mining of genes involved in salt-alkali tolerance and breeding of salt-alkali tolerant rice varieties.