Campus Units

Ecology, Evolution and Organismal Biology, Genetics, Development and Cell Biology

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

10-23-2019

Journal or Book Title

The Plant Journal

DOI

10.1111/tpj.14580

Abstract

Development of salt-tolerant genotypes is pivotal for the effective utilization of salinized land and to increase global crop productivity. Several cotton species comprise the most important source of textile fibers globally, and these are increasingly grown on marginal or increasingly saline agroecosystems. The allopolyploid cotton species also provide a model system for polyploid research, of relevance here because polyploidy was suggested to be associated with increased adaptation to stress. To evaluate genetic variation of salt tolerance among cotton species, 17 diverse accessions of allopolyploid (AD-genome) and diploid (A-, D-genome) Gossypium were evaluated for a total of 29 morphological and physiological traits associated with salt tolerance. For most morphological and physiological traits, cotton accessions showed highly variable responses to two weeks of exposure to moderate (50 mM NaCl) and high (100 mM NaCl) hydroponic salinity treatments. Results showed that the most salt tolerant species were the NE Brazilian allopolyploid G. mustelinum, the D-genome diploid G. klotzschianum from the Galapagos Islands, following by the African/Asian, A-genome diploids. Generally, A-genome accessions outperformed D-genome cottons under salinity conditions. Allopolyploid accessions did not show significant differences from either diploid genomic group in salt tolerance, but they were more similar to one of the two progenitor lineages. Our findings demonstrate that allopolyploidy per se need not be associated with increased salinity stress tolerance, and provide information relevant to utilization of the secondary Gossypium gene pool for breeding improved salt tolerance.

Comments

This is the peer reviewed version of the following article: Dong, Yating, Guanjing Hu, Jingwen Yu, Sandi Win Thu, Corrinne E. Grover, Shuijin Zhu, and Jonathan F. Wendel. "Salt tolerance diversity in diploid and polyploid cotton (Gossypium) species." The Plant Journal (2019), which has been published in final form at doi: 10.1111/tpj.14580. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Copyright Owner

The Authors, The Plant Journal, John Wiley & Sons Ltd

Language

en

File Format

application/pdf

Available for download on Friday, October 23, 2020

Published Version

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