Effect of salt tolerance on biomass production in a large population of sorghum accessions

Salinity causes major reductions in cultivated land area, crop productivity, and crop quality, and salt-tolerant crops have been required to sustain agriculture in salinized areas. The annual C4 crop plant Sorghum bicolor (L.) Moench is salt tolerant, with large variation among accessions. Sorghum’s...

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Bibliographic Details
Published in:Breeding Science 2020, Vol.70(2), pp.167-175
Main Authors: Yamazaki, Kiyoshi, Ishimori, Motoyuki, Kajiya-Kanegae, Hiromi, Takanashi, Hideki, Fujimoto, Masaru, Yoneda, Jun-ichi, Yano, Kentaro, Koshiba, Taichi, Tanaka, Ryokei, Iwata, Hiroyoshi, Tokunaga, Tsuyoshi, Tsutsumi, Nobuhiro, Fujiwara, Toru
Format: Article
Language:English
Subjects:
Abiotic stress
Biomass
Cereal crops
Crop production
Crops
Cultivated lands
Genetic analysis
Genetic factors
Genetic resources
Genome-wide association studies
genome-wide association study
Genomes
natural variation
Nucleotides
Performance evaluation
Plant breeding
Research Paper
Saline soils
Salinity tolerance
Salt
Salt tolerance
Single-nucleotide polymorphism
Sodium chloride
Sorghum
Sorghum bicolor
Stress
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Summary:Salinity causes major reductions in cultivated land area, crop productivity, and crop quality, and salt-tolerant crops have been required to sustain agriculture in salinized areas. The annual C4 crop plant Sorghum bicolor (L.) Moench is salt tolerant, with large variation among accessions. Sorghum’s salt tolerance is often evaluated during early growth, but such evaluations are weakly related to overall performance. Here, we evaluated salt tolerance of 415 sorghum accessions grown in saline soil (0, 50, 100, and 150 mM NaCl) for 3 months. Some accessions produced up to 400 g per plant of biomass and showed no growth inhibition at 50 mM NaCl. Our analysis indicated that the genetic factors that affected biomass production under 100 mM salt stress were more different from those without salt stress, comparing to the differences between those under 50 mM and 100 mM salt stress. A genome-wide association study for salt tolerance identified two single-nucleotide polymorphisms (SNPs) that were significantly associated with biomass production, only at 50 mM NaCl. Additionally, two SNPs were significantly associated with salt tolerance index as an indicator for growth response of each accession to salt stress. Our results offer candidate genetic resources and SNP markers for breeding salt-tolerant sorghum.
ISSN:1344-7610
1347-3735
DOI:10.1270/jsbbs.19009