Breeding Science
Online ISSN : 1347-3735
Print ISSN : 1344-7610
ISSN-L : 1344-7610
Research Papers
Effect of salt tolerance on biomass production in a large population of sorghum accessions
Kiyoshi YamazakiMotoyuki IshimoriHiromi Kajiya-KanegaeHideki TakanashiMasaru FujimotoJun-ichi YonedaKentaro YanoTaichi KoshibaRyokei TanakaHiroyoshi IwataTsuyoshi TokunagaNobuhiro TsutsumiToru Fujiwara
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Supplementary material

2020 Volume 70 Issue 2 Pages 167-175

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Abstract

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.

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© 2020 by JAPANESE SOCIETY OF BREEDING
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