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Favorable alleles for stem water-soluble carbohydrates identified by association analysis contribute to grain weight under drought stress conditions in wheat.

Li W, Zhang B, Li R, Chang X, Jing R - PLoS ONE (2015)

Bottom Line: Sixteen novel WSC-favorable alleles were identified, and five of them contributed to significantly higher TGW.In addition, pyramiding WSC favorable alleles was not only effective for obtaining accessions with higher WSC, but also for enhancing TGW under different water regimes.The results indicate a high potential for using marker-assisted selection to pyramid WSC favorable alleles in improving WSC and TGW in wheat.

View Article: PubMed Central - PubMed

Affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement / Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Agronomy College, Shanxi Agricultural University, Taigu 030801, China.

ABSTRACT
Drought is a major environmental constraint to crop distribution and productivity. Stem water-soluble carbohydrates (WSC) buffer wheat grain yield against conditions unfavorable for photosynthesis during the grain filling stage. In this study, 262 winter wheat accessions and 209 genome-wide SSR markers were collected and used to undertake association analysis based on a mixed linear model (MLM). The WSC in different internodes at three growth stages and 1000-grain weight (TGW) were investigated under four environmental regimes (well-watered, drought stress during the whole growth period, and two levels of terminal drought stress imposed by chemical desiccation under the well-watered and drought stress during the whole growth period conditions). Under diverse drought stress conditions, WSC in lower internodes showed significant positive correlations with TGW, especially at the flowering stage under well-watered conditions and at grain filling under drought stress. Sixteen novel WSC-favorable alleles were identified, and five of them contributed to significantly higher TGW. In addition, pyramiding WSC favorable alleles was not only effective for obtaining accessions with higher WSC, but also for enhancing TGW under different water regimes. During the past fifty years of wheat breeding, WSC was selected incidentally. The average number of favorable WSC alleles increased from 1.13 in the pre-1960 period to 4.41 in the post-2000 period. The results indicate a high potential for using marker-assisted selection to pyramid WSC favorable alleles in improving WSC and TGW in wheat.

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TGW and WSC of modern varieties from different decades under four water regimes.Pre-1960, before 1960; Post-2000, after 2000; There were 8, 27, 54, 39, 58 and 51 accessions released in Pre-1960, during the 1960s, 1970s, 1980s, 1990s, and Post-2000, respectively. Ten landraces and 15 accessions with unknown released decades were excluded. Bars indicate 2×SE.
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pone.0119438.g006: TGW and WSC of modern varieties from different decades under four water regimes.Pre-1960, before 1960; Post-2000, after 2000; There were 8, 27, 54, 39, 58 and 51 accessions released in Pre-1960, during the 1960s, 1970s, 1980s, 1990s, and Post-2000, respectively. Ten landraces and 15 accessions with unknown released decades were excluded. Bars indicate 2×SE.

Mentions: WSC in lower internodes increased from means of 34.3, 206.6, 101.9, 146.6 before 1960 (pre-1960) to 90.7, 247.2, 118.9, 230.1 after 2000 (post-2000) under CK-WW, CK-DS, KI-WW, KI-DS, respectively; the trend for WSC of whole stems was the same (Fig. 6; S6 Table). Overall, the TGW and WSC of modern varieties gradually increased from pre-1960 to post-2000 under all four water regimes (Fig. 6).


Favorable alleles for stem water-soluble carbohydrates identified by association analysis contribute to grain weight under drought stress conditions in wheat.

Li W, Zhang B, Li R, Chang X, Jing R - PLoS ONE (2015)

TGW and WSC of modern varieties from different decades under four water regimes.Pre-1960, before 1960; Post-2000, after 2000; There were 8, 27, 54, 39, 58 and 51 accessions released in Pre-1960, during the 1960s, 1970s, 1980s, 1990s, and Post-2000, respectively. Ten landraces and 15 accessions with unknown released decades were excluded. Bars indicate 2×SE.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4358973&req=5

pone.0119438.g006: TGW and WSC of modern varieties from different decades under four water regimes.Pre-1960, before 1960; Post-2000, after 2000; There were 8, 27, 54, 39, 58 and 51 accessions released in Pre-1960, during the 1960s, 1970s, 1980s, 1990s, and Post-2000, respectively. Ten landraces and 15 accessions with unknown released decades were excluded. Bars indicate 2×SE.
Mentions: WSC in lower internodes increased from means of 34.3, 206.6, 101.9, 146.6 before 1960 (pre-1960) to 90.7, 247.2, 118.9, 230.1 after 2000 (post-2000) under CK-WW, CK-DS, KI-WW, KI-DS, respectively; the trend for WSC of whole stems was the same (Fig. 6; S6 Table). Overall, the TGW and WSC of modern varieties gradually increased from pre-1960 to post-2000 under all four water regimes (Fig. 6).

Bottom Line: Sixteen novel WSC-favorable alleles were identified, and five of them contributed to significantly higher TGW.In addition, pyramiding WSC favorable alleles was not only effective for obtaining accessions with higher WSC, but also for enhancing TGW under different water regimes.The results indicate a high potential for using marker-assisted selection to pyramid WSC favorable alleles in improving WSC and TGW in wheat.

View Article: PubMed Central - PubMed

Affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement / Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Agronomy College, Shanxi Agricultural University, Taigu 030801, China.

ABSTRACT
Drought is a major environmental constraint to crop distribution and productivity. Stem water-soluble carbohydrates (WSC) buffer wheat grain yield against conditions unfavorable for photosynthesis during the grain filling stage. In this study, 262 winter wheat accessions and 209 genome-wide SSR markers were collected and used to undertake association analysis based on a mixed linear model (MLM). The WSC in different internodes at three growth stages and 1000-grain weight (TGW) were investigated under four environmental regimes (well-watered, drought stress during the whole growth period, and two levels of terminal drought stress imposed by chemical desiccation under the well-watered and drought stress during the whole growth period conditions). Under diverse drought stress conditions, WSC in lower internodes showed significant positive correlations with TGW, especially at the flowering stage under well-watered conditions and at grain filling under drought stress. Sixteen novel WSC-favorable alleles were identified, and five of them contributed to significantly higher TGW. In addition, pyramiding WSC favorable alleles was not only effective for obtaining accessions with higher WSC, but also for enhancing TGW under different water regimes. During the past fifty years of wheat breeding, WSC was selected incidentally. The average number of favorable WSC alleles increased from 1.13 in the pre-1960 period to 4.41 in the post-2000 period. The results indicate a high potential for using marker-assisted selection to pyramid WSC favorable alleles in improving WSC and TGW in wheat.

Show MeSH