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The genetics of rhizosheath size in a multiparent mapping population of wheat.

Delhaize E, Rathjen TM, Cavanagh CR - J. Exp. Bot. (2015)

Bottom Line: Members of the basic helix-loop-helix family of transcription factors have previously been identified to regulate root hair length in Arabidopsis and rice.Since several wheat members of the basic helix-loop-helix family of genes are located within or near the QTL, these genes are candidates for controlling the long root hair trait.The QTL for rhizosheath size identified in this study provides the opportunity to implement marker-assisted selection to increase root hair length for improved phosphate acquisition in wheat.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Agriculture, GPO Box 1600, Canberra, ACT 2601, Australia delhaize@csiro.au.

No MeSH data available.


Related in: MedlinePlus

Frequency distributions of rhizosheath size for 466 lines of the 4-way (A) and 230 lines of the 8-way (B) MAGIC populations. The rhizosheath categories of parental and check lines are indicated by the arrows. Data are presented as the number of lines in each rhizosheath size category incrementing by 0.2g m–1 (the values for each line is the mean of n=4–6 seedlings).
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Figure 2: Frequency distributions of rhizosheath size for 466 lines of the 4-way (A) and 230 lines of the 8-way (B) MAGIC populations. The rhizosheath categories of parental and check lines are indicated by the arrows. Data are presented as the number of lines in each rhizosheath size category incrementing by 0.2g m–1 (the values for each line is the mean of n=4–6 seedlings).

Mentions: The parental lines of both the 4-way and 8-way MAGIC RILs showed relatively little variation for rhizosheath size and were intermediate between the check lines Spica and Maringa (Fig. 1). Analysis of both the 4-way and 8-way RILs showed evidence of transgressive segregation for rhizosheath size with the largest rhizosheaths similar to those of Maringa and numerous lines with rhizosheaths smaller than Spica (Fig. 2). The 4-way RILs varied by 1.9-fold between the largest and smallest rhizosheaths whereas the variation between parental lines was only 1.2-fold. Similarly, the 8-way RILs varied by 2.2-fold whereas parental lines varied by only 1.3-fold. The two populations screened included Westonia, Yitpi, and Baxter as parents in common as well as the same check lines Spica and Maringa. The average of the 4-way RILs was 3.79±0.35g m–1 compared with 4.01±0.52g m–1 (mean ±standard deviation) for the 8-way RILs. The common parental and check lines were also, on average, larger for the 8-way screen but their relative rankings for rhizosheath size were similar for both screens (Fig. 2).


The genetics of rhizosheath size in a multiparent mapping population of wheat.

Delhaize E, Rathjen TM, Cavanagh CR - J. Exp. Bot. (2015)

Frequency distributions of rhizosheath size for 466 lines of the 4-way (A) and 230 lines of the 8-way (B) MAGIC populations. The rhizosheath categories of parental and check lines are indicated by the arrows. Data are presented as the number of lines in each rhizosheath size category incrementing by 0.2g m–1 (the values for each line is the mean of n=4–6 seedlings).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4507764&req=5

Figure 2: Frequency distributions of rhizosheath size for 466 lines of the 4-way (A) and 230 lines of the 8-way (B) MAGIC populations. The rhizosheath categories of parental and check lines are indicated by the arrows. Data are presented as the number of lines in each rhizosheath size category incrementing by 0.2g m–1 (the values for each line is the mean of n=4–6 seedlings).
Mentions: The parental lines of both the 4-way and 8-way MAGIC RILs showed relatively little variation for rhizosheath size and were intermediate between the check lines Spica and Maringa (Fig. 1). Analysis of both the 4-way and 8-way RILs showed evidence of transgressive segregation for rhizosheath size with the largest rhizosheaths similar to those of Maringa and numerous lines with rhizosheaths smaller than Spica (Fig. 2). The 4-way RILs varied by 1.9-fold between the largest and smallest rhizosheaths whereas the variation between parental lines was only 1.2-fold. Similarly, the 8-way RILs varied by 2.2-fold whereas parental lines varied by only 1.3-fold. The two populations screened included Westonia, Yitpi, and Baxter as parents in common as well as the same check lines Spica and Maringa. The average of the 4-way RILs was 3.79±0.35g m–1 compared with 4.01±0.52g m–1 (mean ±standard deviation) for the 8-way RILs. The common parental and check lines were also, on average, larger for the 8-way screen but their relative rankings for rhizosheath size were similar for both screens (Fig. 2).

Bottom Line: Members of the basic helix-loop-helix family of transcription factors have previously been identified to regulate root hair length in Arabidopsis and rice.Since several wheat members of the basic helix-loop-helix family of genes are located within or near the QTL, these genes are candidates for controlling the long root hair trait.The QTL for rhizosheath size identified in this study provides the opportunity to implement marker-assisted selection to increase root hair length for improved phosphate acquisition in wheat.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Agriculture, GPO Box 1600, Canberra, ACT 2601, Australia delhaize@csiro.au.

No MeSH data available.


Related in: MedlinePlus