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Intensive field phenotyping of maize (Zea mays L.) root crowns identifies phenes and phene integration associated with plant growth and nitrogen acquisition.

York LM, Lynch JP - J. Exp. Bot. (2015)

Bottom Line: Root phenes from both older and younger whorls of nodal roots contributed to variation in shoot mass and N uptake.The additive integration of root phenes accounted for 70% of the variation observed in shoot mass in low N soil.These results demonstrate the utility of intensive phenotyping of mature root systems, as well as the importance of phene integration in soil resource acquisition.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA Ecology Graduate Program, The Pennsylvania State University, University Park, PA 16802, USA.

No MeSH data available.


Six root phenes were measured for every whorl in high and low nitrogen soil, and data for three contrasting genotypes are shown here. Node position 1 is the oldest whorl. (A–F) Plots of nodal occupancy, nodal root growth angle, nodal root diameter, distance to branching, lateral root density, and lateral root length, respectively. Points are the average of the four replicates. Within each panel, data from high nitrogen (HN) are depicted with filled circles and in low nitrogen (LN) with filled triangles, and different genotypes are represented by line types. Data for all phenes and all genotypes with standard errors are included in the Supplementary Figs S2–S8 at JXB online.
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Figure 2: Six root phenes were measured for every whorl in high and low nitrogen soil, and data for three contrasting genotypes are shown here. Node position 1 is the oldest whorl. (A–F) Plots of nodal occupancy, nodal root growth angle, nodal root diameter, distance to branching, lateral root density, and lateral root length, respectively. Points are the average of the four replicates. Within each panel, data from high nitrogen (HN) are depicted with filled circles and in low nitrogen (LN) with filled triangles, and different genotypes are represented by line types. Data for all phenes and all genotypes with standard errors are included in the Supplementary Figs S2–S8 at JXB online.

Mentions: Nodal occupancy (NO) increased with the node position, from an average of four roots in the first whorl to an average of 11 roots in the last whorl (Table 2; Fig. 2A; Supplementary Fig. S3 at JXB online; P<0.01). Average nodal occupancy among genotypes ranged between 5.3 and 6.8 roots (P<0.01). Average nodal occupancy decreased from 6.2 in HN to 5.5 in LN (P<0.038). The rate of change and total number of roots differed among genotypes, where some produced four roots on the first 3–4 whorls before increasing, while others began producing more roots earlier (node×genotype significant interaction). The node position explained 53.6% of the variation in NO, while genotype explained 2.28% (Table 3).


Intensive field phenotyping of maize (Zea mays L.) root crowns identifies phenes and phene integration associated with plant growth and nitrogen acquisition.

York LM, Lynch JP - J. Exp. Bot. (2015)

Six root phenes were measured for every whorl in high and low nitrogen soil, and data for three contrasting genotypes are shown here. Node position 1 is the oldest whorl. (A–F) Plots of nodal occupancy, nodal root growth angle, nodal root diameter, distance to branching, lateral root density, and lateral root length, respectively. Points are the average of the four replicates. Within each panel, data from high nitrogen (HN) are depicted with filled circles and in low nitrogen (LN) with filled triangles, and different genotypes are represented by line types. Data for all phenes and all genotypes with standard errors are included in the Supplementary Figs S2–S8 at JXB online.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4585417&req=5

Figure 2: Six root phenes were measured for every whorl in high and low nitrogen soil, and data for three contrasting genotypes are shown here. Node position 1 is the oldest whorl. (A–F) Plots of nodal occupancy, nodal root growth angle, nodal root diameter, distance to branching, lateral root density, and lateral root length, respectively. Points are the average of the four replicates. Within each panel, data from high nitrogen (HN) are depicted with filled circles and in low nitrogen (LN) with filled triangles, and different genotypes are represented by line types. Data for all phenes and all genotypes with standard errors are included in the Supplementary Figs S2–S8 at JXB online.
Mentions: Nodal occupancy (NO) increased with the node position, from an average of four roots in the first whorl to an average of 11 roots in the last whorl (Table 2; Fig. 2A; Supplementary Fig. S3 at JXB online; P<0.01). Average nodal occupancy among genotypes ranged between 5.3 and 6.8 roots (P<0.01). Average nodal occupancy decreased from 6.2 in HN to 5.5 in LN (P<0.038). The rate of change and total number of roots differed among genotypes, where some produced four roots on the first 3–4 whorls before increasing, while others began producing more roots earlier (node×genotype significant interaction). The node position explained 53.6% of the variation in NO, while genotype explained 2.28% (Table 3).

Bottom Line: Root phenes from both older and younger whorls of nodal roots contributed to variation in shoot mass and N uptake.The additive integration of root phenes accounted for 70% of the variation observed in shoot mass in low N soil.These results demonstrate the utility of intensive phenotyping of mature root systems, as well as the importance of phene integration in soil resource acquisition.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA Ecology Graduate Program, The Pennsylvania State University, University Park, PA 16802, USA.

No MeSH data available.