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Simultaneous effects of leaf irradiance and soil moisture on growth and root system architecture of novel wheat genotypes: implications for phenotyping.

Nagel KA, Bonnett D, Furbank R, Walter A, Schurr U, Watt M - J. Exp. Bot. (2015)

Bottom Line: In contrast, the other genotype showed much less plasticity and responsiveness to upper moist soil, but maintained deeper penetration of roots into the dry layer.The sum of shoot and root responses was greater when treated simultaneously to low light and low soil water, compared to each treatment alone, suggesting the value of whole plant phenotyping in response to multiple conditions for agronomic improvement.The results suggest that canopy management for increased irradiation of leaves would encourage root growth into deeper drier soil, and that genetic variation within closely related breeding lines may exist to favour surface root growth in response to irrigation or in-season rainfall.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany k.nagel@fz-juelich.de.

No MeSH data available.


Related in: MedlinePlus

Summary of root growth responses of VJ 10 wheat plants to leaf irradiation and soil moisture 20 days after germination. Ratio between plants exposed to control conditions (moderate light and well watered) and the other three treatment combinations: (A) reduction in light intensity; (B) reduction in soil moisture; and (C) reduction in both light and soil moisture; quantified for root length in the top and bottom part of the rhizoboxes, root depth, and number of lateral roots. Values prior to plants exposed to control conditions were set to 100% (mean value ±SE, n = 4). Additionally, the theoretical root growth reduction under low light combined with low soil moisture (grey bars, C) was calculated as the sum of relative growth reductions under low light and the relative growth reductions under low soil.
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Figure 6: Summary of root growth responses of VJ 10 wheat plants to leaf irradiation and soil moisture 20 days after germination. Ratio between plants exposed to control conditions (moderate light and well watered) and the other three treatment combinations: (A) reduction in light intensity; (B) reduction in soil moisture; and (C) reduction in both light and soil moisture; quantified for root length in the top and bottom part of the rhizoboxes, root depth, and number of lateral roots. Values prior to plants exposed to control conditions were set to 100% (mean value ±SE, n = 4). Additionally, the theoretical root growth reduction under low light combined with low soil moisture (grey bars, C) was calculated as the sum of relative growth reductions under low light and the relative growth reductions under low soil.

Mentions: Low light treatment reduced root growth in top and bottom parts of the rhizobox, but low water treatment increased root length, notably of lateral roots, in the top, well-watered soil and reduced it only slightly in the bottom soil (Fig. 6A,B). Simultaneous treatment of low light and low water in the bottom compartment also increased root length in the top part of the boxes, but to a lesser extent than in response to low water alone (Fig. 6C). In other words, extra root growth in upper layers-when the deeper layer was dry-was lower at low leaf light than higher leaf light. Simultaneous low leaf light and low soil water in the lower compartment decreased root growth more than under low light treatment alone. Expressed another way, low leaf light inhibited root growth in the lower compartment more when the soil was dry than wet.


Simultaneous effects of leaf irradiance and soil moisture on growth and root system architecture of novel wheat genotypes: implications for phenotyping.

Nagel KA, Bonnett D, Furbank R, Walter A, Schurr U, Watt M - J. Exp. Bot. (2015)

Summary of root growth responses of VJ 10 wheat plants to leaf irradiation and soil moisture 20 days after germination. Ratio between plants exposed to control conditions (moderate light and well watered) and the other three treatment combinations: (A) reduction in light intensity; (B) reduction in soil moisture; and (C) reduction in both light and soil moisture; quantified for root length in the top and bottom part of the rhizoboxes, root depth, and number of lateral roots. Values prior to plants exposed to control conditions were set to 100% (mean value ±SE, n = 4). Additionally, the theoretical root growth reduction under low light combined with low soil moisture (grey bars, C) was calculated as the sum of relative growth reductions under low light and the relative growth reductions under low soil.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4585422&req=5

Figure 6: Summary of root growth responses of VJ 10 wheat plants to leaf irradiation and soil moisture 20 days after germination. Ratio between plants exposed to control conditions (moderate light and well watered) and the other three treatment combinations: (A) reduction in light intensity; (B) reduction in soil moisture; and (C) reduction in both light and soil moisture; quantified for root length in the top and bottom part of the rhizoboxes, root depth, and number of lateral roots. Values prior to plants exposed to control conditions were set to 100% (mean value ±SE, n = 4). Additionally, the theoretical root growth reduction under low light combined with low soil moisture (grey bars, C) was calculated as the sum of relative growth reductions under low light and the relative growth reductions under low soil.
Mentions: Low light treatment reduced root growth in top and bottom parts of the rhizobox, but low water treatment increased root length, notably of lateral roots, in the top, well-watered soil and reduced it only slightly in the bottom soil (Fig. 6A,B). Simultaneous treatment of low light and low water in the bottom compartment also increased root length in the top part of the boxes, but to a lesser extent than in response to low water alone (Fig. 6C). In other words, extra root growth in upper layers-when the deeper layer was dry-was lower at low leaf light than higher leaf light. Simultaneous low leaf light and low soil water in the lower compartment decreased root growth more than under low light treatment alone. Expressed another way, low leaf light inhibited root growth in the lower compartment more when the soil was dry than wet.

Bottom Line: In contrast, the other genotype showed much less plasticity and responsiveness to upper moist soil, but maintained deeper penetration of roots into the dry layer.The sum of shoot and root responses was greater when treated simultaneously to low light and low soil water, compared to each treatment alone, suggesting the value of whole plant phenotyping in response to multiple conditions for agronomic improvement.The results suggest that canopy management for increased irradiation of leaves would encourage root growth into deeper drier soil, and that genetic variation within closely related breeding lines may exist to favour surface root growth in response to irrigation or in-season rainfall.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany k.nagel@fz-juelich.de.

No MeSH data available.


Related in: MedlinePlus