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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

Effect of irradiation and soil moisture on WUE. (A) Total leaf area or (B) total root length are plotted against the water use of VJ 10 wheat plants. Plants were exposed to control conditions (moderate light and well-watered) or to a reduction in either light (low light) or soil moisture in the bottom part of the rhizoboxes (low water), or to a combination of low light and soil moisture (low light + low water), respectively (mean value ±SE, n = 4).
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Figure 7: Effect of irradiation and soil moisture on WUE. (A) Total leaf area or (B) total root length are plotted against the water use of VJ 10 wheat plants. Plants were exposed to control conditions (moderate light and well-watered) or to a reduction in either light (low light) or soil moisture in the bottom part of the rhizoboxes (low water), or to a combination of low light and soil moisture (low light + low water), respectively (mean value ±SE, n = 4).

Mentions: Light did not alter the WUE of VJ 10 plants. In contrast, low soil moisture in the bottom part of the rhizoboxes compared to well-watered conditions increased WUE (Fig. 7A). Consequently, plants treated with limited water supply used less water to build up a comparable leaf area size than plants grown under high soil water content. Plants grown under low soil moisture not only exhibited a 40% improved WUE, but also reduced water uptake rate per root length by approximately 40% (Fig. 7B). Under low light intensities, however, the water uptake per root length was up to 2.2 times higher. Consequently, the lowest water uptake rate per root length was found in plants exposed to higher light regimes combined with low soil water, and highest uptake values were detected in plants grown at low light combined with high soil water conditions. This led to an enhancement of water uptake by a factor of approximately 2.6 (Fig. 7B).


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)

Effect of irradiation and soil moisture on WUE. (A) Total leaf area or (B) total root length are plotted against the water use of VJ 10 wheat plants. Plants were exposed to control conditions (moderate light and well-watered) or to a reduction in either light (low light) or soil moisture in the bottom part of the rhizoboxes (low water), or to a combination of low light and soil moisture (low light + low water), respectively (mean value ±SE, n = 4).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

Figure 7: Effect of irradiation and soil moisture on WUE. (A) Total leaf area or (B) total root length are plotted against the water use of VJ 10 wheat plants. Plants were exposed to control conditions (moderate light and well-watered) or to a reduction in either light (low light) or soil moisture in the bottom part of the rhizoboxes (low water), or to a combination of low light and soil moisture (low light + low water), respectively (mean value ±SE, n = 4).
Mentions: Light did not alter the WUE of VJ 10 plants. In contrast, low soil moisture in the bottom part of the rhizoboxes compared to well-watered conditions increased WUE (Fig. 7A). Consequently, plants treated with limited water supply used less water to build up a comparable leaf area size than plants grown under high soil water content. Plants grown under low soil moisture not only exhibited a 40% improved WUE, but also reduced water uptake rate per root length by approximately 40% (Fig. 7B). Under low light intensities, however, the water uptake per root length was up to 2.2 times higher. Consequently, the lowest water uptake rate per root length was found in plants exposed to higher light regimes combined with low soil water, and highest uptake values were detected in plants grown at low light combined with high soil water conditions. This led to an enhancement of water uptake by a factor of approximately 2.6 (Fig. 7B).

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