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000202475 1001_ $$0P:(DE-Juel1)129373$$aNagel, Kerstin$$b0$$eCorresponding author$$ufzj
000202475 245__ $$aSimultaneous effects of leaf irradiance and soil moisture on growth and root system architecture of novel wheat genotypes: implications for phenotyping
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000202475 520__ $$aPlants in the field are exposed to varying light and moisture. Agronomic improvement requires knowledge of whole-plant phenotypes expressed in response to simultaneous variation in these essential resources. Most phenotypes, however, have been described from experiments where resources are varied singularly. To test the importance of varying shoot and root resources for phenotyping studies, sister pre-breeding lines of wheat were phenotyped in response to independent or simultaneous exposure to two light levels and soil moisture profiles. The distribution and architecture of the root systems depended strongly on the moisture of the deeper soil layer. For one genotype, roots, specifically lateral roots, were stimulated to grow into moist soil when the upper zone was well-watered and were inhibited by drier deep zones. In contrast, the other genotype showed much less plasticity and responsiveness to upper moist soil, but maintained deeper penetration of roots into the dry layer. The sum of shoot and root responses was greater when treated simultaneously to low light and low soil water, compared to each treatment alone, suggesting the value of whole plant phenotyping in response to multiple conditions for agronomic improvement. The results suggest that canopy management for increased irradiation of leaves would encourage root growth into deeper drier soil, and that genetic variation within closely related breeding lines may exist to favour surface root growth in response to irrigation or in-season rainfall. 
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000202475 7001_ $$0P:(DE-HGF)0$$aBonnett, David$$b1
000202475 7001_ $$0P:(DE-HGF)0$$aFurbank, Robert$$b2
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000202475 7001_ $$0P:(DE-Juel1)129402$$aSchurr, U.$$b4$$ufzj
000202475 7001_ $$0P:(DE-Juel1)166460$$aWatt, M.$$b5$$ufzj
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