TY  - JOUR
AU  - Nagel, Kerstin
AU  - Bonnett, David
AU  - Furbank, Robert
AU  - Walter, A.
AU  - Schurr, U.
AU  - Watt, M.
TI  - Simultaneous effects of leaf irradiance and soil moisture on growth and root system architecture of novel wheat genotypes: implications for phenotyping
JO  - The journal of experimental botany
VL  - 66
IS  - 18
SN  - 0022-0957
CY  - Oxford
PB  - Univ. Press
M1  - FZJ-2015-04684
SP  - 5441-5452
PY  - 2015
AB  - Plants 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. 
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000361208000006
C6  - pmid:26089535
DO  - DOI:10.1093/jxb/erv290
UR  - https://juser.fz-juelich.de/record/202475
ER  -