Chromosomal location of traits associated with wheat seedling water and phosphorus use efficiency under different water and phosphorus stresses.
The objective of this study was to locate chromosomes for improving water and phosphorus-deficiency tolerance of wheat at the seedling stage. A set of Chinese Spring-Egyptian Red wheat substitution lines and their parent Chinese Spring (recipient) and Egyptian Red (donor) cultivars were measured to determine the chromosomal locations of genes controlling water use efficiency (WUE) and phosphorus use efficiency (PUE) under different water and phosphorus conditions. The results underlined that chromosomes 1A, 7A, 7B, and 3A showed higher leaf water use efficiency (WUE(l) = Pn/Tr; Pn = photosynthetic rate; Tr = transpiration rate) under W-P (Hoagland solution with 1/2P), -W-P (Hoagland solution with 1/2P and 10% PEG). Chromosomes 7A, 3D, 2B, 3B, and 4B may carry genes for positive effects on individual plant water use efficiency (WUE(p) = biomass/TWC; TWC = total water consumption) under WP (Hoagland solution), W-P and -W-P treatment. Chromosomes 7A and 7D carry genes for PUE enhancement under WP, -WP (Hoagland solution with 10% PEG) and W-P treatment. Chromosome 7A possibly has genes for controlling WUE and PUE simultaneously, which indicates that WUE and PUE may share the same genetic background. Phenotypic and genetic analysis of the investigated traits showed that photosynthetic rate (Pn) and transpiration rate (Tr), Tr and WUE(l) showed significant positive and negative correlations under WP, W-P, -WP and -W-P, W-P, -WP treatments, respectively. Dry mass (DM), WUE(P), PUT (phosphorus uptake) all showed significant positive correlation under WP, W-P and -WP treatment. PUE and phosphorus uptake (PUT = P uptake per plant) showed significant negative correlation under the four treatments. The results might provide useful information for improving WUE and PUE in wheat genetics.
Cao
Hong-Xing
HX
Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, CAS, Shijiazhuang, 050021, China.
Zhang
Zheng-Bin
ZB
Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, CAS, Shijiazhuang, 050021, China.
Sun
Cheng-Xu
CX
Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan 571339, China.
Shao
Hong-Bo
HB
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China.|Yantai Institute of Coastal Zone Research for Sustainable Development, Chinese Academy of Sciences, Yantai 264003, China.|Institute of Life Sciences, Qingdao University of Science& Technology, Qingdao266042, China.
Song
Wei-Yi
WY
Biology Department, Shangqiu Normal University, Shangqiu 476000, China.
Xu
Ping
P
Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, CAS, Shijiazhuang, 050021, China.
D000222:Adaptation, Physiological; D001947:Breeding; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D003681:Dehydration; D055864:Droughts; D017343:Genes, Plant; D056726:Genetic Association Studies; D010758:Phosphorus / Q000378:metabolism*; D010788:Photosynthesis / Q000235:genetics; D018526:Plant Transpiration / Q000235:genetics; D040641:Quantitative Trait Loci; D036226:Seedlings / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological; D014908:Triticum / Q000235:genetics / Q000378:metabolism*
D010758:Phosphorus