Abstract
Changes in water potential, growth elongation, photosynthesis of three-leaf-old seedlings of maize inbred line YQ7-96 under water deficit (WD) for 0.5, 1 and 2 h and re-watering (RW) for 24 h were characterized. Gene expression was analyzed using cDNA microarray covering 11,855 maize unigenes. As for whole maize plant, the expression of WD-regulated genes was characterized by up-regulation. The expression of WD-regulated genes was categorized into eight different patterns, respectively, in leaves and roots. Newly found and WD-affected cellular processes were metabolic process, amino acid and derivative metabolic process and cell death. A great number of the analyzed genes were found to be regulated specifically by RW and commonly by both WD and RW, respectively, in leaves. It is therefore concluded that (1) whole maize plant tolerance to WD, as well as growth recovery from WD, depends at least in part on transcriptional coordination between leaves and roots; (2) WD exerts effects on the maize, especially on basal metabolism; (3) WD could probably affect CO2 uptake and partitioning, and transport of fixed carbons; (4) WD could likely influence nuclear activity and genome stability; and (5) maize growth recovery from WD is likely involved in some specific signaling pathways related to RW-specific responsive genes.
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Abbreviations
- ASI:
-
Anthesis-silking interval
- CC:
-
CO2 concentration
- Down:
-
Down-regulated
- ER:
-
Early response
- EST:
-
Expressed sequence tag
- GO:
-
Gene ontology
- H:
-
Hour
- LR:
-
Late response
- nARVOL:
-
Normalized artifact removed volume
- PCR:
-
Polymerase chain reaction
- PEG:
-
Polyethylene glycol
- PR:
-
Photosynthetic rate
- qRT-PCR:
-
Quantitative real-time PCR
- RW:
-
Re-watering
- SC:
-
Stomatal conductance
- TR:
-
Transpiration rate
- Up:
-
Up-regulated
- WD:
-
Water deficit
- WP:
-
Water potential
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Acknowledgments
This work was supported by the National Basic Research Program of China No. 2011CB100100, the 948 Program from the Ministry of Agriculture of China (2001-205), the Development Program for Guangxi Science and Technology Research (Guikegong 0228019-6), grants from Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization (SB0803) and the Key Laboratory of Ministry of Education for Microbial and Plant Genetic Engineering (Director’s grant-06-11). We heartily thank Professor Hans J. Bohnert for suggestions on the manuscript.
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Communicated by F. Hochholdinger.
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122_2011_1638_MOESM4_ESM.xls
Table S4 Information on CyberT as well as relative expression folds of a total of 11,855 arrayed genes under WD and RW (XLS 10227 kb)
122_2011_1638_MOESM9_ESM.ppt
Fig. S1 Comparison between gene expression data from qRT-PCR and microarray analyses. The microarray data at each time point were reported with a mean value of ln nARVOLs from 4-spot data. The qRT-PCR data were presented as the mean values of three repeats. RW treatment was conducted after a 2-h WD treatment. RW, re-watering; WD, water deficit. (PPT 371 kb)
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Lu, HF., Dong, HT., Sun, CB. et al. The panorama of physiological responses and gene expression of whole plant of maize inbred line YQ7-96 at the three-leaf stage under water deficit and re-watering. Theor Appl Genet 123, 943–958 (2011). https://doi.org/10.1007/s00122-011-1638-0
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DOI: https://doi.org/10.1007/s00122-011-1638-0