Proteomic analysis of rice leaves shows the different regulations to osmotic stress and stress signals.
Following the idea of partial root-zone drying (PRD) in crop cultivation, the morphological and physiological responses to partial root osmotic stress (PROS) and whole root osmotic stress (WROS) were investigated in rice. WROS caused stress symptoms like leaf rolling and membrane leakage. PROS stimulated stress signals, but did not cause severe leaf damage. By proteomic analysis, a total of 58 proteins showed differential expression after one or both treatments, and functional classification of these proteins suggests that stress signals regulate photosynthesis, carbohydrate and energy metabolism. Two other proteins (anthranilate synthase and submergence-induced nickel-binding protein) were upregulated only in the PROS plants, indicating their important roles in stress resistance. Additionally, more enzymes were involved in stress defense, redox homeostasis, lignin and ethylene synthesis in WROS leaves, suggesting a more comprehensive regulatory mechanism induced by osmotic stress. This study provides new insights into the complex molecular networks within plant leaves involved in the adaptation to osmotic stress and stress signals.
Huazhong Agricultural University, Wuhan 430070, China.
Lie-Bo
LB
Shu
Wei
W
Ding
Jin-Hong
JH
Wu
Fang-Jun
FJ
Feng
Li-Jun
LJ
Luo
Han-Wei
HW
Mei
D000595:Amino Acid Sequence; D015180:Electrophoresis, Gel, Two-Dimensional; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D012275:Oryza / Q000033:anatomy & histology / Q000378:metabolism*; D009995:Osmosis / Q000502:physiology*; D018515:Plant Leaves / Q000378:metabolism*; D010940:Plant Proteins / Q000737:chemistry / Q000145:classification / Q000378:metabolism; D018517:Plant Roots / Q000502:physiology; D040901:Proteomics / Q000379:methods*; D015398:Signal Transduction; D013312:Stress, Physiological
D010940:Plant Proteins