Protein profile analysis of salt-responsive proteins in leaves and roots in two cultivars of creeping bentgrass differing in salinity tolerance |
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Authors: | Chenping Xu Tim Sibicky Bingru Huang |
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Institution: | (1) Department of Plant Biology and Pathology, Rutgers University, New Brunswick, NJ 08901, USA; |
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Abstract: | Knowledge of stress-responsive proteins is critical for further understanding the molecular mechanisms of stress tolerance.
The objectives of this study were to establish a proteomic map for a perennial grass species, creeping bentgrass (A. stolonifera L.), and to identify differentially expressed, salt-responsive proteins in two cultivars differing in salinity tolerance.
Plants of two cultivars (‘Penncross’ and ‘Penn-A4’) were irrigated daily with water (control) or NaCl solution to induce salinity
stress in a growth chamber. Salinity stress was obtained by adding NaCl solution of 2, 4, 6, and 8 dS m−1 in the soil daily for 2-day intervals at each concentration, and then by watering soil with 10 dS m−1 solution daily for 28 days. For proteomic map, using two-dimensional electrophoresis (2-DE), approximately 420 and 300 protein
spots were detected in leaves and roots, respectively. A total of 148 leaf protein spots and 40 root protein spots were excised
from the 2-DE gels and subjected to mass spectrometry analysis. In total, 106 leaf protein spots and 24 root protein spots
were successfully identified. Leaves had more salt-responsive proteins than roots in both cultivars. The superior salt tolerance
in ‘Penn-A4’, indicated by shoot extension rate, relative water content, and cell membrane stability during the 28-day salinity
stress could be mainly associated with its higher level of vacuolar H+-ATPase in roots and UDP-sulfoquinovose synthase, methionine synthase, and glucan exohydrolase in leaves, as well as increased
accumulation of catalase and glutathione S-transferase in leaves. Our results suggest that salinity tolerance in creeping bentgrass could be in part controlled by an
alteration of ion transport through vacuolar H+-ATPase in roots, maintenance of the functionality and integrity of thylakoid membranes, sustained polyamine biosynthesis,
and by the activation of cell wall loosening proteins and antioxidant defense mechanisms. |
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