Abstract
Two Job’s tears cultivars, yy18-1 (high resistance to drought stress) and yy12-7 (susceptible to drought stress) were used to investigate the responses of seed germination, root and seedling growth, and seedling antioxidant characteristics to drought stress simulated by polyethylene glycol (PEG) 6000 solutions with 0, -0.05, -0.1, -0.15, and -0.2 MPa osmotic potentials. The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution. The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution. The activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) in seedling increased and then decreased with the decrease of osmotic potential of PEG 6000 solution. -0.1 MPa was the optimal osmotic potential of PEG 6000 solution simulated drought stress at germination stage for Job’s tears. The proline content and activities of POD and CAT were important mechanisms for the maintenance of drought resistance in Job’s tears seedling.
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Claims 13
Claim · model-written summary
germination energy, germination rate, germination index decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
root and seedling lengths decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
root and seedling diameters decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
root and seedling fresh masses decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
root and seedling dry masses decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
seedling relative water content (RWC) decreased as PEG osmotic potential fell.
Verbatim
e0“The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
hydrogen peroxide (H2O2) increased as PEG osmotic potential fell.
Verbatim
e0“The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
malondialdehyde (MDA) increased as PEG osmotic potential fell.
Verbatim
e0“The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
proline increased as PEG osmotic potential fell.
Verbatim
e0“The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
peroxidase (POD), catalase (CAT) activities first increased then decreased as osmotic potential fell.
Verbatim
e0“The activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) in seedling increased and then decreased with the decrease of osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
ascorbate peroxidase (APX), and glutathione reductase (GR) activities first increased then decreased as osmotic potential fell.
Verbatim
e0“The activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) in seedling increased and then decreased with the decrease of osmotic potential of PEG 6000 solution.”
t0“Job’s Tears”
Claim · model-written summary
The authors identified -0.1 MPa as optimal PEG osmotic potential at germination.
Verbatim
e0“-0.1 MPa was the optimal osmotic potential of PEG 6000 solution simulated drought stress at germination stage for Job’s tears.”
Claim · model-written summary
Proline, POD and CAT were interpreted as important for seedling drought resistance.
Verbatim
e0“The proline content and activities of POD and CAT were important mechanisms for the maintenance of drought resistance in Job’s tears seedling.”