Using mathematical models to evaluate germination rate and seedlings length of chickpea seed (Cicer arietinum L.) to osmotic stress at cardinal temperatures
Cicer arietinum is the 3 rd most important cool season legume crop growing in vast arid and semi-arid regions of the world. A lab experiment was designed using hydrothermal time model (HTT) to investigate the chickpea seed germination (SG) behavior, cardinal temperatures and germination responses ac...
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| Veröffentlicht in: | PloS one Jg. 16; H. 12; S. e0260990 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Journal Article |
| Sprache: | Englisch |
| Veröffentlicht: |
United States
Public Library of Science
17.12.2021
Public Library of Science (PLoS) |
| Schlagworte: | |
| ISSN: | 1932-6203, 1932-6203 |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Cicer arietinum
is the 3
rd
most important cool season legume crop growing in vast arid and semi-arid regions of the world. A lab experiment was designed using hydrothermal time model (HTT) to investigate the chickpea seed germination (SG) behavior, cardinal temperatures and germination responses across fluctuating temperatures (
T
s
) and water potentials (
Ψ
s
). Seeds of chickpea var. NIFA 1995 were germinated at six constant
T
s
(7, 14, 21, 28, 35 and 42°C) each having the following five water potentials: 0, -0.2, -0.4–0.6 and -0.8 MPa. Germination percentage (G%) decreased significantly at (*
P
≤ 0.05) from 86.7% at 28°C in -0.2 MPa to 10% in -0.2 MPa at 7°C. The germination rate (GR = 1/t
50
) against different
T
percentiles exhibited that linear increase was observed in the GR pattern above and below the
T
o.
Based on the confidence intervals of the model coefficients and (
R
2
: 0.96), the average cardinal temperatures were 4.7, 23 and 44.2°C for the base (
T
b
), optimal (
T
o
) and ceiling (
T
c
) temperatures respectively.
θT
1 value was observed maximum at 28°C in -0.2 MPa and decreases with decreasing
Ψ
(-0.8 MPa). In comparison with control, the
θT
2 value was also highest in -0.2 MPa at 28°C. The thermal time (TT) concept is well fitted to germination fraction data in distilled water with an
R
2
value increasing 0.972. The hydro time constant (
θ
H) increased with an increase in
T
to
T
o
and then decreased when
T
>
T
o
. The
ѱ
b(50)
irregularly varied with increasing
T
, σ
Ψ
b
was also recorded lowest (0.166 MPa) at 28°C and highest (0.457 MPa) at 7°C. Based on the statistical analysis, cardinal temperatures, hydrothermal time constant (
θ
HTT) and germination findings the HTT gives an insight into the interactive effect of
T
and
Ψ
on seed germination time courses under varying environmental conditions. |
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| Bibliographie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 ObjectType-Correction/Retraction-3 Competing Interests: The authors have declared that no competing interests exist. |
| ISSN: | 1932-6203 1932-6203 |
| DOI: | 10.1371/journal.pone.0260990 |