Abstract
This study investigated the changes of leaf photosynthetic characteristic and chlorophyll fluorescence parameter responding to drought stress (DS) in two species of maize at elongating stage. The results of net photosynthesis rate (Pn) and light intensity response curve indicated that Pn reduced with enhanced light intensity. Photoinhibition in varying degrees appeared in different genotype varieties, and DS intensified the extent of photoinhibition. Results showed that for DS at elongating stage, Pn of the cultivar JD28 was insensitive to highlight. Pmax and Rd decreased, and physiological activity reduced obviously. Compared with JD28, JD261 decreased more. Moreover, DS resulted in decreased light compensation point (LCP) and light saturation point (LSP). And it caused highlight utilization ratio reduced but weak light use efficiency increased. JD28 had higher light use efficiency. Diurnal variation curve of Fv/Fm changed greatly in DS and there was no significant difference between the two species. DS treatments decreased photochemical quenching (qP), PhiPS2 and Fv’/Fm’, while it increased non-photochemical quenching (NPQ). The reduction of PhiPS2 was caused by the decrease of qP and Fv’/Fm’. DS treatments weakened maize leaves’ capability of assimilation, transformation and light energy utilization. JD28 could use more light than JD261 in photosynthesis. While JD261’s light use efficiency was lower, the less light used for photosynthesis and the excessive photon flux energy was dissipated in form of heat. Key words: Elongating stage, maize, drought-tolerance, photosynthesis.
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Claims 17
Claim · model-written summary
Net photosynthesis rate fell with increasing light intensity.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Pn reduced with enhanced light intensity.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought intensified photoinhibition in both genotypes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“DS intensified the extent of photoinhibition.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
JD28 photosynthesis rate was insensitive to high light under drought at elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“for DS at elongating stage, Pn of the cultivar JD28 was insensitive to highlight.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Pmax and Rd decreased under drought.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Pmax and Rd decreased, and physiological activity reduced obviously.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Physiological activity decreased under drought.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Pmax and Rd decreased, and physiological activity reduced obviously.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
JD261 decreased more than JD28.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Compared with JD28, JD261 decreased more.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought lowered light compensation and saturation points.
- Treatment
- DSe0
- Outcome
- light compensation point (LCP) and light saturation point (LSP)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“DS resulted in decreased light compensation point (LCP) and light saturation point (LSP).”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought reduced high-light utilization.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“it caused highlight utilization ratio reduced”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought increased weak-light use efficiency.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“weak light use efficiency increased.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
JD28 had higher light-use efficiency.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“JD28 had higher light use efficiency.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Fv/Fm diurnal curves changed greatly under drought without a significant genotype difference.
- Treatment
- DSe0
- Outcome
- Diurnal variation curve of Fv/Fme0
- Direction
- changed greatlye0
- Comparator
- the two speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“Diurnal variation curve of Fv/Fm changed greatly in DS and there was no significant difference between the two species.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought decreased qP, PhiPS2 and Fv’/Fm’.
- Treatment
- DS treatmentse0
- Outcome
- photochemical quenching (qP), PhiPS2 and Fv’/Fm’e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“DS treatments decreased photochemical quenching (qP), PhiPS2 and Fv’/Fm’”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought increased NPQ.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“it increased non-photochemical quenching (NPQ).”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Reduced PhiPS2 was attributed to reduced qP and Fv’/Fm’.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“The reduction of PhiPS2 was caused by the decrease of qP and Fv’/Fm’.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
Drought weakened leaf assimilation, transformation and light-use capacity.
- Treatment
- DS treatmentse0
- Outcome
- capability of assimilation, transformation and light energy utilizatione0
- Direction
- weakenede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“DS treatments weakened maize leaves’ capability of assimilation, transformation and light energy utilization.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
JD28 used more light for photosynthesis than JD261.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“JD28 could use more light than JD261 in photosynthesis.”
e1“DS intensified the extent of photoinhibition.”
Claim · model-written summary
In JD261, excess photon energy was dissipated as heat.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e0“JD261’s light use efficiency was lower, the less light used for photosynthesis and the excessive photon flux energy was dissipated in form of heat.”
e1“DS intensified the extent of photoinhibition.”
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