Abstract
Drought stress due to water deficit is a major problem of rice cultivation as a most drought-sensitive crop plant. A rice mutant line (MT58) was developed after mutagenesis of cv. Neda by ethyl methane sulfonate (EMS) and selected for dwarfism (18 cm shorter than Neda). The extent of its molecular changes relative to parental cultivar was assessed by SSR and ISSR markers, and the response of the line along with parental cultivar and another mutant line (MTA) to mild and severe water deficit, was evaluated in a field experiment. A molecular assessment using 41 SSR markers showed that dwarf line MT58 had significant molecular difference with two other lines. ISSR assay also proved the considerable mutational effect of EMS on two mutant lines compared with the original wild line. Field experiments revealed that limited irrigation caused mild-to-severe decrease in all the studied traits, including chlorophyll contents. In mild water-stress mutant line, MT58 showed a low (3 %) yield loss as compared with cultivar Neda with a high (14 %) yield loss. Interestingly, in severe water-stress mutant line, MT58 showed a low (19 %) yield loss as compared with mutant line MTA and cv. Neda with high (33 and 31 %, respectively) yield loss. In severe stress, mutant MT58 had the highest values of panicle length, total kernels per panicle, fertile kernels, and chlorophyll contents, while cv. Neda had the highest values of plant height, tiller number, and plant yield, and reduction in chlorophyll content at drought stress condition was correlated with yield loss (0.64 and 0.697 for chl.a and chl.b, respectively). The results of this research obviously confirm that mutant line MT58 despite of its stunt figure shows a low yield loss due to drought stress and hence is a promising line for cultivation under drought condition.
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Claims 15
Claim · model-written summary
MT58 was 18 cm shorter than Neda.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selected for dwarfism (18 cm shorter than Neda)”
t0“rice”
Claim · model-written summary
SSR markers showed significant molecular differences between MT58 and the two other lines.
- Taxon
- rice
Oryza sativat0 - Material
- MT58e0
- Outcome
- molecular differencee0
- Comparator
- two other linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dwarf line MT58 had significant molecular difference with two other lines”
t0“rice”
Claim · model-written summary
ISSR assays found considerable mutational effects in the two mutant lines relative to the original line.
- Taxon
- riceOryza sativat0
- Treatment
- EMSe0
- Outcome
- considerable mutational effecte0
- Comparator
- original wild linee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ISSR assay also proved the considerable mutational effect of EMS on two mutant lines compared with the original wild line”
t0“rice”
Claim · model-written summary
Limited irrigation decreased all studied traits, including chlorophyll content.
- Taxon
- riceOryza sativat0
- Treatment
- limited irrigatione0
- Outcome
- all the studied traits, including chlorophyll contentse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limited irrigation caused mild-to-severe decrease in all the studied traits, including chlorophyll contents”
t0“rice”
Claim · model-written summary
Under mild water stress, MT58 lost 3 % of yield.
- Taxon
- riceOryza sativat0
- Material
- MT58e0
- Outcome
- yield losse0
- Direction
- lowe0
- Value
- 3 %e0
- Comparator
- cultivar Nedae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MT58 showed a low (3 %) yield loss as compared with cultivar Neda with a high (14 %) yield loss”
t0“rice”
Claim · model-written summary
Under mild water stress, Neda lost 14 % of yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MT58 showed a low (3 %) yield loss as compared with cultivar Neda with a high (14 %) yield loss”
t0“rice”
Claim · model-written summary
Under severe stress, MT58 lost 19 % of yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MT58 showed a low (19 %) yield loss as compared with mutant line MTA and cv. Neda with high (33 and 31 %, respectively) yield loss”
t0“rice”
Claim · model-written summary
Under severe stress, MTA lost 33 % of yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mutant line MTA and cv. Neda with high (33 and 31 %, respectively) yield loss”
t0“rice”
Claim · model-written summary
Under severe stress, Neda lost 31 % of yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mutant line MTA and cv. Neda with high (33 and 31 %, respectively) yield loss”
t0“rice”
Claim · model-written summary
Under severe stress MT58 had the highest panicle length, kernels per panicle and fertile kernels.
- Taxon
- riceOryza sativat0
- Material
- MT58e0
- Outcome
- panicle length, total kernels per panicle, fertile kernelse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mutant MT58 had the highest values of panicle length, total kernels per panicle, fertile kernels, and chlorophyll contents”
t0“rice”
Claim · model-written summary
Under severe stress MT58 had the highest chlorophyll content.
- Taxon
- riceOryza sativat0
- Material
- MT58e0
- Outcome
- chlorophyll contentse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mutant MT58 had the highest values of panicle length, total kernels per panicle, fertile kernels, and chlorophyll contents”
t0“rice”
Claim · model-written summary
Under severe stress Neda had the highest height, tiller number and yield.
- Taxon
- riceOryza sativat0
- Material
- Nedae0
- Outcome
- plant height, tiller number, and plant yielde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cv. Neda had the highest values of plant height, tiller number, and plant yield”
t0“rice”
Claim · model-written summary
Drought-related chlorophyll a reduction correlated with yield loss at 0.64.
- Taxon
- riceOryza sativat0
- Treatment
- drought stress conditione0
- Outcome
- yield losse0
- Value
- 0.64e0
- Qualifier
- chl.ae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in chlorophyll content at drought stress condition was correlated with yield loss (0.64 and 0.697 for chl.a and chl.b, respectively)”
t0“rice”
Claim · model-written summary
Drought-related chlorophyll b reduction correlated with yield loss at 0.697.
- Taxon
- riceOryza sativat0
- Treatment
- drought stress conditione0
- Outcome
- yield losse0
- Value
- 0.697e0
- Qualifier
- chl.be0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in chlorophyll content at drought stress condition was correlated with yield loss (0.64 and 0.697 for chl.a and chl.b, respectively)”
t0“rice”
Claim · model-written summary
The authors consider MT58 promising for cultivation under drought.
- Taxon
- riceOryza sativat0
- Material
- MT58e0
- Outcome
- promising line for cultivation under drought conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mutant line MT58 despite of its stunt figure shows a low yield loss due to drought stress and hence is a promising line for cultivation under drought condition”
t0“rice”
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See all 29 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.