Abstract
The present investigation was carried out at the Farm of the Rice Research and TrainingCenter, Sakha, Kafr El Sheikh Egypt during rice growing seasons 2006 and 2007. Dry seeds of the four rice varieties namely; Sakha 101, Sakha 102, Sakha 104, and Egyptian Yasmine were irradiated with 100, 200 and 400 Gy gamma rays. The seeds of the different treatments in addition to the parental varieties (as control) were grown and transplanted individually in a randomized complete block design with three replications for each treatments along with the control to study the response of different rice varieties to different doses of Gamma rays for some agronomic characters, grain yield and its components and to select some useful mutants carrying desirable characters from different populations in M2 generation such as earliness, short stature, resistance to blast, and high yielding ability. The results of the M1 generation indicated that in general, germination percentage decreased and the reduction was significant for the Sakha 101cv, while number of days to heading, plant height and panicle length were decreased by increasing the doses of Gamma rays for most of the studied varieties. On the other hand, the mean values of number of panicles per plant were increased by increasing the dose of gamma rays for the Sakha 101, Sakha 102 cvs. The spikelet sterility increased with the increase in the dose of gamma rays for all studied varieties and therefore, grain yield per plant was decreased. In the M2 generation, increasing the dose of gamma rays decreased germination %, and plant height for the two rice varieties; Sakha 102, and Egyptian Jasmine. The mean values of number of panicles per plant were increased for the Sakha 101, 102 and Sakha 104 cvs, while it decreased with Egyptian Yasmine. One hundred grain weight was decreased for Sakha 102, Sakha 104 and Egyptian Yasmine, while the Sakha101variety was not affected by gamma rays for this trait. Panicle length and chlorophyll content was increased by the dose of gamma rays for the three varieties; Sakha 101, Sakha 104, and Egyptian Yasmine. Sterility % was increased and the highest increase was observed for the indica rice variety Egyptian Jasmine and therefore, grain yield per plant was decreased for these varieties. Wide ranges of variability were detected in M2 irradiated populations of all varieties for most of the characters studied comparing with the controls, indicating the possibility of selecting mutants with desirable traits to be tested in subsequent generations. The genetic parameters of studied characters for both control and M2 irradiated populations of all varieties indicated that, in most cases, there were considerable increases by irradiation for both phenotypic and genotypic variances, genetic coefficient of variation, heritability as well as expected genetic advance.
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Claims 15
Claim · model-written summary
M1 germination declined, significantly for Sakha 101.
- Taxon
- rice
Oryza sativat0 - Material
- Sakha 101cve0
- Outcome
- germination percentagee0
- Direction
- decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germination percentage decreased and the reduction was significant for the Sakha 101cv”
t0“RICE”
Claim · model-written summary
Increasing gamma ray dose reduced M1 days to heading, plant height and panicle length for most varieties.
- Taxon
- riceOryza sativat0
- Treatment
- increasing the doses of Gamma rayse0
- Outcome
- number of days to heading, plant height and panicle lengthe0
- Direction
- decreasede0
- Qualifier
- most of the studied varietiese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of days to heading, plant height and panicle length were decreased by increasing the doses of Gamma rays for most of the studied varieties”
t0“RICE”
Claim · model-written summary
Increasing gamma ray dose raised M1 panicles per plant in Sakha 101 and Sakha 102.
- Taxon
- riceOryza sativat0
- Material
- Sakha 101, Sakha 102 cvse0
- Treatment
- increasing the dose of gamma rayse0
- Outcome
- number of panicles per plante0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of panicles per plant were increased by increasing the dose of gamma rays for the Sakha 101, Sakha 102 cvs”
t0“RICE”
Claim · model-written summary
Spikelet sterility increased with gamma ray dose in all varieties.
- Taxon
- riceOryza sativat0
- Treatment
- increase in the dose of gamma rayse0
- Outcome
- spikelet sterilitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spikelet sterility increased with the increase in the dose of gamma rays for all studied varieties”
t0“RICE”
Claim · model-written summary
Grain yield per plant decreased with increased sterility.
- Taxon
- riceOryza sativat0
- Outcome
- grain yield per plante0
- Direction
- decreasede0
- Qualifier
- thereforee0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The spikelet sterility increased with the increase in the dose of gamma rays for all studied varieties and therefore, grain yield per plant was decreased.”
t0“RICE”
Claim · model-written summary
In M2, higher gamma doses reduced germination and plant height in Sakha 102 and Egyptian Jasmine.
- Taxon
- riceOryza sativat0
- Material
- Sakha 102, and Egyptian Jasminee0
- Treatment
- increasing the dose of gamma rayse0
- Outcome
- germination %, and plant heighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the dose of gamma rays decreased germination %, and plant height for the two rice varieties; Sakha 102, and Egyptian Jasmine”
t0“RICE”
Claim · model-written summary
M2 panicles per plant increased in Sakha 101, 102 and Sakha 104.
- Taxon
- riceOryza sativat0
- Material
- Sakha 101, 102 and Sakha 104 cvse0
- Outcome
- number of panicles per plante0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“number of panicles per plant were increased for the Sakha 101, 102 and Sakha 104 cvs”
t0“RICE”
Claim · model-written summary
M2 panicles per plant decreased in Egyptian Yasmine.
- Taxon
- riceOryza sativat0
- Material
- Egyptian Yasminee0
- Outcome
- it decreasede0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while it decreased with Egyptian Yasmine”
t0“RICE”
Claim · model-written summary
Hundred grain weight fell in Sakha 102, Sakha 104 and Egyptian Yasmine.
- Taxon
- riceOryza sativat0
- Material
- Sakha 102, Sakha 104 and Egyptian Yasminee0
- Outcome
- One hundred grain weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One hundred grain weight was decreased for Sakha 102, Sakha 104 and Egyptian Yasmine”
t0“RICE”
Claim · model-written summary
Hundred grain weight was unaffected in Sakha 101.
- Taxon
- riceOryza sativat0
- Material
- Sakha101varietye0
- Treatment
- gamma rayse0
- Outcome
- this traite0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sakha101variety was not affected by gamma rays for this trait”
t0“RICE”
Claim · model-written summary
Gamma rays increased panicle length and chlorophyll content in three varieties.
- Taxon
- riceOryza sativat0
- Material
- Sakha 101, Sakha 104, and Egyptian Yasminee0
- Treatment
- dose of gamma rayse0
- Outcome
- Panicle length and chlorophyll contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Panicle length and chlorophyll content was increased by the dose of gamma rays for the three varieties; Sakha 101, Sakha 104, and Egyptian Yasmine”
t0“RICE”
Claim · model-written summary
M2 sterility increased most in Egyptian Jasmine.
- Taxon
- riceOryza sativae0
- Material
- Egyptian Jasminee0
- Outcome
- Sterility %e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sterility % was increased and the highest increase was observed for the indica rice variety Egyptian Jasmine”
t0“RICE”
Claim · model-written summary
M2 grain yield per plant declined.
- Taxon
- riceOryza sativat0
- Outcome
- grain yield per plante0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield per plant was decreased for these varieties”
t0“RICE”
Claim · model-written summary
Irradiated M2 populations showed wider variability than controls.
- Taxon
- riceOryza sativat0
- Outcome
- Wide ranges of variabilitye0
- Direction
- Wide rangese0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wide ranges of variability were detected in M2 irradiated populations of all varieties for most of the characters studied comparing with the controls”
t0“RICE”
Claim · model-written summary
Irradiation raised phenotypic and genotypic variances, genetic variation, heritability and expected advance in most cases.
- Taxon
- riceOryza sativat0
- Treatment
- irradiatione0
- Outcome
- phenotypic and genotypic variances, genetic coefficient of variation, heritabilitye0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“considerable increases by irradiation for both phenotypic and genotypic variances, genetic coefficient of variation, heritability as well as expected genetic advance”
t0“RICE”
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