Abstract
The high heterosis displayed by hybrid rice might be exploitable for the enhancement of rice productivity in the presence of economically-important stresses such as drought and salinity. The current study aimed to find out the possibility of exploring hybrid rice under drought and salinity stresses. Rice varieties, Giza 177 and Giza 178 (inbred rice varieties) and SK2034H (the first hybrid rice released in Egypt) were tested under normal, saline and drought conditions using a split plot design with four replications. The investigation conducted under a controlled system in the greenhouse and field(Farm) of Rice Research and TrainingCenter, Sakha, Kafr EL-Sheikh as well as at El-Sirw Agriculture Research Station i.e. saline soils, Egypt during two growing seasons of 2010 and 2011 in greenhouse and in 2011 under field conditions. The three rice varieties varied significantly in all estimated parameters and in their stress tolerance. The hybrid variety SK2034H was more tolerant to salinity and drought than Giza 178, the most tolerant Egyptian inbred rice varieties. This high capability of the Egyptian-developed hybrid might be mainly attributed to its greater root vigor, leaf area, flag leaf area, chlorophyll content, dry matter production, filled grains number, panicle number and weight; and lower sterility percent (sterility%). Furthermore, SK2034H had higher Na+ and K+ content than Giza 178, leading to a resulting in improved tolerance to stress. On the other hand, Giza 177 was more stress sensitive, possibly due to weakness of root system, poor growth, chlorophyll degradation, high Na/K ratio, and high sterility both stresses. The result obtained from saline soil and drought tested under field conditions came to confirm the obtained one under green house. Interestingly, both SK2034H and Giza 178 were at the same level for salinity tolerance, while SK2034H was more drought tolerant than Giza 178. stress. From the aforementioned results, SK2034H could be used on large scale especially under salt affected areas and in the end tail of irrigation canal.
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Claims 10
Claim · model-written summary
SK2034H was more tolerant to salinity and drought than Giza 178 under stress.
- Taxon
- rice
Oryza sativae1 - Material
- SK2034He1
- Treatment
- salinity and droughte1
- Outcome
- tolerancee2
- Direction
- more tolerante1
- Comparator
- Giza 178e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The hybrid variety SK2034H was more tolerant to salinity and drought than Giza 178, the most tolerant Egyptian inbred rice varieties”
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
Claim · model-written summary
SK2034H and Giza 178 were at the same level for salinity tolerance.
- Taxon
- riceOryza sativae2
- Material
- SK2034He3
- Treatment
- salinitye3
- Outcome
- salinity tolerancee3
- Direction
- same levele3
- Comparator
- Giza 178e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e3“Interestingly, both SK2034H and Giza 178 were at the same level for salinity tolerance, while SK2034H was more drought tolerant than Giza 178”
Claim · model-written summary
SK2034H was more drought tolerant than Giza 178.
- Taxon
- riceOryza sativae2
- Material
- SK2034He3
- Treatment
- droughte3
- Outcome
- drought tolerante3
- Direction
- more drought tolerante3
- Comparator
- Giza 178e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e3“Interestingly, both SK2034H and Giza 178 were at the same level for salinity tolerance, while SK2034H was more drought tolerant than Giza 178”
Claim · model-written summary
SK2034H has greater root vigor, leaf area and flag leaf area.
- Taxon
- riceOryza sativae2
- Outcome
- root vigor, leaf area, flag leaf areae7
- Direction
- greatere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e7“greater root vigor, leaf area, flag leaf area, chlorophyll content, dry matter production, filled grains number, panicle number and weight; and lower sterility percent”
Claim · model-written summary
SK2034H has greater chlorophyll content, dry matter production and filled grains number.
- Taxon
- riceOryza sativae2
- Outcome
- chlorophyll content, dry matter production, filled grains numbere7
- Direction
- greatere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e7“greater root vigor, leaf area, flag leaf area, chlorophyll content, dry matter production, filled grains number, panicle number and weight; and lower sterility percent”
Claim · model-written summary
SK2034H has greater panicle number and weight.
- Taxon
- riceOryza sativae2
- Outcome
- panicle number and weighte7
- Direction
- greatere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e7“greater root vigor, leaf area, flag leaf area, chlorophyll content, dry matter production, filled grains number, panicle number and weight; and lower sterility percent”
Claim · model-written summary
SK2034H has lower sterility percent.
- Taxon
- riceOryza sativae2
- Outcome
- sterility percente7
- Direction
- lowere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e7“greater root vigor, leaf area, flag leaf area, chlorophyll content, dry matter production, filled grains number, panicle number and weight; and lower sterility percent”
Claim · model-written summary
SK2034H had higher Na+ and K+ content than Giza 178.
- Taxon
- riceOryza sativae2
- Material
- SK2034He4
- Outcome
- Na+ and K+ contente4
- Direction
- highere4
- Comparator
- Giza 178e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e4“SK2034H had higher Na+ and K+ content than Giza 178”
Claim · model-written summary
Giza 177 was more stress sensitive than the other varieties.
- Taxon
- riceOryza sativae2
- Material
- Giza 177e5
- Outcome
- stress sensitivee5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e5“Giza 177 was more stress sensitive”
Claim · model-written summary
The authors recommend that SK2034H could be used on large scale, especially in salt-affected areas.
- Taxon
- riceOryza sativae2
- Material
- SK2034He6
- Outcome
- used on large scalee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The three rice varieties varied significantly in all estimated parameters and in their stress tolerance”
e6“SK2034H could be used on large scale especially under salt affected areas”
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See all 27 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.