Abstract
The present investigation was carried out at the farm of Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt during 2014, 2015 and 2016 seasons. The evaluation were done based on estimation of heterosis, gene action, heritability, genetic advance and phenotypic correlation coefficient, some root and grain quality traits in rice using six populations technique, viz., P1, P2, F1, BC1, BC2 and F2 generation of three rice crosses namely Sakha 105 x WAB 450-T-B-P 3811-B (cross I); Sakha 104 x IR 66946-3R-178-1-1 (cross II) and Sakha 106 x Sakha 178 (cross III) were raised in a randomized complete block design. Flashing water irrigation was added after 10 days intervals. The current study aimed to determine the heterosis, gene action, heritability, genetic advance and phenotypic correlation response to selection and prediction by the new lines for the traits of days to 50 % heading, plant height, panicle length, number of panicles / plant, number of filled grains/ panicle, 100- grain weight, sterility % and grain yield/ plant. The results obtained from the mean of parents, F1 and F2 generations showed wide range in mean values between the parents and the presence of partial and over-dominance were found for all studied characters. Significant and highly significant positive estimates as a deviation from mid and better parents in all crosses for panicle length, number of panicles/plant and grain yield/plant, also highly significant positive estimates as a deviation from mid and better parents in the first two crosses for plant height. Scaling test provide evidence of non-allelic interaction in controlling all the characters studied in most crosses, the additive gene effect (d) was more important in the genetic system for all studied characters, dominance gene effects (h) and additive x additive gene effects (i) were played an important role in the inheritance of plant height, panicle length, number of filled grains/panicle, 100-grain weight, sterility percentage and grain yield/ plant. The additive x dominance (j) were significant and involved in the inheritance of days to 50% heading, plant height, number of panicles/plant, number of filled grains/panicle, 100-grain weight, sterility percentage and grain yield/plant. However, the dominance x dominance (l) were involved in the genetic control of all characters. Heritability estimates in broad sense were high. Meanwhile, heritability estimates in narrow sense were mostly low. The maximum genetic advance of the mean values was found to be high for number of panicles/plant, plant height and days to 50% heading characters. Highly significant and positive correlation was found for grain yield/plant with panicle length, number of panicles/plant, number of filled grains/panicle and 100-grain weight in all studied crosses. From the foregoing results, Sakha 105 x WAB 450-T-B-P 3811-B (cross I) and Sakha 104 x IR 66946-3R-178-1-1(cross II) could be recommended for growing under water deficit condition to achieve the highest rice grain yield and the highest values of saving water at the same time.
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Claims 13
Claim · model-written summary
All studied rice characters showed partial and over-dominance.
- Taxon
- rice
Oryza sativae1 - Outcome
- partial and over-dominancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial and over-dominance were found for all studied characters”
e1“rice crosses”
Claim · model-written summary
Rice crosses had significant positive heterosis for panicle length, panicle number and grain yield.
- Taxon
- riceOryza sativae1
- Outcome
- panicle length, number of panicles/plant and grain yield/plante0
- Direction
- positivee0
- Comparator
- mid and better parentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant and highly significant positive estimates as a deviation from mid and better parents in all crosses for panicle length, number of panicles/plant and grain yield/plant”
e1“rice crosses”
Claim · model-written summary
The first two rice crosses had highly significant positive heterosis for plant height.
- Taxon
- riceOryza sativae1
- Material
- the first two crossese0
- Outcome
- plant heighte0
- Direction
- positivee0
- Comparator
- mid and better parentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highly significant positive estimates as a deviation from mid and better parents in the first two crosses for plant height”
e1“rice crosses”
Claim · model-written summary
Non-allelic interactions controlled all studied rice characters in most crosses.
- Taxon
- riceOryza sativae1
- Outcome
- non-allelic interactione0
- Qualifier
- most crossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-allelic interaction in controlling all the characters studied in most crosses”
e1“rice crosses”
Claim · model-written summary
Additive gene effects were more important for all studied rice characters.
- Taxon
- riceOryza sativae1
- Outcome
- additive gene effecte0
- Direction
- more importante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the additive gene effect (d) was more important in the genetic system for all studied characters”
e1“rice crosses”
Claim · model-written summary
Dominance and additive-by-additive effects contributed to inheritance of several rice growth and yield traits.
- Taxon
- riceOryza sativae1
- Outcome
- inheritance of plant height, panicle length, number of filled grains/paniclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dominance gene effects (h) and additive x additive gene effects (i) were played an important role in the inheritance of plant height, panicle length, number of filled grains/panicle, 100-grain weight, sterility percentage and grain yield/ plant”
e1“rice crosses”
Claim · model-written summary
Additive-by-dominance effects contributed to inheritance of seven rice traits.
- Taxon
- riceOryza sativae1
- Outcome
- inheritance of days to 50% heading, plant height, number of panicles/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additive x dominance (j) were significant and involved in the inheritance of days to 50% heading, plant height, number of panicles/plant, number of filled grains/panicle, 100-grain weight, sterility percentage and grain yield/plant”
e1“rice crosses”
Claim · model-written summary
Dominance-by-dominance effects controlled all rice characters.
- Taxon
- riceOryza sativae1
- Outcome
- genetic control of all characterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dominance x dominance (l) were involved in the genetic control of all characters”
e1“rice crosses”
Claim · model-written summary
Broad-sense heritability estimates were high in rice.
- Taxon
- riceOryza sativae1
- Outcome
- Heritability estimates in broad sensee0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heritability estimates in broad sense were high”
e1“rice crosses”
Claim · model-written summary
Narrow-sense heritability estimates were mostly low in rice.
- Taxon
- riceOryza sativae1
- Outcome
- heritability estimates in narrow sensee0
- Direction
- mostly lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heritability estimates in narrow sense were mostly low”
e1“rice crosses”
Claim · model-written summary
Genetic advance was high for panicle number, plant height and days to heading.
- Taxon
- riceOryza sativae1
- Outcome
- genetic advancee0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum genetic advance of the mean values was found to be high for number of panicles/plant, plant height and days to 50% heading characters”
e1“rice crosses”
Claim · model-written summary
Grain yield was positively correlated with panicle length, panicle number and filled grains per panicle.
- Taxon
- riceOryza sativae1
- Organ / stage
- paniclee0
- Outcome
- grain yield/plante0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highly significant and positive correlation was found for grain yield/plant with panicle length, number of panicles/plant, number of filled grains/panicle and 100-grain weight in all studied crosses”
e1“rice crosses”
Claim · model-written summary
The authors recommend crosses I and II for water-deficit rice production and water saving.
- Taxon
- riceOryza sativae0
- Outcome
- growing under water deficit conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sakha 105 x WAB 450-T-B-P 3811-B (cross I) and Sakha 104 x IR 66946-3R-178-1-1(cross II) could be recommended for growing under water deficit condition to achieve the highest rice grain yield and the highest values of saving water at the same time”