Abstract
Nowadays, the root characteristics as one of secondary traits along with grain yield are used to response evaluation of rice genotypes under deficit irrigation. Thus, to evaluate the root traits of 40 irrigated rice genotypes to water limited condition a pot experiment was performed in 2014 at Rice Research Institute (Rasht), Iran. Irrigation treatment was applied in two levels include control (traditional irrigation) and deficit irrigation (withholding irrigation at the booting stage). The results showed that deficit irrigation reduced root length from closely 45 to 28 cm, root area from 190 to 117 cm 2 and root area density from closely 6 to 4 cm 2 cm -3 . Under deficit irrigation, average of paddy yield and panicle weight decreased 25% and 18.5%, respectively. In this condition, root dry weight decreased, in other hand the shoot dry weight increased from 42.7 to 49.4 g. Genotypes classification carried out based on studied traits by the Ward's Minimum Variance test in both conditions (control and deficit irrigation) that separated the genotypes into four and three groups, respectively. In both situations, groups with lower amount for root traits had the higher paddy yield. Accordingly in deficit irrigation conditions, group III include 19 genotypes such as Gohar, Shiroudi and Khazar with low amount for root characteristics, had paddy yield higher than other groups. Comparison of groups showed that significant variation of root dry weight, shoot dry weight, panicle weight and paddy yield (about +21, +14, -19 and -14%, respectively) in local genotypes compare with improved genotypes. Therefore, it seems that although priorities of crop improvement in studied genotypes were to allocate more dry matter from the root to the shoot, but considerable diversity existed in terms of dry matter partitioning to different organs under deficit irrigation.
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Claims 15
Claim · model-written summary
Deficit irrigation reduced root length from about 45 to 28 cm.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativat0 - Treatment
- deficit irrigatione0
- Outcome
- root lengthe0
- Direction
- reducede0
- Value
- 45 to 28 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deficit irrigation reduced root length from closely 45 to 28 cm”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Deficit irrigation reduced root area from 190 to 117 cm 2.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- deficit irrigatione0
- Outcome
- root areae0
- Direction
- reducede0
- Value
- 190 to 117 cm 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deficit irrigation reduced root length from closely 45 to 28 cm, root area from 190 to 117 cm 2”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Deficit irrigation reduced root area density from about 6 to 4 cm 2 cm -3.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- deficit irrigatione0
- Outcome
- root area densitye0
- Direction
- reducede0
- Value
- 6 to 4 cm 2 cm -3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deficit irrigation reduced root length from closely 45 to 28 cm, root area from 190 to 117 cm 2 and root area density from closely 6 to 4 cm 2 cm -3”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Deficit irrigation decreased paddy yield by 25%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- deficit irrigatione0
- Outcome
- paddy yielde0
- Direction
- decreasede0
- Value
- 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under deficit irrigation, average of paddy yield and panicle weight decreased 25% and 18.5%, respectively”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Deficit irrigation decreased panicle weight by 18.5%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- deficit irrigatione0
- Outcome
- panicle weighte0
- Direction
- decreasede0
- Value
- 18.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under deficit irrigation, average of paddy yield and panicle weight decreased 25% and 18.5%, respectively”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Root dry weight decreased under deficit irrigation.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Outcome
- root dry weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In this condition, root dry weight decreased”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Shoot dry weight increased from 42.7 to 49.4 g.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Outcome
- shoot dry weighte0
- Direction
- increasede0
- Value
- 42.7 to 49.4 ge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot dry weight increased from 42.7 to 49.4 g”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Ward clustering separated control and deficit-irrigated genotypes into four and three groups, respectively.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Outcome
- genotypese0
- Value
- four and three groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“separated the genotypes into four and three groups, respectively”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Groups with lower root traits had higher paddy yield.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Organ / stage
- roote0
- Outcome
- paddy yielde0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“groups with lower amount for root traits had the higher paddy yield”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Under deficit irrigation, group III had higher paddy yield than other groups.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- group IIIe0
- Outcome
- paddy yielde0
- Direction
- highere0
- Value
- 19 genotypese0
- Comparator
- other groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“group III include 19 genotypes such as Gohar, Shiroudi and Khazar with low amount for root characteristics, had paddy yield higher than other groups”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Local genotypes differed significantly in root dry weight by about +21%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- local genotypese0
- Outcome
- root dry weighte0
- Value
- +21e0
- Comparator
- improved genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant variation of root dry weight, shoot dry weight, panicle weight and paddy yield (about +21, +14, -19 and -14%, respectively) in local genotypes compare with improved genotypes”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Local genotypes differed significantly in shoot dry weight by about +14%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- local genotypese0
- Outcome
- shoot dry weighte0
- Value
- +14e0
- Comparator
- improved genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant variation of root dry weight, shoot dry weight, panicle weight and paddy yield (about +21, +14, -19 and -14%, respectively) in local genotypes compare with improved genotypes”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Local genotypes differed significantly in panicle weight by about -19%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- local genotypese0
- Outcome
- panicle weighte0
- Value
- -19e0
- Comparator
- improved genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant variation of root dry weight, shoot dry weight, panicle weight and paddy yield (about +21, +14, -19 and -14%, respectively) in local genotypes compare with improved genotypes”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Local genotypes differed significantly in paddy yield by about -14%.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Material
- local genotypese0
- Outcome
- paddy yielde0
- Value
- -14%e0
- Comparator
- improved genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant variation of root dry weight, shoot dry weight, panicle weight and paddy yield (about +21, +14, -19 and -14%, respectively) in local genotypes compare with improved genotypes”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Dry matter partitioning retained considerable diversity under deficit irrigation.
- Taxon
- Rice (Oryza sativa L.)Oryza sativat0
- Treatment
- deficit irrigatione0
- Outcome
- dry matter partitioninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“considerable diversity existed in terms of dry matter partitioning to different organs under deficit irrigation”
t0“Rice (Oryza sativa L.)”
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