Abstract
Soil moisture fluctuations (i.e. transient waterlogged to drought) frequently occur in rainfed rice fields due to erratic rainfall pattern, and irrigated fields due to wetting and drying system practices and inefficient irrigation system. Such conditions are stressful for growth and development of rice. With the utilization of chromosome segment substitution line (CSSL), we previously demonstrated the significant roles of root plasticity as expressed by higher lateral root production in response to soil moisture fluctuation stress. Moreover, our molecular mapping analysis showed the presence of QTL that is associated with root plasticity, at short arm of chromosome 12 region. This QTL was found to control the productions of L-type lateral roots with the increase effect from Kasalath allele. In this study, we attempted to quantify the significant functions of QTL (qLLRn-12) on chromosome 12 in relation to the shoot dry matter productions and root system development. CSSL genotypes with QTL or substituted segment of Kasalath allele on chromosome 12 were evaluated and subjected to 38 days of transient soil moisture fluctuation stress. Results revealed that CSSL genotype with qLLRn-12 showed greater root system development as expressed its greater total root length than those without qLLRn-12 in response to moisture fluctuation stress. Longer total root length was attributed to higher production of L-type lateral roots, which can effectively maintain water and nutrient uptake in the soil. Such plastic root responses resulted in increased stomatal conductance and photosynthesis, eventually increased shoot dry matter production by 37% compared to its Nipponbare parent. Comparison of the location of the QTL across rice cultivars showed that there is no QTL reported in this region related to lateral root production. This may possibly be a putative QTL and potentially be used in the marker-aided breeding program to improve adaptation under fluctuating soil moisture environment.
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Claims 7
Claim · model-written summary
The qLLRn-12 CSSL developed greater total root length under moisture fluctuation stress than the line without it.
- Taxon
- rice
Oryza sativat0 - Material
- CSSL genotypee0
- Treatment
- moisture fluctuation stresse0
- Gene
- qLLRn-12e0
- Outcome
- total root lengthe0
- Direction
- greatere0
- Comparator
- those without qLLRn-12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“CSSL genotype with qLLRn-12 showed greater root system development as expressed its greater total root length than those without qLLRn-12 in response to moisture fluctuation stress”
Claim · model-written summary
Higher L-type lateral root production accounted for longer total root length.
- Taxon
- riceOryza sativat0
- Organ / stage
- L-type lateral rootse0
- Outcome
- total root lengthe0
- Direction
- Longere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Longer total root length was attributed to higher production of L-type lateral roots”
Claim · model-written summary
Root plasticity was interpreted as maintaining soil water and nutrient uptake.
- Taxon
- riceOryza sativat0
- Organ / stage
- L-type lateral rootse1
- Outcome
- water and nutrient uptakee0
- Direction
- maintaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“which can effectively maintain water and nutrient uptake in the soil”
e1“higher production of L-type lateral roots”
Claim · model-written summary
Plastic root responses increased stomatal conductance and photosynthesis.
- Taxon
- riceOryza sativat0
- Outcome
- stomatal conductance and photosynthesise0
- Direction
- increasede0
- Qualifier
- plastic root responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Such plastic root responses resulted in increased stomatal conductance and photosynthesis”
Claim · model-written summary
The CSSL increased shoot dry matter production by 37% versus Nipponbare.
- Taxon
- riceOryza sativat0
- Material
- CSSL genotypee1
- Gene
- qLLRn-12e1
- Outcome
- shoot dry matter productione0
- Direction
- increasede0
- Value
- 37%e0
- Comparator
- Nipponbare parente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“increased shoot dry matter production by 37% compared to its Nipponbare parent”
e1“CSSL genotype with qLLRn-12”
Claim · model-written summary
No other reported rice QTL in that region was related to lateral root production.
- Taxon
- riceOryza sativat0
- Outcome
- no QTL reported in this region related to lateral root productione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no QTL reported in this region related to lateral root production”
t0“rice”
Claim · model-written summary
The authors propose using this putative QTL in marker-aided breeding for adaptation to fluctuating soil moisture.
- Taxon
- riceOryza sativat0
- Outcome
- used in the marker-aided breeding program to improve adaptation under fluctuating soil moisture environmente0
- Qualifier
- may possiblye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This may possibly be a putative QTL and potentially be used in the marker-aided breeding program to improve adaptation under fluctuating soil moisture environment”
t0“rice”