Abstract
Rice(Oryza sativa L.) as a photophilous crop,often encounters low-light environment during the growth stage in rice-producing areas particularly in Sichuan.Low-light stress seriously affects the morphology,physiology,grain yield and quality of rice.However,the response of rice root system to low-light stress is not so far clear.Therefore,we seeks to examine the responses of five rice varieties to low-light stress at different growth stages through pot experiments under artificially-controlled shading condition using white cotton yarn screen.By a completely randomized design,the pot experiments were carried out on the experimental farm of Sichuan Agricultural University in 2009.In experiment 1,one-layer and two-layer white cotton yarn screens,which shaded about 53 % and 73 % of the full light intensity respectively,were covered on the top of rice canopy of Gangyou 906 at tillering-elongation stage,elongation-booting stage,booting-heading stage,and heading-maturing stage respectively.In experiment 2,the response of root system of Ⅱ you 498,Gangyou 188,Gangyou 527 and Chuanxiang 9838 to shading was studied at tillering-elongation stage and booting-heading stage by covering with one-layer white cotton yarn screen.The screens were more than 2.0 m above the ground to ensure good ventilation and were large enough to fully cover the shaded plots.Plants without covers were set as control(CK).Root/shoot ratio,root volume,maximal root length,root total absorbing area,root active absorbing area and root α-naphthylamine oxidizing activity were analyzed at the end of shading treatment.The results were as follows: 1) Root volume,root total absorbing area and root active absorbing area of Gangyou 906 were decreased with the increase of shading degree before filling stage,resulting in root growth retard(Fig.1,2).At tillering-elongation stage and elongation-booting stage,shading greatly(P 0.05) reduced root volume,and the decline was severe with the increase of low-light stress.As compared with the control,root volume was significantly decreased(P 0.05),but the decrement with treatment of 53 % shading was greater than that of 73 % shading at booting-heading stage.Root total absorbing area and active absorbing area significantly(P 0.05) decreased with the increase of shading intensity at elongation-booting stage and booting-heading stage.After heading stage,the root system growth was promoted,while the root senescence was delayed under 53 % shading treatment.Meanwhile,the root volume,root total absorbing area and active absorbing area increased by 14.6 %,17.5 % and 39.5 % respectively with 53 % shading treatment.However,73 % shading treatment had negative effects on root volume,root total absorbing area,root active absorbing area and α-naphthylamine oxidizing activity in roots(Fig.1-3).2) The responses of different varieties to shading treatment were different.Shading significantly(P 0.05) reduced root α-naphthylamine oxidizing activity,root absorbing area and active absorbing area of Ⅱyou 498,Gangyou 188 and Gangyou 527(Table 3,4),leading to the hindrance of the formation and capacity of moisture and mineral nutrients of root system.But for Gangyou 906,the root α-naphthylamine oxidizing activity with 53% and 73% shading treatment at tillering-elongation stage and booting-heading stage were 104.7 %,35.5 %,83.2 %,and 0.5 % respectively higher than those of non-shading treatment.It can be concluded that different degrees of shading have different influences on root system characteristics of rice at each growth stage,and strong shade-tolerant variety such as Gangyou 906,can reduce the disadvantaged effect on grain yield of rice by improving the vigor of root system.It also suggests that the root α-naphthylamine oxidizing activity and root active absorbing area can be used as effective indicators to identify the low-light tolerance of rice with the grey correlation degree analysis(Table 5).All these results lay a theoretical foundation for the selection of shade-tolerant variety and the improvement of cultivation technology.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
Root volume, root total absorbing area and root active absorbing area of Gangyou 906 decreased with increasing shading degree before the filling stage.
- Taxon
- Oryza sativa L.
Oryza sativae0 - Material
- Gangyou 906e1
- Treatment
- shading degreee1
- Outcome
- Root volume,root total absorbing area and root active absorbing areae1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“Root volume,root total absorbing area and root active absorbing area of Gangyou 906 were decreased with the increase of shading degree before filling stage”
Claim · model-written summary
At the tillering-elongation and elongation-booting stages, shading greatly reduced root volume, with a larger decline at stronger low-light stress.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- tillering-elongation stage and elongation-booting stagee1
- Treatment
- shadinge1
- Outcome
- root volumee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“At tillering-elongation stage and elongation-booting stage,shading greatly(P 0.05) reduced root volume”
Claim · model-written summary
At the booting-heading stage, root volume was significantly decreased compared with the control.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- booting-heading stagee2
- Outcome
- root volumee1
- Direction
- decreasede1
- Comparator
- controle1
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“As compared with the control,root volume was significantly decreased(P 0.05)”
e2“at booting-heading stage”
Claim · model-written summary
At the booting-heading stage, the decrement in root volume with 53 % shading was greater than with 73 % shading.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- booting-heading stagee1
- Treatment
- 53 % shadinge1
- Outcome
- decremente1
- Direction
- greatere1
- Comparator
- 73 % shadinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“the decrement with treatment of 53 % shading was greater than that of 73 % shading at booting-heading stage”
Claim · model-written summary
Root total absorbing area and active absorbing area significantly decreased with increasing shading intensity at the elongation-booting and booting-heading stages.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- elongation-booting stage and booting-heading stagee1
- Treatment
- shading intensitye1
- Outcome
- Root total absorbing area and active absorbing areae1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“Root total absorbing area and active absorbing area significantly(P 0.05) decreased with the increase of shading intensity at elongation-booting stage and booting-heading stage”
Claim · model-written summary
After heading, 53 % shading promoted root system growth and delayed root senescence.
- Taxon
- Oryza sativa L.Oryza sativae0
- Organ / stage
- After heading stagee1
- Treatment
- 53 % shading treatmente1
- Outcome
- root system growthe1
- Direction
- promotede1
- Qualifier
- root senescence was delayede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“After heading stage,the root system growth was promoted,while the root senescence was delayed under 53 % shading treatment”
Claim · model-written summary
With 53 % shading, root volume increased by 14.6 %.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- 53 % shading treatmente1
- Outcome
- root volumee1
- Direction
- increasede1
- Value
- 14.6 %e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“the root volume,root total absorbing area and active absorbing area increased by 14.6 %,17.5 % and 39.5 % respectively with 53 % shading treatment”
Claim · model-written summary
With 53 % shading, root total absorbing area increased by 17.5 %.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- 53 % shading treatmente1
- Outcome
- root total absorbing areae1
- Direction
- increasede1
- Value
- 17.5 %e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“the root volume,root total absorbing area and active absorbing area increased by 14.6 %,17.5 % and 39.5 % respectively with 53 % shading treatment”
Claim · model-written summary
With 53 % shading, root active absorbing area increased by 39.5 %.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- 53 % shading treatmente1
- Outcome
- active absorbing areae1
- Direction
- increasede1
- Value
- 39.5 %e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“the root volume,root total absorbing area and active absorbing area increased by 14.6 %,17.5 % and 39.5 % respectively with 53 % shading treatment”
Claim · model-written summary
73 % shading had negative effects on root volume, root total absorbing area and root active absorbing area.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- 73 % shading treatmente1
- Outcome
- root volume,root total absorbing area,root active absorbing areae1
- Direction
- negative effectse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“73 % shading treatment had negative effects on root volume,root total absorbing area,root active absorbing area and α-naphthylamine oxidizing activity in roots”
Claim · model-written summary
73 % shading had negative effects on root α-naphthylamine oxidizing activity.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- 73 % shading treatmente1
- Outcome
- α-naphthylamine oxidizing activity in rootse1
- Direction
- negative effectse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“73 % shading treatment had negative effects on root volume,root total absorbing area,root active absorbing area and α-naphthylamine oxidizing activity in roots”
Claim · model-written summary
Shading significantly reduced root α-naphthylamine oxidizing activity, absorbing area and active absorbing area of Ⅱyou 498.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Ⅱyou 498e1
- Treatment
- Shadinge1
- Outcome
- root α-naphthylamine oxidizing activity,root absorbing area and active absorbing areae1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“Shading significantly(P 0.05) reduced root α-naphthylamine oxidizing activity,root absorbing area and active absorbing area of Ⅱyou 498,Gangyou 188 and Gangyou 527”
Claim · model-written summary
Shading significantly reduced root α-naphthylamine oxidizing activity, absorbing area and active absorbing area of Gangyou 188.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 188e1
- Treatment
- Shadinge1
- Outcome
- root α-naphthylamine oxidizing activity,root absorbing area and active absorbing areae1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“Shading significantly(P 0.05) reduced root α-naphthylamine oxidizing activity,root absorbing area and active absorbing area of Ⅱyou 498,Gangyou 188 and Gangyou 527”
Claim · model-written summary
Shading significantly reduced root α-naphthylamine oxidizing activity, absorbing area and active absorbing area of Gangyou 527.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 527e1
- Treatment
- Shadinge1
- Outcome
- root α-naphthylamine oxidizing activity,root absorbing area and active absorbing areae1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“Shading significantly(P 0.05) reduced root α-naphthylamine oxidizing activity,root absorbing area and active absorbing area of Ⅱyou 498,Gangyou 188 and Gangyou 527”
Claim · model-written summary
In Gangyou 906, root α-naphthylamine oxidizing activity under 53% shading at tillering-elongation stage was 104.7 % higher than non-shading.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 906e1
- Organ / stage
- tillering-elongation stagee2
- Treatment
- 53% and 73% shading treatmente2
- Outcome
- root α-naphthylamine oxidizing activitye2
- Direction
- highere2
- Value
- 104.7 %e2
- Comparator
- non-shading treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“But for Gangyou 906”
e2“the root α-naphthylamine oxidizing activity with 53% and 73% shading treatment at tillering-elongation stage and booting-heading stage were 104.7 %,35.5 %,83.2 %,and 0.5 % respectively higher than those of non-shading treatment”
Claim · model-written summary
In Gangyou 906, root α-naphthylamine oxidizing activity under 73% shading at tillering-elongation stage was 35.5 % higher than non-shading.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 906e1
- Organ / stage
- tillering-elongation stagee2
- Treatment
- 53% and 73% shading treatmente2
- Outcome
- root α-naphthylamine oxidizing activitye2
- Direction
- highere2
- Value
- 35.5 %e2
- Comparator
- non-shading treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“But for Gangyou 906”
e2“the root α-naphthylamine oxidizing activity with 53% and 73% shading treatment at tillering-elongation stage and booting-heading stage were 104.7 %,35.5 %,83.2 %,and 0.5 % respectively higher than those of non-shading treatment”
Claim · model-written summary
In Gangyou 906, root α-naphthylamine oxidizing activity under 53% shading at booting-heading stage was 83.2 % higher than non-shading.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 906e1
- Organ / stage
- booting-heading stagee2
- Treatment
- 53% and 73% shading treatmente2
- Outcome
- root α-naphthylamine oxidizing activitye2
- Direction
- highere2
- Value
- 83.2 %e2
- Comparator
- non-shading treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“But for Gangyou 906”
e2“the root α-naphthylamine oxidizing activity with 53% and 73% shading treatment at tillering-elongation stage and booting-heading stage were 104.7 %,35.5 %,83.2 %,and 0.5 % respectively higher than those of non-shading treatment”
Claim · model-written summary
In Gangyou 906, root α-naphthylamine oxidizing activity under 73% shading at booting-heading stage was 0.5 % higher than non-shading.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Gangyou 906e1
- Organ / stage
- booting-heading stagee2
- Treatment
- 53% and 73% shading treatmente2
- Outcome
- root α-naphthylamine oxidizing activitye2
- Direction
- highere2
- Value
- 0.5 %e2
- Comparator
- non-shading treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oryza sativa L.”
e1“But for Gangyou 906”
e2“the root α-naphthylamine oxidizing activity with 53% and 73% shading treatment at tillering-elongation stage and booting-heading stage were 104.7 %,35.5 %,83.2 %,and 0.5 % respectively higher than those of non-shading treatment”
Claim · model-written summary
The authors conclude that the strongly shade-tolerant variety Gangyou 906 can reduce the adverse effect on grain yield by improving root system vigor.
- Taxon
- riceOryza sativae0
- Material
- Gangyou 906e0
- Outcome
- disadvantaged effect on grain yielde0
- Qualifier
- improving the vigor of root systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strong shade-tolerant variety such as Gangyou 906,can reduce the disadvantaged effect on grain yield of rice by improving the vigor of root system”
Claim · model-written summary
The authors suggest that root α-naphthylamine oxidizing activity and root active absorbing area can be used as effective indicators of low-light tolerance in rice.
- Taxon
- riceOryza sativae0
- Outcome
- effective indicators to identify the low-light tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root α-naphthylamine oxidizing activity and root active absorbing area can be used as effective indicators to identify the low-light tolerance of rice”
The same questions in other papers
shade · growth · Oryza sativa (rice)Results differ
9 papers in the same direction as this paper · 26 in the opposite direction
- negative
- negative
- negative
32 papers more in this group
See all 36 papers →shade · molecular: metabolites · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 8 in the opposite direction
- negative
- no effect
- no effect
7 papers more in this group
See all 11 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.