Abstract
ABSTRACT In many parts of the world, solar radiation has decreased during the past 50 years due to industrialisation‐induced elevations in air aerosols which has negatively impacted crop productivity. Climate change threatens rapeseed ( Brassica napus L.) production due to shade stress caused by reduced light radiation. However, studies on how shade affects photosynthetic mechanisms in rapeseed (leaves and pod wall) are not well documented. Understanding the mechanisms of shade on yield formation in rapeseed is important for breeding shade‐tolerant rapeseed varieties and optimising agricultural management practices in low‐light areas. Therefore, this study assesses the impacts of ‘global dimming’ simulated by shading at a specific period on rapeseed's photosynthetic behaviour, yield and seed quality. A two‐factor split‐plot design was arranged with three shading treatments (CK, FS and PS) and two hybrid genotypes (Chuannong and Zhongyouza) of rapeseed. We observed that shading at the flowering stage (FS) significantly inhibited the leaf area index, chlorophyll content, photosynthetic efficiency and enzymatic activities of both genotypes. Besides that, shading at pod development stage (PS) substantially declined the pod photosynthetic characteristics and transportation of carbohydrates towards economic organ (seeds) which directly decreased the yield of rapeseed. We found that PS treatment remarkably declined the oil content of both genotypes. According to the results, the photosynthetic capacity of rapeseed pod wall had a greater impact on yield and seed quality than leaves. Therefore, improving the photosynthetic capacity and material transport efficiency of the pod wall is a potential measure to increase the yield of rapeseed under shade stress. This study provides a new insight into the effects of shade on rapeseed production and provides a valuable reference for rapeseed breeding techniques to develop high‐yielding genotypes by enhancing the photosynthetic efficiency of rapeseed pod wall in low‐light conditions.
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Claims 7
Claim · model-written summary
Shading at the flowering stage significantly inhibited leaf area index, chlorophyll content and photosynthetic efficiency in both rapeseed genotypes compared with the CK treatment.
- Taxon
- Brassica napus L.
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- shading at the flowering stage (FS)e0
- Outcome
- leaf area index, chlorophyll content, photosynthetic efficiencye0
- Direction
- inhibitede0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“shading at the flowering stage (FS) significantly inhibited the leaf area index, chlorophyll content, photosynthetic efficiency and enzymatic activities of both genotypes”
e1“three shading treatments (CK, FS and PS)”
t0“Brassica napus L.”
Claim · model-written summary
Shading at the flowering stage significantly inhibited enzymatic activities in both rapeseed genotypes compared with the CK treatment.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- shading at the flowering stage (FS)e0
- Outcome
- enzymatic activitiese0
- Direction
- inhibitede0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shading at the flowering stage (FS) significantly inhibited the leaf area index, chlorophyll content, photosynthetic efficiency and enzymatic activities of both genotypes”
e1“three shading treatments (CK, FS and PS)”
t0“Brassica napus L.”
Claim · model-written summary
Shading at the pod development stage substantially declined pod photosynthetic characteristics and transportation of carbohydrates towards seeds.
- Taxon
- Brassica napus L.Brassica napust0
- Organ / stage
- pode0
- Treatment
- shading at pod development stage (PS)e0
- Outcome
- pod photosynthetic characteristics and transportation of carbohydratese0
- Direction
- declinede0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shading at pod development stage (PS) substantially declined the pod photosynthetic characteristics and transportation of carbohydrates towards economic organ (seeds)”
e1“three shading treatments (CK, FS and PS)”
t0“Brassica napus L.”
Claim · model-written summary
Shading at the pod development stage directly decreased rapeseed yield.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- shading at pod development stage (PS)e0
- Outcome
- yielde1
- Direction
- decreasede1
- Comparator
- CKe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shading at pod development stage (PS) substantially declined”
e1“which directly decreased the yield of rapeseed”
e2“three shading treatments (CK, FS and PS)”
t0“Brassica napus L.”
Claim · model-written summary
The PS shading treatment remarkably declined the oil content of both rapeseed genotypes.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- PS treatmente0
- Outcome
- oil contente0
- Direction
- declinede0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PS treatment remarkably declined the oil content of both genotypes”
e1“three shading treatments (CK, FS and PS)”
t0“Brassica napus L.”
Claim · model-written summary
The photosynthetic capacity of the rapeseed pod wall had a greater impact on yield and seed quality than that of leaves.
- Taxon
- Brassica napus L.Brassica napust0
- Organ / stage
- pod walle0
- Outcome
- yield and seed qualitye0
- Direction
- greatere0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic capacity of rapeseed pod wall had a greater impact on yield and seed quality than leaves”
t0“Brassica napus L.”
Claim · model-written summary
The authors recommend improving the photosynthetic capacity and material transport efficiency of the pod wall as a potential measure to increase rapeseed yield under shade stress.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- improving the photosynthetic capacity and material transport efficiency of the pod walle0
- Outcome
- increase the yield of rapeseede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improving the photosynthetic capacity and material transport efficiency of the pod wall is a potential measure to increase the yield of rapeseed under shade stress”
t0“Brassica napus L.”
The same questions in other papers
stage · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
2 in the opposite direction
- positive
- positive
shade · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
shade · yield · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
2 papers more in this group
See all 6 papers →shade · physiology: enzyme activity · Brassica napus (oilseed rape)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.