Abstract
Raising crops production via improving photosynthesis has always been focused. Recently excavating and increasing the photosynthetic capacity of non-leaf organs becomes an important approach to crops yield increase. Here we studied the photosynthetic characteristics of the flag leaf and the non-leaf organs including the sheath, the glume and the lemma under greenhouse. The relative water content (RWC), the stomatal characteristics, the photosynthetic pigment contents, the enzyme activities in C 3 and C 4 pathway and the malate content of the flag leaf and the non-leaf organs on 7, 14, 21, and 28 days after anthesis (denoted by 7DAA, 14DAA, 21DAA, and 28DAA) were determined under well-watered (CK) and water-stressed (D) treatments. Drought stress significantly reduced the RWC of the flag leaf and the non-leaf organs, while the variation of RWC in the glume and the lemma was lower than in the flag leaf. The chlorophyll a content, the chlorophyll b content, the total chlorophyll content and the xanthophyll content in the flag leaf were significantly decreased under D. However, drought stress significantly increased the photosynthetic pigment contents in the glume at the late stage (21DAA and 28DAA). In addition, the induced activities of PEPC, NADP-MDH, NADP-ME, NAD-ME, and PPDK in non-leaf organs under drought stress suggested that the C 4 photosynthetic pathway in non-leaf organs compensated the limited C 3 photosynthesis in the flag leaf. Non-leaf organs, in particular the glume, showed the crucial function in maintaining the stable photosynthetic performance of oat.
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Claims 7
Claim · model-written summary
Drought reduced relative water content in the flag leaf and non-leaf organs.
- Taxon
- oat
Avena sativat0 - Organ / stage
- flag leaf and the non-leaf organse0
- Treatment
- Drought stresse0
- Outcome
- RWCe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced the RWC of the flag leaf and the non-leaf organs”
t0“oat flag leaf and spike”
Claim · model-written summary
Water content varied less in the glume and lemma than in the flag leaf.
- Taxon
- oatAvena sativat0
- Organ / stage
- glume and the lemmae0
- Outcome
- variation of RWCe0
- Direction
- lowere0
- Comparator
- flag leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variation of RWC in the glume and the lemma was lower than in the flag leaf”
t0“oat flag leaf and spike”
Claim · model-written summary
Drought reduced four photosynthetic pigments in the flag leaf.
- Taxon
- oatAvena sativat0
- Organ / stage
- flag leafe0
- Treatment
- De0
- Outcome
- chlorophyll a content, the chlorophyll b content, the total chlorophyll content and the xanthophyll contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll a content, the chlorophyll b content, the total chlorophyll content and the xanthophyll content in the flag leaf were significantly decreased under D”
t0“oat flag leaf and spike”
Claim · model-written summary
Drought increased photosynthetic pigments in the glume at 21 and 28 days after anthesis.
- Taxon
- oatAvena sativat0
- Organ / stage
- glumee0
- Treatment
- drought stresse0
- Outcome
- photosynthetic pigment contentse0
- Direction
- increasede0
- Qualifier
- late stage (21DAA and 28DAA)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress significantly increased the photosynthetic pigment contents in the glume at the late stage (21DAA and 28DAA)”
t0“oat flag leaf and spike”
Claim · model-written summary
Drought induced C4 pathway enzyme activities in non-leaf organs.
- Taxon
- oatAvena sativat0
- Organ / stage
- non-leaf organse0
- Treatment
- drought stresse0
- Gene
- PEPC, NADP-MDH, NADP-ME, NAD-ME, and PPDKe0
- Outcome
- induced activitiese0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“induced activities of PEPC, NADP-MDH, NADP-ME, NAD-ME, and PPDK in non-leaf organs under drought stress”
t0“oat flag leaf and spike”
Claim · model-written summary
The authors infer non-leaf C4 photosynthesis compensated limited flag leaf C3 photosynthesis.
- Taxon
- oatAvena sativat0
- Organ / stage
- non-leaf organse0
- Outcome
- limited C 3 photosynthesis in the flag leafe0
- Qualifier
- C 4 photosynthetic pathwaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the C 4 photosynthetic pathway in non-leaf organs compensated the limited C 3 photosynthesis in the flag leaf”
t0“oat flag leaf and spike”
Claim · model-written summary
Non-leaf organs, especially the glume, helped maintain oat photosynthetic performance.
- Taxon
- oatAvena sativae0
- Organ / stage
- glumee0
- Outcome
- stable photosynthetic performancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-leaf organs, in particular the glume, showed the crucial function in maintaining the stable photosynthetic performance of oat”
The same questions in other papers
drought · physiology: water · Avena sativa (oats)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- negative
2 papers more in this group
See all 6 papers →drought · physiology: photosynthesis · Avena sativa (oats)Positive and negative results
6 in the opposite direction
- negative
- negative
- negative
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See all 7 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.