Abstract
Knowledge of tree biomass allocation is fundamental for estimating forest acclimation and carbon stock for global changes in the future. Optimal partitioning theory (OPT) and allometric partitioning theory (APT) are two major patterns of biomass allocation, and occurrences have been tested on taxonomical, ontogenetic, geographic and environmental scales, showing conflicting results and unclear ecophysiological mechanisms. Here, we examine the biomass allocation patterns of two young poplar (Populus) clones varying greatly in drought resistance under different soil water and nitrogen availabilities and the major physiological processes involved in biomass partitioning. We found that Biyu, a drought-sensitive hybrid poplar clone, had significant relations among biomass of leaf, stem and root, showing allometric partitioning. Xiaoye, a drought-tolerant poplar clone native to semi-arid areas, on the contrary, showed tightly regulated biomass allocation following optimal partitioning theory. Biyu had higher nitrate reductase activity in the fine roots, while Xiaoye had higher nitrate reductase activity in the leaves. Biochemical analyses and measurements of fluorescence and gas exchange showed that Xiaoye maintained more stable chloroplast membranes and photosystem electron flow, showing higher water use efficiency and a higher resistance to drought. A nitrogen addition could improve leaf photosynthesis and growth both in Biyu and Xiaoye seedlings under drought conditions. We concluded that the two poplar clones showed different biomass allocation patterns and suggest that the site of nitrate assimilation may play a role in biomass partitioning under varying water and nitrogen availabilities.
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Claims 10
Claim · model-written summary
Biyu, a drought-sensitive hybrid poplar clone, had significant relations among biomass of leaf, stem and root, showing allometric partitioning.
- Material
- Biyue1
- Organ / stage
- leaf, stem and roote1
- Outcome
- biomass of leaf, stem and roote1
- Qualifier
- allometric partitioninge1
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found that Biyu, a drought-sensitive hybrid poplar clone, had significant relations among biomass of leaf, stem and root, showing allometric partitioning”
Claim · model-written summary
Xiaoye, a drought-tolerant poplar clone native to semi-arid areas, showed tightly regulated biomass allocation following optimal partitioning theory.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Xiaoye, a drought-tolerant poplar clone native to semi-arid areas, on the contrary, showed tightly regulated biomass allocation following optimal partitioning theory”
Claim · model-written summary
Biyu had higher nitrate reductase activity in the fine roots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Biyu had higher nitrate reductase activity in the fine roots”
e2“two young poplar (Populus) clones”
Claim · model-written summary
Xiaoye had higher nitrate reductase activity in the leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Xiaoye had higher nitrate reductase activity in the leaves”
e2“two young poplar (Populus) clones”
Claim · model-written summary
Xiaoye maintained more stable chloroplast membranes and photosystem electron flow.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Xiaoye maintained more stable chloroplast membranes and photosystem electron flow”
e2“two young poplar (Populus) clones”
Claim · model-written summary
Xiaoye showed higher water use efficiency.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Xiaoye maintained more stable chloroplast membranes and photosystem electron flow, showing higher water use efficiency and a higher resistance to drought”
e2“two young poplar (Populus) clones”
Claim · model-written summary
Xiaoye showed higher resistance to drought.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Xiaoye maintained more stable chloroplast membranes and photosystem electron flow, showing higher water use efficiency and a higher resistance to drought”
e2“two young poplar (Populus) clones”
Claim · model-written summary
A nitrogen addition could improve leaf photosynthesis and growth in Biyu seedlings under drought.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A nitrogen addition could improve leaf photosynthesis and growth both in Biyu and Xiaoye seedlings under drought conditions”
e2“two young poplar (Populus) clones”
Claim · model-written summary
A nitrogen addition could improve leaf photosynthesis and growth in Xiaoye seedlings under drought.
- Material
- Xiaoyee1
- Treatment
- nitrogen additione1
- Outcome
- leaf photosynthesis and growthe1
- Direction
- improvee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A nitrogen addition could improve leaf photosynthesis and growth both in Biyu and Xiaoye seedlings under drought conditions”
e2“two young poplar (Populus) clones”
Claim · model-written summary
The site of nitrate assimilation may play a role in biomass partitioning under varying water and nitrogen availabilities.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“suggest that the site of nitrate assimilation may play a role in biomass partitioning under varying water and nitrogen availabilities”
e2“two young poplar (Populus) clones”
The same questions in other papers
nitrogen · physiology: photosynthesis · Populus (poplar)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.