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Plant Physiological, Morphological and Yield-Related Responses to Night Temperature Changes across Different Species and Plant Functional Types

View Article: PubMed Central - PubMed

ABSTRACT

Land surface temperature over the past decades has shown a faster warming trend during the night than during the day. Extremely low night temperatures have occurred frequently due to the influence of land-sea thermal difference, topography and climate change. This asymmetric night temperature change is expected to affect plant ecophysiology and growth, as the plant carbon consumption processes could be affected more than the assimilation processes because photosynthesis in most plants occurs during the daytime whereas plant respiration occurs throughout the day. The effects of high night temperature (HNT) and low night temperature (LNT) on plant ecophysiological and growing processes and how the effects vary among different plant functional types (PFTs) have not been analyzed extensively. In this meta-analysis, we examined the effect of HNT and LNT on plant physiology and growth across different PFTs and experimental settings. Plant species were grouped according to their photosynthetic pathways (C3, C4, and CAM), growth forms (herbaceous, woody), and economic purposes (crop, non-crop). We found that HNT and LNT both had a negative effect on plant yield, but the effect of HNT on plant yield was primarily related to a reduction in biomass allocation to reproduction organs and the effect of LNT on plant yield was more related to a negative effect on total biomass. Leaf growth was stimulated at HNT and suppressed at LNT. HNT accelerated plants ecophysiological processes, including photosynthesis and dark respiration, while LNT slowed these processes. Overall, the results showed that the effects of night temperature on plant physiology and growth varied between HNT and LNT, among the response variables and PFTs, and depended on the magnitude of temperature change and experimental design. These findings suggest complexities and challenges in seeking general patterns of terrestrial plant growth in HNT and LNT. The PFT specific responses of plants are critical for obtaining credible predictions of the changes in crop production, plant community structure, vegetation dynamics, biodiversity, and ecosystem functioning of terrestrial biomes when asymmetric night temperature change continues.

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Related in: MedlinePlus

Photosynthetic rate (Anet) and plant height responses to HNT (red) and LNT (blue) in C3 (circles), C4 (triangles), and CAM (stars) species. Each data point represents the mean ± 95% CI. The number of observations for each variable is given on the right of the graph.
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Figure 2: Photosynthetic rate (Anet) and plant height responses to HNT (red) and LNT (blue) in C3 (circles), C4 (triangles), and CAM (stars) species. Each data point represents the mean ± 95% CI. The number of observations for each variable is given on the right of the graph.

Mentions: HNT stimulated Anet by 3.43% for C3 species, but suppressed it by 35.57% for CAM species (Figure 2). Note that there were not enough publications for a summary on C4 species. LNT suppressed Anet more for C4 species than for C3 and CAM species. HNT increased plant height differently for C3 and C4 species by 6.41 and 150%, respectively. For woody species, Anet, Rd and biomass (stem and below-ground) responded more positively, while gs and plant height responded less positively to HNT than for herbaceous species (Figure 3). The LNT effect on woody and herbaceous species was significant for Anet, gs, Tr, stem dry weight and plant height. LNT had a less negative effect on Anet, Tr, and gs but a larger negative effect on stem dry weight and plant height in herbaceous species than in woody species.


Plant Physiological, Morphological and Yield-Related Responses to Night Temperature Changes across Different Species and Plant Functional Types
Photosynthetic rate (Anet) and plant height responses to HNT (red) and LNT (blue) in C3 (circles), C4 (triangles), and CAM (stars) species. Each data point represents the mean ± 95% CI. The number of observations for each variable is given on the right of the graph.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5121221&req=5

Figure 2: Photosynthetic rate (Anet) and plant height responses to HNT (red) and LNT (blue) in C3 (circles), C4 (triangles), and CAM (stars) species. Each data point represents the mean ± 95% CI. The number of observations for each variable is given on the right of the graph.
Mentions: HNT stimulated Anet by 3.43% for C3 species, but suppressed it by 35.57% for CAM species (Figure 2). Note that there were not enough publications for a summary on C4 species. LNT suppressed Anet more for C4 species than for C3 and CAM species. HNT increased plant height differently for C3 and C4 species by 6.41 and 150%, respectively. For woody species, Anet, Rd and biomass (stem and below-ground) responded more positively, while gs and plant height responded less positively to HNT than for herbaceous species (Figure 3). The LNT effect on woody and herbaceous species was significant for Anet, gs, Tr, stem dry weight and plant height. LNT had a less negative effect on Anet, Tr, and gs but a larger negative effect on stem dry weight and plant height in herbaceous species than in woody species.

View Article: PubMed Central - PubMed

ABSTRACT

Land surface temperature over the past decades has shown a faster warming trend during the night than during the day. Extremely low night temperatures have occurred frequently due to the influence of land-sea thermal difference, topography and climate change. This asymmetric night temperature change is expected to affect plant ecophysiology and growth, as the plant carbon consumption processes could be affected more than the assimilation processes because photosynthesis in most plants occurs during the daytime whereas plant respiration occurs throughout the day. The effects of high night temperature (HNT) and low night temperature (LNT) on plant ecophysiological and growing processes and how the effects vary among different plant functional types (PFTs) have not been analyzed extensively. In this meta-analysis, we examined the effect of HNT and LNT on plant physiology and growth across different PFTs and experimental settings. Plant species were grouped according to their photosynthetic pathways (C3, C4, and CAM), growth forms (herbaceous, woody), and economic purposes (crop, non-crop). We found that HNT and LNT both had a negative effect on plant yield, but the effect of HNT on plant yield was primarily related to a reduction in biomass allocation to reproduction organs and the effect of LNT on plant yield was more related to a negative effect on total biomass. Leaf growth was stimulated at HNT and suppressed at LNT. HNT accelerated plants ecophysiological processes, including photosynthesis and dark respiration, while LNT slowed these processes. Overall, the results showed that the effects of night temperature on plant physiology and growth varied between HNT and LNT, among the response variables and PFTs, and depended on the magnitude of temperature change and experimental design. These findings suggest complexities and challenges in seeking general patterns of terrestrial plant growth in HNT and LNT. The PFT specific responses of plants are critical for obtaining credible predictions of the changes in crop production, plant community structure, vegetation dynamics, biodiversity, and ecosystem functioning of terrestrial biomes when asymmetric night temperature change continues.

No MeSH data available.


Related in: MedlinePlus