Abstract
Global climate change and the associated increasing impact of droughts on crops challenges researchers to rapidly assess plant health on a large scale. Photosynthetic activity is one of the key physiological parameters related to future crop yield. The present study focuses on the search for reflectance parameters for rapid screening of wheat genotypes with respect to photosynthetic activity under drought conditions. The development of drought stress modelled in laboratory conditions by stopping irrigation caused changes in chlorophyll fluorescence parameters that corresponded to a decrease in photosynthetic activity. In particular, a decrease in the photochemical quantum yield of photosystem II (ΦPSII), which characterizes the rate of linear electron transport in the photosynthetic electron transport chain and is one of the most sensitive parameters responding at the early stages of drought stress, was observed. Along with the measurement of the photosynthetic activity, spectral characteristics of wheat plants were recorded using hyperspectral imaging. Normalized difference indices (NDIs) were calculated using the reflectance intensity of wheat shoots in the range from 400 to 1000 nm. Four NDIs that showed a strong correlation with the level of photosynthetic activity estimated by ΦPSII were selected from different wavelength ranges (NDI610/450, NDI572/545, NDI740/700, and NDI820/630). The indices NDI572/545 and NDI820/630 showed the best combination of sensitivity to soil moisture deficit and strong relationship with photosynthetic activity under drought stress. Possible molecular and physiological causes of this relationship are discussed. The use of the proposed indices will allow to monitor in detail the specific features of wheat plant response and can serve as one of the criteria for selection of the most promising genotypes in breeding of drought-tolerant cultivars.
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Claims 4
Claim · model-written summary
Drought stress induced in the laboratory by stopping irrigation changed chlorophyll fluorescence parameters in a way that corresponded to a decrease in photosynthetic activity in wheat.
- Taxon
- Wheat Plants
Triticum aestivumt0 - Treatment
- stopping irrigatione0
- Outcome
- photosynthetic activitye0
- Direction
- decreasee0
- Setting
- laboratory conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Plants”
e0“drought stress modelled in laboratory conditions by stopping irrigation caused changes in chlorophyll fluorescence parameters that corresponded to a decrease in photosynthetic activity”
Claim · model-written summary
Drought stress decreased the photochemical quantum yield of photosystem II (PhiPSII) in wheat.
- Taxon
- Wheat PlantsTriticum aestivumt0
- Treatment
- stopping irrigatione0
- Outcome
- photochemical quantum yield of photosystem II (ΦPSII)e1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Plants”
e0“The development of drought stress modelled in laboratory conditions by stopping irrigation”
e1“a decrease in the photochemical quantum yield of photosystem II (ΦPSII)”
Claim · model-written summary
Four normalized difference indices (NDI610/450, NDI572/545, NDI740/700, NDI820/630) correlated strongly with photosynthetic activity estimated by PhiPSII.
- Taxon
- Wheat PlantsTriticum aestivumt0
- Outcome
- strong correlatione0
- Qualifier
- NDI610/450, NDI572/545, NDI740/700, and NDI820/630e1
- Comparator
- photosynthetic activity estimated by ΦPSIIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Plants”
e0“Four NDIs that showed a strong correlation with the level of photosynthetic activity estimated by ΦPSII”
e1“NDI610/450, NDI572/545, NDI740/700, and NDI820/630”
Claim · model-written summary
NDI572/545 and NDI820/630 showed the best combination of sensitivity to soil moisture deficit and strong relationship with photosynthetic activity under drought stress.
- Taxon
- Wheat PlantsTriticum aestivumt0
- Treatment
- drought stresse0
- Outcome
- strong relationship with photosynthetic activitye0
- Direction
- higherinferrede0
- Qualifier
- NDI572/545 and NDI820/630e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Plants”
e0“The indices NDI572/545 and NDI820/630 showed the best combination of sensitivity to soil moisture deficit and strong relationship with photosynthetic activity under drought stress”
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irrigation · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
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