Fluorescence induction changes in bean leaves after heat treatment

Levykina, I. P.; Karavaev, V. A.

doi:10.3103/s0027134916010124

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Due to the current sample rate we used, normally 0.8 s, we could not capture the behaviour of the fast transient (OJIP). Instead, the peak that we follow is likely something that is similar to the second maximum, M. A previous study on bean leaves [39] reported that the time of the M-peak decreased for an increased heat stress on the leaves. This is clearly in line with our results, in that a short peak time indicated plant stress.…”

Section: Discussionmentioning

confidence: 53%

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

et al. 2021

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Chlorophyll fluorescence is interesting for phenotyping applications as it is rich in biological information and can be measured remotely and non-destructively. There are several techniques for measuring and analysing this signal. However, the standard methods use rather extreme conditions, e.g., saturating light and dark adaption, which are difficult to accommodate in the field or in a greenhouse and, hence, limit their use for high-throughput phenotyping. In this article, we use a different approach, extracting plant health information from the dynamics of the chlorophyll fluorescence induced by a weak light excitation and no dark adaption, to classify plants as healthy or unhealthy. To evaluate the method, we scanned over a number of species (lettuce, lemon balm, tomato, basil, and strawberries) exposed to either abiotic stress (drought and salt) or biotic stress factors (root infection using Pythium ultimum and leaf infection using Powdery mildew Podosphaera aphanis). Our conclusions are that, for abiotic stress, the proposed method was very successful, while, for powdery mildew, a method with spatial resolution would be desirable due to the nature of the infection, i.e., point-wise spread. Pythium infection on the roots is not visually detectable in the same way as powdery mildew; however, it affects the whole plant, making the method an interesting option for Pythium detection. However, further research is necessary to determine the limit of infection needed to detect the stress with the proposed method.

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Section: Discussionmentioning

confidence: 53%

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

et al. 2021

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“…On the other hand, to our knowledge, F V / F M ‐based T 50 has not been documented as a critical transition temperature for membrane fluidity. Despite lacking such mechanistic underpinning, T 50 could putatively be a comprehensive metric as it contains information on both F O and F M which were shown to be differentially responsive to heat and other abiotic stressors (Dreyer et al, 1992; Goltsev et al, 1994; Levykina & Karavaev, 2016; Méthy et al, 1997; Terzaghi et al, 1989). Further, T 50 of leaves (measured 24 h after temperature incubation) has been shown to correspond well with postheat leaf necrosis (Bigras, 2000; also see Cunningham & Read, 2006) and therefore T 50 can also be a useful parameter connecting photophysiology with tissue survival.…”

Section: Discussionmentioning

confidence: 99%

Short‐term warming does not affect intrinsic thermotolerance but induces strong sustaining photoprotection in tropical evergreen citrus genotypes

Guha

Vharachumu

Khalid

et al. 2021

Plant Cell & Environment

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Consequences of warming and postwarming events on photosynthetic thermotolerance (PT) and photoprotective responses in tropical evergreen species remain elusive. We chose Citrus to answer some of the emerging questions related to tropical evergreen species' PT behaviour including (i) how wide is the genotypic variation in PT? (ii) how does PT respond to short‐term warming and (iii) how do photosynthesis and photoprotective functions respond over short‐term warming and postwarming events? A study on 21 genotypes revealed significant genotypic differences in PT, though these were not large. We selected five genotypes with divergent PT and simulated warming events: Tmax 26/20°C (day‐time highest maximum/night‐time lowest maximum) (Week 1) < Tmax 33/30°C (Week 2) < Tmax 36/32°C (Week 3) followed by Tmax 26/16°C (Week 4, recovery). The PT of all genotypes remained unaltered despite strong leaf megathermy (leaf temperature > air temperature) during warming events. Though moderate warming showed genotype‐specific stimulation in photosynthesis, higher warming unequivocally led to severe loss in net photosynthesis and induced higher nonphotochemical quenching. Even after a week of postwarming, photoprotective mechanisms strongly persisted. Our study points towards a conservative PT in evergreen citrus genotypes and their need for sustaining higher photoprotection during warming as well as postwarming recovery conditions.

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Complexity of Chlorophyll Fluorescence Dynamic Response as an Indicator of Excessive Light Intensity**This work was funded by the Mistra Innovation research program, within the Swedish Foundation for Strategic Environmental Research (Mistra).

et al. 2016

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Fluorescence induction changes in bean leaves after heat treatment

Cited by 3 publications

References 24 publications

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

Short‐term warming does not affect intrinsic thermotolerance but induces strong sustaining photoprotection in tropical evergreen citrus genotypes

Complexity of Chlorophyll Fluorescence Dynamic Response as an Indicator of Excessive Light Intensity**This work was funded by the Mistra Innovation research program, within the Swedish Foundation for Strategic Environmental Research (Mistra).

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