Loss of <scp>SALT OVERLY SENSITIVE 1</scp> prevents virescence in chloroplast K+/H+ EFFLUX ANTIPORTER-deficient mutants

DeTar, Rachael Ann; Höhner, Ricarda; Manavski, Nikolay; Blackholm, Marius; Meurer, Jörg; Kunz, Hans‐Henning

doi:10.1093/plphys/kiac142

Cited by 2 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, right after the frost stress, photochemistry was reduced to a minimum (Figure 1A, 'After'), and later, during the light, absorbed energy that was diverted towards the photoprotective mechanisms was minimized as well. Quantum yield significantly decreased in corn (Z. mays) [24], Arabidopsis (A. thaliana) [25], and potato (S. toberosum) leaves [26] in response to water stress, silencing of two membranal ion transporters, and sap sucked by insects, respectively. In the case of potato, upon interaction with the insect, necrotic patches appeared in the leaf tissues.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study between the Photosynthetic Parameters of Two Avocado (Persea americana) Cultivars Reveals Natural Variation in Light Reactions in Response to Frost Stress

et al. 2022

View full text Add to dashboard Cite

Avocado is a commercially important fruit tree which is sold worldwide. Originating in subtropical regions of the South America, this species is now grown worldwide and is sometimes exposed to cold temperatures. Specifically, frost stress harms the crop yield and its quality. While it is known in general that the photosynthetic apparatus changes in response to cold conditions, there is still not much information regarding the photosynthetic apparatus response to sporadic frost stress. In this study, we tracked the photosynthetic apparatus’ light reaction of ‘Hass’ and ‘Ettinger’ avocado cultivars to frost stress, with Ettinger being known to be more resilient to cold than Hass. We found that in avocado trees, the photosynthetic apparatus’ response to frost occurs at the level of photosystem II (PSII) itself, rather than a photoprotective response to a stress. The Hass apparatus incorrectly interprets the reduction in electron transport rate activity and by that increases its light harvesting complex size at the expense of its reaction centers which then increases the apparatus’ probability to generate reactive oxygen species. The results of this study open opportunities to further research the process which regulates the feedback mechanism that controls the photosynthetic unit’s size in Hass when compared to the Ettinger cultivar, and whether it is part of a feedback regulation from the carbon assimilation step or indirectly from a stomatal limitation which arises in these subtropical species. While corroborating past studies performed on avocados, this study suggests using advanced chlorophyll a fluorescence protocols when researching natural variation in crops.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparative Study between the Photosynthetic Parameters of Two Avocado (Persea americana) Cultivars Reveals Natural Variation in Light Reactions in Response to Frost Stress

et al. 2022

View full text Add to dashboard Cite

show abstract

“…High safety requirements have limited their use mostly to root uptake and make it difficult to adapt these for organellar transport studies. Since physiological Rb + levels in plants are generally very low, cold Rb + feeding and subsequent elemental analysis may provide an interesting alternative if it can be realized on isolated organelles (DeTar et al ., 2022). A potential game‐changer are genetically encoded ion sensors.…”

Section: Outlook and Recommendations To The Fieldmentioning

confidence: 99%

Chloroplast ion homeostasis – what do we know and where should we go?

Kunz,

Armbruster,

Mühlbauer

et al. 2024

New Phytologist

Self Cite

View full text Add to dashboard Cite

SummaryPlant yields heavily depend on proper macro‐ and micronutrient supply from the soil. In the leaf cells, nutrient ions fulfill specific roles in biochemical reactions, especially photosynthesis housed in the chloroplast. Here, a well‐balanced ion homeostasis is maintained by a number of ion transport proteins embedded in the envelope and thylakoid membranes. Ten years ago, the first alkali metal transporters from the K+ EFFLUX ANTIPORTER family were discovered in the model plant Arabidopsis. Since then, our knowledge about the physiological importance of these carriers and their substrates has greatly expanded. New insights into the role of alkali ions in plastid gene expression and photoprotective mechanisms, both prerequisites for plant productivity in natural environments, were gained. The discovery of a Cl− channel in the thylakoid and several additional plastid alkali and alkali metal transport proteins have advanced the field further. Nevertheless, scientists still have long ways to go before a complete systemic understanding of the chloroplast's ion transportome will emerge. In this Tansley review, we highlight and discuss the achievements of the last decade. More importantly, we make recommendations on what areas to prioritize, so the field can reach the next milestones. One area, laid bare by our similarity‐based comparisons among phototrophs is our lack of knowledge what ion transporters are used by cyanobacteria to buffer photosynthesis fluctuations.

show abstract

Loss of SALT OVERLY SENSITIVE 1 prevents virescence in chloroplast K+/H+ EFFLUX ANTIPORTER-deficient mutants

Abstract: Defects in two plastid K+/H+ EFFLUX ANTIPORTERs in Arabidopsis can be relieved by loss of a plasma membrane Na+/H+ exchanger, presumably by altering plant K+ transport.

Cited by 2 publications

References 18 publications

Comparative Study between the Photosynthetic Parameters of Two Avocado (Persea americana) Cultivars Reveals Natural Variation in Light Reactions in Response to Frost Stress

Comparative Study between the Photosynthetic Parameters of Two Avocado (Persea americana) Cultivars Reveals Natural Variation in Light Reactions in Response to Frost Stress

Chloroplast ion homeostasis – what do we know and where should we go?

Contact Info

Product

Resources

About