Kaolin particle film modulates morphological, physiological and biochemical olive tree responses to drought and rewatering

Brito, Cátia; Dinis, Lia-Tânia; Ferreira, Helena; Rocha, Luís; Pavia, Ivo; Moutinho-Pereira, José; Correia, Carlos M.

doi:10.1016/j.plaphy.2018.10.028

Cited by 33 publications

(39 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, in mature grapevines grown in the field, Dinis et al [ 29 ] showed a kaolin-induced reduction of leaf ABA associated with better leaf stomatal conductance than untreated vines at leaf water potential lower than -1 MPa. Brito et al [ 16 ] reported similar responses in olive trees.…”

Section: Introductionmentioning

confidence: 76%

“…Under water shortage, kaolin is able to maintain better assimilation and transpiration rates, to avoid photosystem II efficiency loss and to prevent leaf photoinhibition and abscission [ 9 , 12 , 13 , 14 , 15 ]. Its mechanism of action is primarily related to the increase of light reflection that reduces the radiation absorbed by the leaf [ 7 , 8 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kaolin Reduces ABA Biosynthesis through the Inhibition of Neoxanthin Synthesis in Grapevines under Water Deficit

Frioni

Tombesi

Sabbatini

et al. 2020

IJMS

View full text Add to dashboard Cite

In many viticulture regions, multiple summer stresses are occurring with increased frequency and severity because of warming trends. Kaolin-based particle film technology is a technique that can mitigate the negative effects of intense and/or prolonged drought on grapevine physiology. Although a primary mechanism of action of kaolin is the increase of radiation reflection, some indirect effects are the protection of canopy functionality and faster stress recovery by abscisic acid (ABA) regulation. The physiological mechanism underlying the kaolin regulation of canopy functionality under water deficit is still poorly understood. In a dry-down experiment carried out on grapevines, at the peak of stress and when control vines zeroed whole-canopy net CO2 exchange rates/leaf area (NCER/LA), kaolin-treated vines maintained positive NCER/LA (~2 µmol m−2 s−1) and canopy transpiration (E) (0.57 µmol m−2 s−1). Kaolin-coated leaves had a higher violaxanthin (Vx) + antheraxanthin (Ax) + zeaxanthin (Zx) pool and a significantly lower neoxanthin (Nx) content (VAZ) when water deficit became severe. At the peak of water shortage, leaf ABA suddenly increased by 4-fold in control vines, whereas in kaolin-coated leaves the variation of ABA content was limited. Overall, kaolin prevented the biosynthesis of ABA by avoiding the deviation of the VAZ epoxidation/de-epoxidation cycle into the ABA precursor (i.e., Nx) biosynthetic direction. The preservation of the active VAZ cycle and transpiration led to an improved dissipation of exceeding electrons, explaining the higher resilience of canopy functionality expressed by canopies sprayed by kaolin. These results point out the interaction of kaolin with the regulation of the VAZ cycle and the active mechanism of stomatal conductance regulation.

show abstract

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Kaolin Reduces ABA Biosynthesis through the Inhibition of Neoxanthin Synthesis in Grapevines under Water Deficit

Frioni

Tombesi

Sabbatini

et al. 2020

IJMS

View full text Add to dashboard Cite

show abstract

“…Throughout the experiments, the effects of kaolin on transpiration were positively associated with increasing stomatal conductance and negatively related to P N /g s . However, during the midday period of the ripening stage of 2018 in the Douro region, decreased leaf P N and g s in TN_KL plants -without significant effects on leaf P N /g s and C i /C a parameters -may corroborate the hypothesis that kaolin efficiency is higher under more severe summer stress conditions (Brito et al, 2018). Conversely, TF_KL grapevines showed improved leaf P N /g s and decreased C i /C a in the same period, suggesting that beyond stress severity, which can modulate grapevine physiological responses (Moutinho-Pereira et al, 2004), kaolin efficiency as a short-term mitigation strategy may also depend on intrinsic varietal features.…”

Section: Discussionmentioning

confidence: 58%

“…Beyond their role in supplying energy, carbohydrates can regulate a wide range of mechanisms, including photosynthesis, sugar transport, defence reactions, secondary metabolism, hormonal balance and berry development (Lecourieux et al, 2014), as reported in this study (Figure 2). Since summer stress was more prominent in 2017, and particularly in the Douro region, high leaf SS accumulation may promote carbohydrate storage and growth, maintaining cell homeostasis in kaolin treated leaves, as recently observed in some Mediterranean field crops (Brito et al, 2018;Dinis et al, 2018b). However, under non-limiting summer stress conditions, such as those recorded during the 2018 growing season, kaolin application decreased foliar carbohydrate accumulation at ripening, which was previously shown to be linked to increasing photosynthetic rates, and reserve mobilisation and export (Sami et al, 2016;Brito et al, 2019b).…”

Section: Discussionmentioning

confidence: 63%

Optimising grapevine summer stress responses and hormonal balance by applying kaolin in two Portuguese Demarcated Regions

et al. 2021

Self Cite

View full text Add to dashboard Cite

In Mediterranean-like climate areas, field-grown grapevines are typically exposed to severe environmental conditions during the summer season, which can negatively impact the sustainability of viticulture. Despite the short-term mitigation strategies available nowadays to cope with climate change, little is known regarding their effectiveness in different demarcated winegrowing regions with differing climate features. Hence, we applied a kaolin suspension (5 %) to Touriga-Franca (TF) and Touriga-Nacional (TN) grapevine varieties located in two Portuguese demarcated regions (Alentejo and Douro) with different mesoclimates to study its effect on the physiological performance, hormonal balance and ABA-related grapevine leaf gene expression during the 2017 and 2018 growing seasons. Data show that 2017 was warmer than 2018 due to the occurrence of two heatwaves in both locations, highlighting the protective effect of kaolin application under severe environmental conditions. In the first study year, at midday, kaolin enhanced water use efficiency (23 % in Douro and 13 % in Alentejo), carbon assimilation rates (PN; 72 % in Douro and 25 % in Alentejo), and the soluble sugar content of grapevine leaves, while decreasing the accumulation of plant growth regulators (ABA, IAA, and SA) during the ripening stage. The results show an up-regulation of ABA biosynthesis-related genes (VvNCED) in TF treated vines from the Douro vineyard mainly in 2017, suggesting an increased stress response under severe summer conditions. Additionally, kaolin triggered the expression of ABA-responsive genes (VvHVA22a and VvSnRK2.6) mainly in TF, indicating different varietal responses to kaolin application under fluctuating periods of summer stress.

show abstract

“…Numerous studies have reported the identi cation of functional genes that are relevant to plant stress tolerance and that can be used for crop improvement [18][19][20][21]. To aid efforts to breed salinity tolerance in soybean, we analyzed the orthologs of plasma membrane intrinsic proteins (PIPs) in soybean and tested their interactions using a yeast two-hybrid system.…”

Section: Discussionmentioning

confidence: 99%

Characterization of interactions between the soybean plasma membrane- intrinsic proteins GmPIP1s and GmPIP2s responding to salt stress

Liu

Zhang

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Salt tolerance is a key trait in soybean breeding and plant responses to salt stress include physiological and biochemical changes that affect the movement of water across the plasma membrane. In this study, we report the interactions of a set of aquaporins, soybean (Glycine max) plasma membrane-intrinsic proteins (GmPIPs), in response to salt stress. Results: GmPIP1;5 and GmPIP1;6 formed hetero-tetramers with GmPIP2;4, GmPIP2;6, GmPIP2;8, GmPIP2;9, GmPIP2;11, and GmPIP2;13. We detected interactions between GmPIP1;6 and GmPIP1;7, but not between GmPIP1;6 and GmPIP1;5. Furthermore, GmPIP2;9 formed homo-tetramers, and this interaction was strengthened under salt and osmotic stress. Expression analysis indicated complex and unique responses to salt stress depending on the duration of the stress. For example, GmPIP2;8, encoding one of the heteromer-forming PIP proteins, was highly up-regulated under early salt stress.Conclusions: Our study highlights the vital role of hetero- and homo-tetramers, in salt tolerance; and improves understanding of the mechanisms by which soybean aquaporin isoforms respond to abiotic stress.

show abstract

Kaolin particle film modulates morphological, physiological and biochemical olive tree responses to drought and rewatering

Cited by 33 publications

References 56 publications

Kaolin Reduces ABA Biosynthesis through the Inhibition of Neoxanthin Synthesis in Grapevines under Water Deficit

Kaolin Reduces ABA Biosynthesis through the Inhibition of Neoxanthin Synthesis in Grapevines under Water Deficit

Optimising grapevine summer stress responses and hormonal balance by applying kaolin in two Portuguese Demarcated Regions

Characterization of interactions between the soybean plasma membrane- intrinsic proteins GmPIP1s and GmPIP2s responding to salt stress

Contact Info

Product

Resources

About