scholarly journals Elevated [CO2] Mitigates Drought Effects and Increases Leaf 5-O-Caffeoylquinic Acid and Caffeine Concentrations During the Early Growth of Coffea Arabica Plants

2021 ◽  
Vol 5 ◽  
Author(s):  
Ingrid C. A. Catarino ◽  
Gustavo B. Monteiro ◽  
Marcelo J. P. Ferreira ◽  
Luce M. B. Torres ◽  
Douglas S. Domingues ◽  
...  
Keyword(s):  
Coffea Arabica ◽  
Early Growth ◽  
Water Withdrawal ◽  
Total Phenolic ◽  
Severe Drought ◽  
Specialized Metabolites ◽  
Caffeoylquinic Acid ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Mild Drought

Increasing atmospheric [CO2] is thought to contribute to changes in precipitation patterns, increasing heatwaves and severe drought scenarios. However, how the combination of elevated [CO2] and progressive drought affect plant metabolism is poorly understood. Aiming to investigate the effects of this environmental condition on photosynthesis and specialized metabolites in leaves of Coffea arabica during the early growth, plants fertilized with ambient (a[CO2]-400 ppm) and elevated (e[CO2]-800 ppm) [CO2] were exposed to well-watered (WW) or water-deficit (WD) regimes for 40 days. Over the 40-day-water-withdrawal, soil moisture, and leaf water potential decreased compared to WW-condition. Elevated [CO2] stimulates CO2 assimilation (A) and intrinsic water use efficiency (iWUE) even under WD. Drought condition slightly changed stomatal conductance, transpiration rate and maximum quantum efficiency of photosystem II (PSII) regardless of [CO2] compared to WW-plants. Total soluble amino acid concentration did not change significantly, while total phenolic compounds concentration decreased under e[CO2] regardless of water regimes. The combination of e[CO2]+WD increased the 5-O-caffeoylquinic acid (5-CQA) and caffeine amounts by 40-day when compared to a[CO2]+WD plants. Altogether, these results suggest that e[CO2] buffers mild-drought stress in young C. arabica by increasing A, iWUE and stimulating changes in the leaf contents of 5-CQA and caffeine.

scholarly journals Effects of mild and severe drought stress on the biomass, phenolic compounds production and photochemical activity of Aloe vera (L.) Burm.f.

2018 ◽  
Vol 111 (2) ◽  
pp. 463 ◽  
Author(s):  
Ghader HABIBI
Keyword(s):  
Drought Stress ◽  
Secondary Metabolite ◽  
Soluble Sugars ◽  
Compatible Solutes ◽  
Aloe Vera ◽  
Photochemical Activity ◽  
Leaf Biomass ◽  
Total Phenolic ◽  
Severe Drought ◽  
Mild Drought

<p><span style="font-family: Times New Roman;"><span style="font-size: medium;">In this study, the biomass, compatible solutes, PSII functioning and phenolic profiles of <em>Aloe vera</em> (<a title="Carl Linnaeus" href="https://en.wikipedia.org/wiki/Carl_Linnaeus">L.</a>) <a title="" href="https://en.wikipedia.org/wiki/Nicolaas_Laurens_Burman">Burm.f.</a> leaves were investigated at different time intervals after drought stress (20, 40 and 80 % of the field capacity). While the impaired ability of leaves for synthesis of assimilates caused growth inhibition in <em>A. vera</em> under severe drought stress, we observed that the content of proline, soluble sugars, total phenolic and flavonoids tended to increase in plants treated with mild drought stress. Under mild drought stress, the increased leaf thickness correlated with the higher productivity in terms of leaf biomass and gel production. Also, mild drought stress enhanced photochemical activity in <em>Aloe</em> leaves,<strong> </strong>and<strong> </strong>changed the entire quantity of secondary metabolite of vanillic acid produced, which may be considered to obtain better growth and considerable secondary metabolite of the medicinal <em>Aloe</em> plants treated with mild drought stress.</span></span></p>

scholarly journals IS ABSCISIC ACID INVOLVED IN THE DROUGHT RESPONSES OF BRAZILIAN GREEN DWARF COCONUT?

2009 ◽  
Vol 45 (2) ◽  
pp. 189-198 ◽  
Author(s):  
F. P. GOMES ◽  
M. A. OLIVA ◽  
M. S. MIELKE ◽  
A-A. F. DE ALMEIDA ◽  
H. G. LEITE ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Potential ◽  
Water Use ◽  
Severe Drought ◽  
Use Efficiency ◽  
Recovery Cycles ◽  
Mild Drought

SUMMARYAbscisic acid (ABA) accumulation in leaves of drought-stressed coconut palms and its involvement with stomatal regulation of gas exchange during and after stress were investigated. Two Brazilian Green Dwarf coconut ecotypes from hot/humid and hot/dry environments were submitted to three consecutive drying/recovery cycles under greenhouse conditions. ABA accumulated in leaflets before significant changes in pre-dawn leaflet water potential (ΨPD) and did not recover completely in the two ecotypes after 8 days of rewatering. Stomatal conductance was influenced by ABA under mild drought and by ΨPD under severe drought. There were no significant differences between the ecotypes for most variables measured. However, the ecotype from a hot/dry environment showed higher water use efficiency after repeated cycles of water stress.

Increasing intrinsic water-use efficiency over the past 160 years does not stimulate tree growth in southeastern China

2018 ◽  
Vol 76 (2) ◽  
pp. 115-130 ◽  
Author(s):  
G Guo ◽  
K Fang ◽  
J Li ◽  
HW Linderholm ◽  
D Li ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Growth ◽  
Southeastern China ◽  
The Past ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

Improving Intrinsic Water-Use Efficiency and Crop Yield

Crop Science ◽  
2002 ◽  
Vol 42 (1) ◽  
pp. 122 ◽  
Author(s):  
A. G. Condon ◽  
R. A. Richards ◽  
G. J. Rebetzke ◽  
G. D. Farquhar
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Crop Yield ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

scholarly journals MORPHOPHYSIOLOGICAL CHARACTERISTICS OF ARABIC COFFEE

Nativa ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 36-43
Author(s):  
Lucas Aparecido Manzani Lisboa ◽  
Matheus Luís Oliveira Cunha ◽  
Fernando Takayuki Nakayama ◽  
Paulo Alexandre Monteiro de Figueiredo ◽  
Ronaldo da Silva Viana ◽  
...  
Keyword(s):  
Plant Physiology ◽  
Coffea Arabica ◽  
Plant Morphology ◽  
Co2 Assimilation ◽  
Climatic Conditions ◽  
Assimilation Rate ◽  
Abaxial Epidermis ◽  
Internal Morphology ◽  
Use Efficiency ◽  
Best Fit

The understanding of the behavior of each cultivar under adverse climatic conditions is important in the choice of plants that best fit the region to be inserted. Due to the large number of cultivars available on the market it makes it difficult for producers to choose which material to plant. In view of the above, this study aimed to know the morphophysiological characteristics of coffee. The experimental design was in randomized blocks with 10 treatments, that is, arabic coffee varieties: Catuai IAC62; Catuai IAC99; Ouro IAC4397; Tupi RN IAC1669-13; Obatã IAC1669-20; Mundo Novo IAC379-24; Mundo Novo IAC 388-17-2; Mundo Novo SH3 Faz São José; Bourbon IACJ15 and Icatu IAC 2944-11 and with four replications totaling 40 plots, where each plot was composed of seven plants. The Mundo Novo IAC 388-17-2 coffee variety shows higher yield in the seventh year of cultivation. Variety of Bourbon IACJ15 coffee presented water use efficiency (EUW) which did not reflect in higher productivity. The Catuai V IAC99 arabica coffee variety stood out in the internal morphology of the leaves. The thickness of the adaxial and abaxial epidermis (TADE and TABE) and the CO2 assimilation rate (A) showed negative correlations with the productivity of processed coffee bags. Keywords: Coffea arabica; plant morphology; plant physiology; varieties.

scholarly journals Elevated CO2 Modulates Plant Hydraulic Conductance Through Regulation of PIPs Under Progressive Soil Drying in Tomato Plants

2021 ◽  
Vol 12 ◽  
Author(s):  
Shenglan Li ◽  
Liang Fang ◽  
Josefine Nymark Hegelund ◽  
Fulai Liu
Keyword(s):  
Drought Stress ◽  
Hydraulic Conductance ◽  
Water Relation ◽  
Severe Drought ◽  
Soil Drying ◽  
Plant Water ◽  
Transcriptional Responses ◽  
Plant Water Use ◽  
Use Efficiency ◽  
Plasma Membrane Intrinsic Proteins

Increasing atmospheric CO2 concentrations accompanied by abiotic stresses challenge food production worldwide. Elevated CO2 (e[CO2]) affects plant water relations via multiple mechanisms involving abscisic acid (ABA). Here, two tomato (Solanum lycopersicum) genotypes, Ailsa Craig (AC) and its ABA-deficient mutant (flacca), were used to investigate the responses of plant hydraulic conductance to e[CO2] and drought stress. Results showed that e[CO2] decreased transpiration rate (E) increased plant water use efficiency only in AC, whereas it increased daily plant water consumption and osmotic adjustment in both genotypes. Compared to growth at ambient [CO2], AC leaf and root hydraulic conductance (Kleaf and Kroot) decreased at e[CO2], which coincided with the transcriptional regulations of genes of plasma membrane intrinsic proteins (PIPs) and OPEN STOMATA 1 (OST1), and these effects were attenuated in flacca during soil drying. Severe drought stress could override the effects of e[CO2] on plant water relation characteristics. In both genotypes, drought stress resulted in decreased E, Kleaf, and Kroot accompanied by transcriptional responses of PIPs and OST1. However, under conditions combining e[CO2] and drought, some PIPs were not responsive to drought in AC, indicating that e[CO2] might disturb ABA-mediated drought responses. These results provide some new insights into mechanisms of plant hydraulic response to drought stress in a future CO2-enriched environment.

Sign in / Sign up

Export Citation Format

Share Document