The effects of abscisic acid and vapor pressure deficit on leaf resistance of Paphiopedilum leeanum

1980 ◽  
Vol 58 (10) ◽  
pp. 1202-1204
Author(s):  
James M. Mayo ◽  
Dave Ehret
Keyword(s):  
Abscisic Acid ◽  
Vapor Pressure ◽  
Guard Cell ◽  
Vapor Pressure Deficit ◽  
Stomatal Movement ◽  
Leaf Resistance

Evidence is presented to show that 1 × 10−5 M abscisic acid reduces transpiration of Paphiopedilum leeanum by 42% and increases leaf resistance by 79%. Increasing vapor pressure deficit from 0.5 kPa to ca. 3.0 kPa increases leaf resistance from ca. 6 S cm−1 to ca. 10 S cm−1. These results are discussed in view of the lack of guard cell chlorophyll and the lack of K+ involvement in stomatal movement in this species.

scholarly journals Role of guard-cell ABA in determining maximal stomatal aperture and prompt vapor-pressure-deficit response

2017 ◽  
Author(s):  
Adi Yaaran ◽  
Boaz Negin ◽  
Menachem Moshelion
Keyword(s):  
Vapor Pressure ◽  
Significant Role ◽  
Guard Cell ◽  
Vapor Pressure Deficit ◽  
Stomatal Closure ◽  
Stomatal Aperture ◽  
Stomatal Response ◽  
Sensing Model ◽  
Aba Insensitive

AbstractAbscisic acid (ABA) is known to be involved in stomatal closure. However, its role in stomatal response to rapid increases in the vapor pressure deficit (VPD) is unclear. To study this issue, we generated guard cell (GC)-specific ABA-insensitive Arabidopsis plants (GC-specific abi1-1; GCabi). Under normal conditions, the stomatal conductance (gs) and apertures of GCabi plants were greater than those of control plants. This supports GC ABA role as limiting maximal stomatal aperture under non-stressful conditions. When there was a rapid increase in VPD (0.15 to 1 kPa), the gs and stomatal apertures of GCabi decreased in a manner similar that observed in the WT control, but different from that observed in WT plants treated with fusicoccin. Low VPD increased the size of the stomatal apertures of the WT, but not of GCabi. We conclude that GC ABA does not play a significant role in the initial, rapid stomatal closure that occurs in response to an increase in VPD, but is important for stomatal adaptation to ambient VPD. We propose a biphasic angiosperm VPD-sensing model that includes an initial passive-hydraulic, ABA-independent phase and a subsequent ABA-dependent steady-state phase in which stomatal behavior is optimized for ambient VPD conditions.HighlightGuard-cell ABA does not play a significant role in the immediate closure of stomata following an increase in the VPD, but is important for stomatal adaptation to ambient VPD.

scholarly journals Effect of Vapor Pressure Deficit on Gas Exchange in Wild-Type and Abscisic Acid–Insensitive Plants

2019 ◽  
Vol 181 (4) ◽  
pp. 1573-1586 ◽  
Author(s):  
Lucas A. Cernusak ◽  
Gregory R. Goldsmith ◽  
Matthias Arend ◽  
Rolf T. W. Siegwolf
Keyword(s):  
Abscisic Acid ◽  
Gas Exchange ◽  
Vapor Pressure ◽  
Vapor Pressure Deficit ◽  
Wild Type

scholarly journals Abscisic Acid Synthesis in Acer rubrum L. Leaves—A Vapor-pressure-deficit-mediated Response

2004 ◽  
Vol 129 (2) ◽  
pp. 182-187 ◽  
Author(s):  
W.L. Bauerle ◽  
T.H. Whitlow ◽  
T.L. Setter ◽  
F.M. Vermeylen
Keyword(s):  
Abscisic Acid ◽  
Vapor Pressure ◽  
Vapor Pressure Deficit ◽  
Acer Rubrum ◽  
Leaf Tissue ◽  
Acid Synthesis ◽  
Accumulation Rates ◽  
Red Maple ◽  
Ecotypic Variation ◽  
Moisture Conditions

Quantitative differences in leaf abscisic acid (ABA) among Acer rubrum L. (red maple) ecotypes were investigated. This study tested the hypothesis that seedlings from wet and dry maternal sites display distinctly different capacities to synthesize ABA in response to atmospheric vapor pressure deficits. The increased levels of ABA in leaf tissue in the red maple ecotypes were associated with atmospheric vapor pressure deficit (VPD). Leaves on well-watered plants responded to VPD by increasing their ABA levels and reducing their photosynthesis (Anet) and stomatal conductance (gs). Both ecotypes appear to accumulate ABA at about the same rate as VPD increased. Despite the similar accumulation rates between ecotypes, wet site ecotypes consistently had a higher level of ABA present in leaf tissue under both low and high VPD conditions. Furthermore, wet site provenances appear to reduce Anet and gs in response to ABA accumulation, whereas dry sites do not present as clear an ABA/gs relationship. This study shows variation between wet and dry site red maple populations in physiological response to atmospheric vapor pressure deficits, indicating that natural ecotypic variation in stomatal responsiveness to air humidity is likely mediated by ABA accumulation in leaf tissue. This research demonstrates that ecotypes of red maple may be selected for atmospheric drought tolerance based on site moisture conditions.

Signalling gates in abscisic acid-mediated control of guard cell ion channels

1997 ◽  
Vol 100 (3) ◽  
pp. 481-490 ◽  
Author(s):  
Michael R. Blatt ◽  
Alexander Grabov
Keyword(s):  
Abscisic Acid ◽  
Ion Channels ◽  
Guard Cell

Effects of Exogenous Abscisic Acid,Nitric Oxide and Hydrogen Peroxide on Stomatal Movement in Petals and Leaves ofZephyranthes candida

2013 ◽  
Vol 31 (3) ◽  
pp. 278
Author(s):  
Wen-Qi XIE ◽  
Jin-Ping ZHANG ◽  
Jian-Yi TAN ◽  
Xiao-Li XUAN ◽  
Yong-Fei WANG ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Abscisic Acid ◽  
Stomatal Movement

Effect of Mycorrhizal Fungi on Gas Exchange of Micropropagated Guava Plantlets (Psidium guajava L.) during Acclimatization and Plant Establishment

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 501c-501
Author(s):  
Andrés A. Estrada-Luna ◽  
Jonathan N. Egilla ◽  
Fred T. Davies
Keyword(s):  
Tissue Culture ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Vapor Pressure ◽  
Mycorrhizal Fungi ◽  
Vapor Pressure Deficit ◽  
Psidium Guajava ◽  
Glomus Etunicatum ◽  
Plant Establishment ◽  
Use Efficiency

The effect of mycorrhizal fungi on gas exchange of micropropagated guava plantlets (Psidium guajava L.) during acclimatization and plant establishment was determined. Guava plantlets (Psidium guajava L. cv. `Media China') were asexually propagated through tissue culture and acclimatized in a glasshouse for eighteen weeks. Half of the plantlets were inoculated with ZAC-19, which is a mixed isolate containing Glomus etunicatum and an unknown Glomus spp. Plantlets were fertilized with modified Long Ashton nutrient solution containing 11 (g P/ml. Gas exchange measurements included photosynthetic rate (A), stomatal conductance (gs), internal CO2 concentration (Ci), transpiration rate (E), water use efficiency (WUE), and vapor pressure deficit (VPD). Measurements were taken at 2, 4, 8 and 18 weeks after inoculation using a LI-6200 portable photosynthesis system (LI-COR Inc. Lincoln, Neb., USA). Two weeks after inoculation, noninoculated plantlets had greater A compared to mycorrhizal plantlets. However, 4 and 8 weeks after inoculation, mycorrhizal plantlets had greater A, gs, Ci and WUE. At the end of the experiment gas exchange was comparable between noninoculated and mycorrhizal plantlets.

scholarly journals Is There Daily Growth Hysteresis versus Vapor Pressure Deficit in Cherry Fruit?

Horticulturae ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 131
Author(s):  
Matteo Zucchini ◽  
Arash Khosravi ◽  
Veronica Giorgi ◽  
Adriano Mancini ◽  
Davide Neri
Keyword(s):  
Vapor Pressure ◽  
Vapor Pressure Deficit ◽  
Fruit Growth ◽  
Hysteresis Curve ◽  
Growth Stages ◽  
Fourth Stage ◽  
The Third ◽  
Third Stage ◽  
Rainy Days ◽  
Clockwise Hysteresis

The growth of cherry fruit is generally described using a double sigmoid model, divided into four growth stages. Abiotic factors are considered to be significant components in modifying fruit growth, and among these, the vapor pressure deficit (VPD) is deemed the most effective. In this study, we investigated sweet cherry fruit growth through the continuous, hourly monitoring of fruit transversal diameter over two consecutive years (2019 and 2020), from the beginning of the third stage to maturation (forth stage). Extensometers were used in the field and VPD was calculated from weather data. The fruit growth pattern up to the end of the third stage demonstrated three critical steps during non-rainy days: shrinkage, stabilization and expansion. In the third stage of fruit growth, a partial clockwise hysteresis curve of circadian growth, as a response to VPD, appeared on random days. The pattern of fruit growth during rainy days was not distinctive, but the amount and duration of rain caused a consequent decrease in the VPD and indirectly boosted fruit growth. At the beginning of the fourth stage, the circadian growth changed and the daily transversal diameter vs VPD formed fully clockwise hysteresis curves for most of this stage. Our findings indicate that hysteresis can be employed to evaluate the initial phenological phase of fruit maturation, as a fully clockwise hysteresis curve was observable only in the fourth stage of fruit growth. There are additional opportunities for its use in the management of fruit production, such as in precision fruit farming.

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