Photosynthetic pigments, morphology and leaf gas exchange during ex vitro acclimatization of micropropagated CAM Doritaenopsis plantlets under relative humidity and air temperature

2006 ◽  
Vol 55 (1-2) ◽  
pp. 183-194 ◽  
Author(s):  
Min-Wha Jeon ◽  
Mohammad Babar Ali ◽  
Eun-Joo Hahn ◽  
Kee-Yoeup Paek
Keyword(s):  
Relative Humidity ◽  
Gas Exchange ◽  
Air Temperature ◽  
Photosynthetic Pigments ◽  
Leaf Gas Exchange ◽  
Ex Vitro

scholarly journals 206 Growth, Gas Exchange, and Water Relations of Micropropagated Chile Ancho Pepper (Capsicum annuum L. cv. San Luis) Plantlets during Acclimatization and Post-acclimatization

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 426D-426 ◽  
Author(s):  
Andres A. Estrada-Luna ◽  
Fred T. Davies ◽  
Jonathan N. Egilla
Keyword(s):  
Gas Exchange ◽  
Capsicum Annuum ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Dry Mass ◽  
Ex Vitro ◽  
San Luis ◽  
Transplant Shock ◽  
Relative Water

Micropropagated chile ancho pepper (Capsicum annuum L. cv. San Luis) plants were transferred to ex vitro conditions to study plantlet performance and selected physiological changes that occur during acclimatization and post-acclimatization. The physiology of the plantlets was characterized by measuring leaf gas exchange and water status. Plant growth was determined by assessing plant height, leaf number, total leaf area, relative growth rate (RGR), and leaf, root, and stem dry mass. Measurements were taken at 0, 1, 2, 3, 6, 12, and 24 days after transplanting. After initial transplanting ex vitro to liner pots with soilless media, plantlet wilting was observed that correlated with reduced leaf relative water content (RWC). Water stress was partially alleviated by a reduction in stomatal conductance (gs), confirming that the in vitro formed stomata were functional and able to regulate transpiration (E) to minimize desiccation losses. Because of this stomatal control, plantlets had minimal transplant shock, recovered, and survived. Prior to transplanting, micropropagated plantlets showed heterotrophic/mixotrophic characteristics as indicated by low photosynthesis [(A) 4.74 μmol·m2·s-1]. During acclimatization, RWC, gs, E, and A were significantly lower 2 days after transplanting. However, within 6 days after transplanting, plantlets recovered and became autotrophic, attaining high A (16.3 μmol·m-2·s-1), gs, and E. The stabilization and improvement of plantlet water status and gas exchange during acclimatization and post-acclimatization closely correlated with dramatic increases in plantlet growth.

Alteration in Growth, Leaf Gas Exchange, and Photosynthetic Pigments of Maize Plants Under Combined Cadmium and Arsenic Stress

2016 ◽  
Vol 228 (1) ◽  
Author(s):  
Shakeel Ahmad Anjum ◽  
Mohsin Tanveer ◽  
Saddam Hussain ◽  
Umair Ashraf ◽  
Imran Khan ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Photosynthetic Pigments ◽  
Leaf Gas Exchange ◽  
Arsenic Stress ◽  
Maize Plants

scholarly journals CO2 assimilation and transpiration balance in species of genus Vitis cultivated in vivo and in vitro. Estimation of stomatal and cuticular transpiration in vitro

OENO One ◽  
1998 ◽  
Vol 32 (2) ◽  
pp. 91
Author(s):  
Francesco Iacono ◽  
Lucia Martinelli
Keyword(s):  
Relative Humidity ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Photosynthetic Photon Flux Density ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Cuticular Transpiration ◽  
Vitis Riparia

<p style="text-align: justify;">The influence of genotype on leaf gas exchange was investigated for <em>Vitis riparia</em> and <em>Vitis rupestris</em> plants cultured <em>in vivo</em> and <em>in vitro</em>. Gas exchange was measured at constant temperature and photosynthetic photon flux density and at varying relative humidity from 75 p. cent to 65 p. cent.</p><p style="text-align: justify;">Differences of transpiration and CO<sub>2</sub> assimilation rates between genotypes were observed that did not depend upon conditions. Water use efficiency was strongly controlled by the genotype.</p><p style="text-align: justify;">Linear correlations between assimilation, transpiration and relative humidity were used to estimate extra stomatal (cuticular) and stomatal transpiration of <em>in vitro</em> plants. Cuticular transpiration of in vitro plants was also measured directly during the darkness. Our results confirmed the indirect estimates of cuticular transpiration elaborated with a linear regression model. Results also show that cuticular transpiration of <em>in vitro</em> grown plants may be relevant and is strongly influenced by the genotype. Similarly, the sensitivity of plantlets to transplantation from <em>in vitro</em> to <em>in vivo</em> conditions may be strongly related by the genotype.</p>

Effects of atmospheric CO2 enrichment and root restriction on leaf gas exchange and growth of banana (Musa)

1996 ◽  
Vol 97 (4) ◽  
pp. 685-693
Author(s):  
B. Schaffer ◽  
C. Searle ◽  
A. W. Whiley ◽  
R. J. Nissen
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Co2 Enrichment ◽  
Atmospheric Co2 ◽  
Root Restriction

The Effects of Drought on Leaf Gas Exchange and Growth of Three Species of Herbaceous Perennials

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 540a-540
Author(s):  
K.J. Prevete ◽  
R.T. Fernandez
Keyword(s):  
Drought Stress ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Drought Tolerance ◽  
Transpiration Rate ◽  
Leaf Gas Exchange ◽  
Gas Analysis ◽  
Herbaceous Perennials ◽  
Effects Of Drought ◽  
Analysis System

Three species of herbaceous perennials were tested on their ability to withstand and recover from drought stress periods of 2, 4, and 6 days. Eupatorium rugosum and Boltonia asteroides `Snowbank' were chosen because of their reported drought intolerance, while Rudbeckia triloba was chosen based on its reported drought tolerance. Drought stress began on 19 Sept. 1997. Plants were transplanted into the field the day following the end of each stress period. The effects of drought on transpiration rate, stomatal conductance, and net photosynthetic rate were measured during the stress and throughout recovery using an infrared gas analysis system. Leaf gas exchange measurements were taken through recovery until there were no differences between the stressed plants and the control plants. Transpiration, stomatal conductance, and photosynthesis of Rudbeckia and Boltonia were not affected until 4 days after the start of stress. Transpiration of Eupatorium decreased after 3 days of stress. After rewatering, leaf gas exchange of Boltonia and Rudbeckia returned to non-stressed levels quicker than Eupatorium. Growth measurements were taken every other day during stress, and then weekly following transplanting. Measurements were taken until a killing frost that occurred on 3 Nov. There were no differences in the growth between the stressed and non-stressed plants in any of the species. Plants will be monitored throughout the winter, spring, and summer to determine the effects of drought on overwintering capability and regrowth.

scholarly journals Detrended Multiple Cross-Correlation Coefficient applied to solar radiation, air temperature and relative humidity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Andrea de Almeida Brito ◽  
Heráclio Alves de Araújo ◽  
Gilney Figueira Zebende
Keyword(s):  
Relative Humidity ◽  
Solar Radiation ◽  
Solar Energy ◽  
Correlation Coefficient ◽  
Air Temperature ◽  
Cross Correlation ◽  
Global Solar Radiation ◽  
Meteorological Variables ◽  
Hourly Data ◽  
Cross Correlations

AbstractDue to the importance of generating energy sustainably, with the Sun being a large solar power plant for the Earth, we study the cross-correlations between the main meteorological variables (global solar radiation, air temperature, and relative air humidity) from a global cross-correlation perspective to efficiently capture solar energy. This is done initially between pairs of these variables, with the Detrended Cross-Correlation Coefficient, ρDCCA, and subsequently with the recently developed Multiple Detrended Cross-Correlation Coefficient, $${\boldsymbol{DM}}{{\boldsymbol{C}}}_{{\bf{x}}}^{{\bf{2}}}$$DMCx2. We use the hourly data from three meteorological stations of the Brazilian Institute of Meteorology located in the state of Bahia (Brazil). Initially, with the original data, we set up a color map for each variable to show the time dynamics. After, ρDCCA was calculated, thus obtaining a positive value between the global solar radiation and air temperature, and a negative value between the global solar radiation and air relative humidity, for all time scales. Finally, for the first time, was applied $${\boldsymbol{DM}}{{\boldsymbol{C}}}_{{\bf{x}}}^{{\bf{2}}}$$DMCx2 to analyze cross-correlations between three meteorological variables at the same time. On taking the global radiation as the dependent variable, and assuming that $${\boldsymbol{DM}}{{\boldsymbol{C}}}_{{\bf{x}}}^{{\bf{2}}}={\bf{1}}$$DMCx2=1 (which varies from 0 to 1) is the ideal value for the capture of solar energy, our analysis finds some patterns (differences) involving these meteorological stations with a high intensity of annual solar radiation.

scholarly journals Grapevine species from varied native habitats exhibit differences in embolism formation/repair associated with leaf gas exchange and root pressure

2015 ◽  
Vol 38 (8) ◽  
pp. 1503-1513 ◽  
Author(s):  
THORSTEN KNIPFER ◽  
ASHLEY EUSTIS ◽  
CRAIG BRODERSEN ◽  
ANDREW M. WALKER ◽  
ANDREW J. MCELRONE
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Root Pressure ◽  
Native Habitats

scholarly journals Effects of trees, gardens, and nature trails on heat index and child health: design and methods of the Green Schoolyards Project

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Kevin Lanza ◽  
Melody Alcazar ◽  
Deanna M. Hoelscher ◽  
Harold W. Kohl
Keyword(s):  
Physical Activity ◽  
United States ◽  
Relative Humidity ◽  
Air Temperature ◽  
The United States ◽  
Heat Index ◽  
Activity Levels ◽  
Natural Setting ◽  
Physical Activity Levels ◽  
Nature Trails

Abstract Background Latinx children in the United States are at high risk for nature-deficit disorder, heat-related illness, and physical inactivity. We developed the Green Schoolyards Project to investigate how green features—trees, gardens, and nature trails—in school parks impact heat index (i.e., air temperature and relative humidity) within parks, and physical activity levels and socioemotional well-being of these children. Herein, we present novel methods for a) observing children’s interaction with green features and b) measuring heat index and children’s behaviors in a natural setting, and a selection of baseline results. Methods During two September weeks (high temperature) and one November week (moderate temperature) in 2019, we examined three joint-use elementary school parks in Central Texas, United States, serving predominantly low-income Latinx families. To develop thermal profiles for each park, we installed 10 air temperature/relative humidity sensors per park, selecting sites based on land cover, land use, and even spatial coverage. We measured green features within a geographic information system. In a cross-sectional study, we used an adapted version of System for Observing Play and Recreation in Communities (SOPARC) to assess children’s physical activity levels and interactions with green features. In a cohort study, we equipped 30 3rd and 30 4th grade students per school during recess with accelerometers and Global Positioning System devices, and surveyed these students regarding their connection to nature. Baseline analyses included inverse distance weighting for thermal profiles and summing observed counts of children interacting with trees. Results In September 2019, average daily heat index ranged 2.0 °F among park sites, and maximum daily heat index ranged from 103.4 °F (air temperature = 33.8 °C; relative humidity = 55.2%) under tree canopy to 114.1 °F (air temperature = 37.9 °C; relative humidity = 45.2%) on an unshaded playground. 10.8% more girls and 25.4% more boys interacted with trees in September than in November. Conclusions We found extreme heat conditions at select sites within parks, and children positioning themselves under trees during periods of high heat index. These methods can be used by public health researchers and practitioners to inform the redesign of greenspaces in the face of climate change and health inequities.

scholarly journals An improved theory for calculating leaf gas exchange more precisely accounting for small fluxes

Nature Plants ◽  
2021 ◽  
Author(s):  
Diego A. Márquez ◽  
Hilary Stuart-Williams ◽  
Graham D. Farquhar
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange
Sign in / Sign up

Export Citation Format

Share Document