A5082071787- Plant Physiology and Cultivation Studies
- Postharvest Quality and Shelf Life Management
- Plant Water Relations and Carbon Dynamics
- Flowering Plant Growth and Cultivation
- Horticultural and Viticultural Research
- Plant Stress Responses and Tolerance
- Botanical Research and Applications
- Plant Pathogens and Fungal Diseases
- Greenhouse Technology and Climate Control
- Plant Surface Properties and Treatments
- Plant responses to elevated CO2
- Plant and animal studies
- Tree Root and Stability Studies
- Plant and Biological Electrophysiology Studies
- Light effects on plants
- Plant responses to water stress
- Soil and Unsaturated Flow
- Leaf Properties and Growth Measurement
- Photosynthetic Processes and Mechanisms
- Agricultural Practices and Plant Genetics
- Essential Oils and Antimicrobial Activity
- Plant Diversity and Evolution
- Growth and nutrition in plants
- Irrigation Practices and Water Management
- Plant Reproductive Biology
Graduate School Experimental Plant Sciences
1978-2019
Wageningen University & Research
2005-2018
The direct effect of fluid composition on xylem hydraulic conductance is investigated in excised stem segments chrysanthemum (Dendranthema× grandiflorum Tzvelev cv. Cassa) plants. Dynamic changes are accurately measured at 30 s intervals before and after modifications the standard (deionized water). It whether osmotic properties flowing solution influence overall by affecting vessel‐to‐vessel pit membranes, as has previously been suggested. Various iso‐osmotic salt solutions (20 mOsm kg−1)...
Exposing plants to low VPD reduces leaf capacity maintain adequate water status thereafter. To find the impact of on functioning stomata, stomatal morphology and anatomy, fava bean were grown at (L, 0.23 kPa ) or moderate (M, 1.17 VPDs some that developed their leaves then transferred for 4 days (M→L). Part M→L‐plants sprayed with ABA (abscisic acid) during exposure L. L‐plants showed bigger larger pore area, thinner less spongy cells compared M‐plants. Stomatal (except aperture) anatomy...
Stomatal responses to closing stimuli are disturbed after long-term exposure of plants low vapour pressure deficit (VPD). The mechanism behind this disturbance is not fully understood. Genetic variation between naturally occurring ecotypes can be helpful elucidate the controlling stomatal movements in different environments. We characterized 41 natural accessions Arabidopsis thaliana (ABA and desiccation) they had been exposed for 4 days moderate VPD (1.17 kPa) or (0.23 kPa). A fast...
We constructed the first integrated genetic linkage map in a polysomic hexaploid. This enabled us to estimate inheritance of parental haplotypes offspring and detect multi-allelic QTL. Construction use maps are challenging hexaploids with inheritance. Full integration requires calculations recombination frequency between markers complex segregation types. In addition, detection QTL information on all six alleles at one locus for each individual. describe method that we used construct fully...
Plants produced at high relative air humidity (RH) show poor control of water loss after transferring to low RH, a phenomenon which is thought be due their stomatal behaviour. The anatomy and responses moderate (55%) (90%) RH grown Tradescantia virginiana plants treatments that normally induce closure, i.e. desiccation, abscisic acid (ABA) application exposure darkness were studied using attached or detached young, fully expanded leaves. Compared with the transpiration rate, conductance...
In this study, the role of abscisic acid (ABA) in altered stomatal responses Tradescantia virginiana leaves grown at high relative air humidity (RH) was investigated. A lower ABA concentration found RH compared with moderate RH. As a result daily application 20 μM to for 3 weeks during growth RH, stomata ABA-treated showed same behaviour as did For example, they closed rapidly when exposed desiccation. Providing around single leaf plant changed leaf. The not close completely response...
The spatial heterogeneity of stomatal closure in response to rapid desiccation excised well-watered Tradescantia virginiana leaves grown at moderate (55%) or high (90%) relative air humidity (RH) was studied using a chlorophyll fluorescence imaging system under non-photorespiratory conditions. Following desiccation, RH had both greater and higher average value PSII efficiency (ΦPSII) compared with RH. Larger decreases water content resulted smaller potential ΦPSII RH-grown leaves. Moreover,...
Vase life (VL) tests on cut roses obtained from commercial sources were conducted at FloraHolland. Water stress symptoms the most important criterion terminating VL in 46 out of 50 assessed cultivars. These appear when water loss exceeds uptake. Inadequate control during postharvest period, therefore, limits VL. Here we review link between preharvest conditions and phase, discuss how evaluation protocol may affect outcome. Key cultivation-related environmental factors affecting stomatal...
Abstract The role of nitric oxide (NO) in abscisic acid (ABA)-induced stomatal closure is a matter debate. We conducted experiments Vicia faba leaves using NO gas and sodium nitroprusside (SNP), NO-donor compound, compared their effects to those ABA. In epidermal strips, was induced by ABA but not NO, casting doubt on the ABA-mediated closure. Leaf discs intact showed dual dose response NO: aperture widened at low dosage narrowed high dosage. Overcoming resistance means CO2 concentration...
In this study xylem hydraulic resistances of peduncles (truss stalk), pedicels (fruit stalk) and the future abscission zone (AZ) halfway along pedicel tomato (Lycopersicon esculentum L.) plants were directly measured at different stages fruit development, in grown under two levels water availability root environment. The connection between shoot fruits has previously been investigated, but contradictory conclusions drawn about presence a flow resistance barrier pedicel. These all based on...
Chlorophyll fluorescence imaging was used to measure stomatal closure in response desiccation of Tradescantia virginiana leaves grown under high (90%) and moderate (55%) relative humidities (RHs), or transferred between these humidities. Stomata at RH were less responsive than those RH. plants from conditions showed the same diminished as did stomata that developed This found both when fully expanded still actively expanding during pre-treatment. Four days exposure minimal time induce...
A new method is presented that enables the induction of embolisms in a fraction all xylem vessels, based on diameter, at one cut end stem segment. The different capillary characteristic vessels cross‐sectional size. To verify method, air were induced chrysanthemum (Dendranthema×grandiflorum Tzvelev cv. Cassa) segments tensions and compared with distribution gas‐filled as visualized by cryo‐scanning electron microscopy (Cryo‐SEM). At −6 kPa pressure, air‐entrance was only large diameter (>30...
The ethylene evolution from 3 cm‐long flower buds of Lilium X ‘Enchantment’ increased when the plants were placed in darkness. Also shortening daily light period led to an increase buds. Dark‐enhanced could only be evoked between 2 and 3.5 cm long. Flower bud abscission induced by dakrness prevented injecting silver thiosulphate into buds, or using grown bulbs previously immersed a solution. It is suggested that light‐controlled mediated ethylene, darkness consequence influence on action...
The stem xylem conduit dimensions and hydraulic conductivity of chrysanthemum plants (Dendranthema×grandiflorum Tzvelev cv. Cassa) were analysed quantified. Simple exponential relations describe length distribution, height dependency conductivity. These mathematical descriptions can be used to model the water transport system. Within a 1.0 m, half‐length (the within which 50% conduits have their end) was 0.029 m at soil surface decreased by half 0.6 m. With each 0.34 increase in up stem,...