scholarly journals ASSESSMENT OF PHYSIOLOGICAL AND MORPHOLOGICAL TRAITS OF PLANTS OF THE GENUS Fragaria UNDER CONDITIONS OF WATER DEFICIT – A STUDY REVIEW

2020 ◽  
Vol 19 (1) ◽  
pp. 21-39
Author(s):  
Marta Rokosa ◽  
Małgorzata Mikiciuk
Keyword(s):  
Water Deficit ◽  
Plant Species ◽  
High Water ◽  
Temperate Climate ◽  
Future Research ◽  
High Water Content ◽  
Species Response ◽  
Influence Of Water ◽  
Specific Species ◽  
Response To Water

The genus Fragaria belongs to the Rosaceae family. The most popular representatives of this species are the strawberry (Fragaria × ananassa Duch.) and wild strawberry (Fragaria vesca L.), whose taste and health benefits are appreciated by a huge number of consumers. The cultivation of Fragaria plants is widespread around the world, with particular emphasis on the temperate climate zone. Increasingly occurring weather anomalies, including drought phenomena, cause immense losses in crop cultivation. The Fragaria plant species are very sensitive to drought, due to the shallow root system, large leaf area and the high water content of the fruit. There have been many studies on the influence of water deficit on the morphological, biochemical and physiological features of strawberries and wild strawberries. There is a lack of research summarizing the current state of knowledge regarding of specific species response to water stress. The aim of this study was to combine and compare data from many research carried out and indicate the direction of future research aimed at improving the resistance of Fragaria plants species to stress related to drought. These plants show patterns of response to stress caused by drought, such as: osmotic adjustment, reduction of transpiration and photosynthesis, and increased efficiency of water use. Drought also causes significant changes in the composition and palatability of the fruit of the Fragaria plant species.

scholarly journals Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Hoehnea ◽  
2019 ◽  
Vol 46 (4) ◽  
Author(s):  
Rodrigo Fazani Esteves Sanches ◽  
Ana Paula Oliveira da Silva ◽  
Vanessa Pires da Costa ◽  
Maria Ângela Machado de Carvalho ◽  
Emerson Alves da Silva
Keyword(s):  
Water Deficit ◽  
Osmotic Adjustment ◽  
Water Status ◽  
Soluble Sugars ◽  
Water Suppression ◽  
Adaptive Responses ◽  
Close Relationship ◽  
Relative Water ◽  
Influence Of Water ◽  
Response To Water

ABSTRACT Water stress is an environmental factor that can regulate growth, limit production and lead to physiological and biochemical changes. Plants present a series of adaptive responses to drought, such as osmotic adjustment, in which carbohydrates play an important role. To evaluate the influence of water deficit on carbohydrates accumulation in V. discolor, the plants were divided into two groups: daily watering and water suppression for 14 days being re-watering after this period. Leaves and roots were collected at 0, 3, 6, 9, 12, 15 and 18 days, for ecophysiological and biochemical analyzes. Variations in carbohydrate contents in V. discolor showed a close relationship with changes in the plant water status, with higher concentrations of soluble sugars, total fructans, oligosaccharides, reducing sugars coinciding with the lower values of soil moisture and leaf water potentials and relative water content. In the tuberous roots, there is an increase in carbohydrate concentrations after re-watering. The increase of these low molecular weight carbohydrates is involved in osmotic adjustment and therefore acts to protect against dehydration.

Seasonal changes in the diet of the European rabbit (Oryctolagus cuniculus) from three different Mediterranean habitats in south-western Australia

2007 ◽  
Vol 34 (1) ◽  
pp. 25 ◽  
Author(s):  
Gary R. Martin ◽  
Laurie E. Twigg ◽  
Lina Zampichelli
Keyword(s):  
Plant Species ◽  
Western Australia ◽  
Seasonal Changes ◽  
Summer Rainfall ◽  
High Water ◽  
European Rabbit ◽  
High Water Content ◽  
Food Groups ◽  
Food Items ◽  
Remnant Vegetation

Abstract.�Seasonal changes in the diet of rabbits from three temperate (Mediterranean) areas in south-western Australia were identified using microscopic determination of the percentage occurrence of various food groups in sampled stomachs. The sites differed in soil type and in the availability of summer perennials, native vegetation bush remnants (size of, and number of plant species), improved pastures, and summer rainfall, and hence, enabled a comparison of the diet of rabbits from the different vegetation communities. Although the diet of these rabbits was quite flexible, with some switching in food items occurring between seasons, there were marked differences in the proportion of monocotyledonous and dicotyledonous species eaten in each habitat. There was a strong reliance on seeds (1-5 species) during late spring and summer in all three habitats. Guildford grass (Romulea rosea) leaf and corms were a major component of the diet in the two habitats where this species was common. Further, as a result of the summer die-off of pasture species, there was a shift in where rabbits sourced food items during winter and summer. Pasture species were eaten during winter, but rabbits fed mainly on those dicotyledons found only in the surrounding scrub during summer. This suggests that rabbits may impact negatively upon such remnant vegetation at this time. Rabbits in all three habitats consumed several plant species with high water content (>54%) during summer, presumably to help maintain their water balance. Rabbits also consumed the seeds and foliage of several weed/nuisance species in each habitat, but any role of rabbits in weed dispersal was not determined.

scholarly journals Sugarcane Biochar as an Amendment for Greenhouse Growing Media for the Production of Cucurbit Seedlings

2018 ◽  
Vol 10 (2) ◽  
pp. 104 ◽  
Author(s):  
Charles L. Webber III ◽  
Paul M. White Jr ◽  
Douglas J. Spaunhorst ◽  
Isabel M. Lima ◽  
Eric C. Petrie
Keyword(s):  
Plant Species ◽  
High Water ◽  
Future Research ◽  
Seedling Production ◽  
Growing Media ◽  
Heating Value ◽  
Raw Sugar ◽  
Certified Organic ◽  
The Impact ◽  
Bagasse Biochar

Louisiana sugarcane farmers in 2016 harvested 11.7 million Mg millable sugarcane from 163,000 ha, producing 1.47 million Mg of raw sugar and an estimated 3.5 million Mg of bagasse. Even though Louisiana sugar mills use 80 to 90% of the bagasse for fuel production, another 350,000 to 700,000 Mg of bagasse accumulates each year. The conversion of the excess bagasse into biochar is an excellent option with numerous uses. Research was conducted to determine the impact of sugarcane biochar as an amendment to soilless planting media for the production of cucurbit seedlings. Two biochars were combined by volume with a commercial certified organic soilless growing media into 5 combinations (0%:100%, 25%:75%, 50%:50%, 75%:25%, and 100%:0%, biochars and growing media, respectively). Squash (Cucurbita pepo L.) var. ‘Enterprise’ and cantaloupe (Cucumis melo L.) var. ‘Magnum .45’ were planted in each of the 5 different planting mixtures. The higher heating value (HHV), lower heating value (LHV), and fixed carbon (FixC) were greater for the standard bagasse biochar (SBB), therefore, making it more valuable as a potential fuel source than the pneumatic bagasse biochar (PBB). All of the biochar mixture combinations compared favorably to the commercial media with low bulk densities (0.11 to 0.14 g cm-3) and high water holding capacities (80-87%). In respect to seedling production, the biochars (SBB and PBB) performed well, especially at the 25 and 50% levels for both plant species. The squash seedlings responded better at the 75% level than the cantaloupe seedlings, which reflect differences in nutrient requirements. The 100% biochar growing media are not recommended because both plant species often had a decrease in organic matter. These results indicate that the volume of a standard soilless greenhouse growing media can be successfully extended by adding 25 to 50% sugarcane biochar without a reduction in squash and cantaloupe seedling production. Future research should investigate the impact of additional plant species, as well as different biochar sources on seedling production.

Comparative foraging preferences of the greater stick-nest rat Leporillus conditor and the European rabbit Oryctolagus cuniculus: implications for regeneration of arid lands.

2003 ◽  
Vol 25 (2) ◽  
pp. 135 ◽  
Author(s):  
SA Ryan ◽  
KE Moseby ◽  
DC Paton
Keyword(s):  
Plant Species ◽  
Oryctolagus Cuniculus ◽  
Arid Zone ◽  
South Australia ◽  
High Water ◽  
European Rabbit ◽  
High Water Content ◽  
Shrub Species ◽  
Foraging Preferences ◽  
Acacia Aneura

Dietary preferences of the greater stick-nest rat (Leporillus conditor) and the European rabbit (Oryctolagus cuniculus) were compared using cafeteria trials and direct observations. Despite overlap, these species exhibited differences in dietary preference. L. conditor showed a strong preference for chenopod shrub species and other plant species with a high water content including Gunniopsis quadrifida and Calandrinia remota. L. conditor also preferred female bladder saltbush (Atriplex vesicaria) foliage to male. O. cuniculus ate a greater selection of plant species in most trials with their most preferred species including mulga (Acacia aneura), Salsola kali and Calandrinia remota. Both O. cuniculus and L. conditor preferred seedlings of perennial species to adult cuttings. L. conditor has recently been re-introduced to a 14 km� O. cuniculus, cat (Felis catus) and red fox (Vulpes vulpes) proof exclosure in the arid zone of South Australia. The re-introduction of this herbivore and the removal of exotic herbivores may change the vegetation structure and composition within the exclosure by restricting growth of some succulent chenopod species but allowing the regeneration of tall shrub species such as Acacia aneura which are usually limited by O. cuniculus grazing.

scholarly journals Influence of Leaf Physical Properties on Single-Leaf Vibrational Response to Sound

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 115
Author(s):  
Mengmeng Li ◽  
Jian Kang
Keyword(s):  
Physical Properties ◽  
Noise Reduction ◽  
Plant Species ◽  
Leaf Size ◽  
High Water ◽  
High Water Content ◽  
Vibrational Amplitude ◽  
Sound Stimulation ◽  
Single Leaf ◽  
Wide Range

Plant leaves respond to environmental sounds by vibration. This study aimed to examine such responses by evaluating the influences of physical properties on vibrational amplitude, velocity and frequency before and during sound stimulation. Nine plant species with a wide range of leaf sizes, qualities and thicknesses and petiole lengths, widths and thicknesses were selected. In the absence of external sound, the leaf amplitude was ~1 μm, the vibrational velocity was ~0.05 mm s-1 and the vibrational frequency was ~0–15 Hz. After sound stimulation, however, the amplitude increased by 1–5.4×, the velocity was 1.75–14.1× higher and produced another spectral peak at ~80–95 Hz. Nevertheless, the amplitude and velocity varied by up to 1–10× among species mainly because of differences in leaf texture. However, these factors did not markedly change in succulent leaves because their thick epidermal cuticles and high water content buffered vibrations. In contrast, leathery leaves and papery and membranous leaves were highly responsive to sound stimuli. Leaf size, mass and thickness and petiole length, width and thickness also influenced leaf vibration. There is a positive correlation between noise reduction and leaf velocity. Noise reduction effect increases with the increase in leaf velocity until about 0.6 mm s−1 and then decreases. The relationship between leaf physical properties and leaf vibration may be used to study sound response and noise reduction in different plant species.

scholarly journals Initial Growth and Compatible Solutes Concentration in Seedlings of two Genotypes of Psidium araca Raddi (Myrtaceae) in Response to Water Suppression

Gaia Scientia ◽  
2017 ◽  
Vol 11 (4) ◽  
Author(s):  
Hugo Rafael Bentzen Santos ◽  
Elizamar Ciríaco da Silva ◽  
Rejane Jurema Mansur Custódio Nogueira
Keyword(s):  
Water Deficit ◽  
Water Availability ◽  
Compatible Solutes ◽  
Shoot Formation ◽  
Water Suppression ◽  
Initial Growth ◽  
Physiological Characterization ◽  
Root Shoot Ratio ◽  
Influence Of Water ◽  
Response To Water

The physiological characterization of plants is of great importance to the selection of suitable genotypes tolerant of low water availability. Therefore, the aim of this study was to evaluate the influence of water deficit on growth and compatible solutes concentration of two genotypes of Psidium araca Raddi seedlings. The IPA 10/2 and IPA 16/2 genotypes behaved similarly in terms of number of leaves, stem diameter and the increase of root formation over shoot formation under water deficit. IPA 10/2 produced higher total dry matter; however, IPA 16/2 accession produced higher root-shoot ratio, carbohydrates and free proline contents, conferring to IPA 16/2 a greater ability to grow and survive in environments subjected to low water availability. Keywords: araça, biomass partitioning, carbohydrates, proline.

scholarly journals Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Menghan Wang ◽  
Jianzhong Bai ◽  
Kan Shao ◽  
Wenwei Tang ◽  
Xueling Zhao ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Functional Materials ◽  
Drug Carriers ◽  
High Water ◽  
Wound Dressings ◽  
Biological Aging ◽  
Future Research ◽  
Poly Vinyl Alcohol ◽  
High Water Content ◽  
Self Healing

Hydrogels have three-dimensional network structures, high water content, good flexibility, biocompatibility, and stimulation response, which have provided a unique role in many fields such as industry, agriculture, and medical treatment. Poly(vinyl alcohol) PVA hydrogel is one of the oldest composite hydrogels. It has been extensively explored due to its chemical stability, nontoxic, good biocompatibility, biological aging resistance, high water-absorbing capacity, and easy processing. PVA-based hydrogels have been widely investigated in drug carriers, articular cartilage, wound dressings, tissue engineering, and other intelligent materials, such as self-healing and shape-memory materials, supercapacitors, sensors, and other fields. In this paper, the discovery, development, preparation, modification methods, and applications of PVA functionalized hydrogels are reviewed, and their potential applications and future research trends are also prospected.

Influence of Water Content on the Strength of Silt Soil in Yellow River Alluvial Plain

2012 ◽  
Vol 256-259 ◽  
pp. 481-487
Author(s):  
Xiao Ming Yi ◽  
Song Gen Wang ◽  
Zhen Qing Liu ◽  
Gang Xu
Keyword(s):  
Elastic Modulus ◽  
Water Content ◽  
Yellow River ◽  
Friction Angle ◽  
Cohesive Soil ◽  
High Water ◽  
Alluvial Plain ◽  
High Water Content ◽  
Optimum Water Content ◽  
Influence Of Water

Hydrophilic characteristic of silt soil in Yellow River alluvial plain was studied in order to reveal the water content changes of silt. Then strength tests were used to research how engineering parameters such as elastic modulus, cohesion and friction angle change at different water content. The results show that high permeability coefficient and strong capillary are main factors to increase the water content, and the influence of capillary rising is greater than that of rainfall infiltration. The strength characteristic of silt soil is similar to the character of non-cohesive soil in low water content and that of clay in high water content. If the water content is greater than optimum water content, the elastic modulus and cohesion of silt shall decay obviously. Friction angle decreases dramatically as well, when the soil is saturated.

Features of spring feeding of sterlet of the middle course of the Northern Dvina river

2020 ◽  
pp. 8-17
Author(s):  
A. Bykov ◽  
D. Palatov ◽  
I. Studenov ◽  
D. Chupov
Keyword(s):  
Benthic Communities ◽  
High Water ◽  
Food Composition ◽  
Fish Growth ◽  
High Water Content ◽  
Feeding Intensity ◽  
Biting Midges ◽  
Size Groups ◽  
Main Components ◽  
A Minor

The article provides information about the features of spring feeding of sterlet in the spawning grounds of the middle course of the Northern Dvina river in may 2019. The main and secondary groups of forage objects in the diet of this species of sturgeon are characterized. The article considers the variability of the sterlet food composition with an increase in the size of fish from 30 to 60 cm. In the process of fish growth in the diet of the Severodvinsk sterlet, the main components in terms of occurrence and mass in all size groups are the larvae of Brooks and chironomids. A minor occurrence was the larvae of midges, biting midges, stoneflies, mayflies and small clams. To random and seasonal food are the larvae of water bugs, butterflies, flies, beetles and eggs of other fish. The feeding intensity of the smaller sterlet (30–40 cm) was significantly higher than that of the fish in the size groups 40–50 and 50–60 cm. Fundamental changes in the diet of the Severodvinsk sterlet for the main food objects for more than sixty years of observations have not been established. During periods of high water content of the Northern Dvina due to seasonal changes in the structure of benthic communities, the value of Brooks in the diet of sterlet increases and the proportion of chironomids decreases.

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