Experimental Ecology of Dryas octopetala Ecotypes. III. Environmental Factors and Plant Growth

1985 ◽  
Vol 17 (3) ◽  
pp. 229 ◽  
Author(s):  
James B. McGraw
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Dryas Octopetala ◽  
Experimental Ecology

scholarly journals Hukum Minimum Liebig - Sebuah Ulasan dan Aplikasi Dalam Biologi Kontemporer

2018 ◽  
Vol 18 (1) ◽  
pp. 28 ◽  
Author(s):  
Wendy Achmmad Mustaqim
Keyword(s):  
Biological Sciences ◽  
Climate Change ◽  
Environmental Factors ◽  
Plant Growth ◽  
Ecological Factors ◽  
Short Review ◽  
Ecological Indicator ◽  
Half Century

Optimum plant growth depends on numerous ecological factors. In relation to this theme, there is an old law called Law of the Minimum Liebig. The postulate discussed the growth of the plant that is determined by the scarcest environmental factors. It is one of the oldest ecological postulate proposed more than one and a half-century ago. It has become one of the most important foundations for agriculture and biology, even the in contemporary biology. This short review will provide the history, principles, development and criticism, and applications in some recent biological sciences, including evolution, conservation, ecological indicator and even climate change.

scholarly journals Plant Growth Promotion Potential Is Equally Represented in Diverse Grapevine Root-Associated Bacterial Communities from Different Biopedoclimatic Environments

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
Ramona Marasco ◽  
Eleonora Rolli ◽  
Marco Fusi ◽  
Ameur Cherif ◽  
Ayman Abou-Hadid ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Bacterial Communities ◽  
Growth Promotion ◽  
Rrna Gene ◽  
Similar Distribution ◽  
Bacterial Assemblage ◽  
Pgp Traits ◽  
Associated Bacteria

Plant-associated bacteria provide important services to host plants. Environmental factors such as cultivar type and pedoclimatic conditions contribute to shape their diversity. However, whether these environmental factors may influence the plant growth promoting (PGP) potential of the root-associated bacteria is not widely understood. To address this issue, the diversity and PGP potential of the bacterial assemblage associated with the grapevine root system of different cultivars in three Mediterranean environments along a macrotransect identifying an aridity gradient were assessed by culture-dependent and independent approaches. According to 16S rRNA gene PCR-DGGE, the structure of endosphere and rhizosphere bacterial communities was highly diverse (P=0.03) and was associated with a cultivar/latitudinal/climatic effect. Despite being diverse, the bacterial communities associated with Egyptian grapevines shared a higher similarity with the Tunisian grapevines than those cultivated in North Italy. A similar distribution, according to the cultivar/latitude/aridity gradients, was observed for the cultivable bacteria. Many isolates (23%) presentedin vitromultiple stress resistance capabilities and PGP activities, the most frequent being auxin synthesis (82%), insoluble phosphate solubilisation (61%), and ammonia production (70%). The comparable numbers and types of potential PGP traits among the three different environmental settings indicate a strong functional homeostasis of beneficial bacteria associated with grape root.

scholarly journals Domestication De Thunbergia Atacorensis Akoegninou & Lisowski (Acanthaceae) : Effet Du Type De Substrat Et Du Mode D’eclairement Sur L’aptitude A La Reprise Vegetative Des Boutures Et La Croissance Des Plants

2017 ◽  
Vol 13 (18) ◽  
pp. 328
Author(s):  
Asseh Ebah Estelle ◽  
Ake-Assi Emma ◽  
Koffi Kouao Jean ◽  
Kouassi Akossoua Faustine ◽  
N’guessan Kouakou Edouard
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Significant Influence ◽  
Vegetative Reproduction ◽  
Seedling Production ◽  
Optimal Conditions ◽  
Cultivation Conditions ◽  
Rate Of Recovery ◽  
Number Of Leaves ◽  
Sun And Shade

We studied the possibility of producing seedlings of Thunbergia atacorensis (Acanthaceae) starting from cuttings under controlled cultivation conditions during 3 months. The objective of this work is to determine the optimal conditions for seedling production Thunbergia atacorensis by vegetative reproduction to allow its extension from professional growers and amateur (consumers). The study consisted to analyze their effect the plant growth, seedlings development, and leaves production. At the end the study, we obtained a rate of 91p.c for vegetative recovery for the cutting in shade 97p.c. for the cutting exposing to sun. However, the cuttings exposed sun clearly dissociates cuttings exposed to the shade with a shorter time of recovery. At the end of 3 months, only the sunny seedlings survive despite of the recovery rate of recovery. The study showed that the four environmental factors, the mode of exposure (sun and shade) and time (weeks) have a significant influence on the height and the number of seedlings leaves. The highest seedlings are observed in the shade from weeks 1 to 3. From week 3, only the sunny seedlings continue their growth and their development. The variation of the substrate and the frequency of watering, meanwhile, had no significant influence on the height and number of leaves. In sum, despite of lack of flowering, to produce seedlings of Thunbergia atacorensis, one should initially carry out the propagation by cutting in the shade and then to gradually intensify the light to have well developed seedlings.

scholarly journals Light modulates the gravitropic responses through organ-specific PIFs and HY5 regulation ofLAZY4expression inArabidopsis

2020 ◽  
Vol 117 (31) ◽  
pp. 18840-18848 ◽  
Author(s):  
Panyu Yang ◽  
Qiming Wen ◽  
Renbo Yu ◽  
Xue Han ◽  
Xing Wang Deng ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Environmental Factors ◽  
Plant Growth ◽  
Molecular Basis ◽  
Control Plant ◽  
Protein Levels ◽  
Positive Regulator ◽  
Regulatory Module ◽  
Organ Specific ◽  
Negative Gravitropism

Light and gravity are two key environmental factors that control plant growth and architecture. However, the molecular basis of the coordination of light and gravity signaling in plants remains obscure. Here, we report that two classes of transcription factors, PHYTOCHROME INTERACTING FACTORS (PIFs) and ELONGATED HYPOCOTYL5 (HY5), can directly bind and activate the expression ofLAZY4, a positive regulator of gravitropism in both shoots and roots inArabidopsis. In hypocotyls, light promotes degradation of PIFs to reduceLAZY4expression, which inhibits the negative gravitropism of hypocotyls.LAZY4overexpression can partially rescue the negative gravitropic phenotype ofpifqin the dark without affecting amyloplast development. Our identification of the PIFs-LAZY4regulatory module suggests the presence of another role for PIF proteins in gravitropism, in addition to a previous report demonstrating that PIFs positively regulate amyloplast development to promote negative gravitropism in hypocotyls. In roots, light promotes accumulation of HY5 proteins to activate expression ofLAZY4, which promotes positive gravitropism in roots. Together, our data indicate that light exerts opposite regulation ofLAZY4expression in shoots and roots by mediating the protein levels of PIFs and HY5, respectively, to inhibit the negative gravitropism of shoots and promote positive gravitropism of roots inArabidopsis.

Chloronicotinyl insecticide imidacloprid: agricultural relevance, pitfalls and emerging opportunities

2019 ◽  
Author(s):  
Thabiso Motaung
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Seed Treatment ◽  
Agricultural Pests ◽  
Synthetic Compounds ◽  
Beneficial Insects ◽  
Field Crops ◽  
Negative Impacts ◽  
Selection Agent ◽  
Abiotic Environmental Factors

Imidacloprid’s relationship with agriculture is often viewed in terms of protection of field crops against a range of devastating pests. But beyond this, applications – foliar spraying, soil and seed treatment – have become synonymous with the negative impacts on beneficial insects including pollinators and the natural enemies of agricultural pests, and environmental contamination. The present paper reviews some of the vital properties and other key related aspects making imidacloprid agriculturally relevant. It also draws attention to the use of this compound in early plant growth to enhance resistance to pests, pathogens and abiotic environmental factors, as either a priming or selection agent. In cementing this proposal, metabolites and synthetic compounds similar to imidacloprid are used to illuminate neonicotinoid-driven priming/selection potential for integrating robust responses in, and for, plants to be better armed for future hostile encounters.

Sign in / Sign up

Export Citation Format

Share Document