Orchids, with their astonishingly stunning flowers, dominate the international floricultural market. They are considered prized assets for commercial applications in pharmaceutical and floricultural industries as they possess high therapeutic properties and superior ornamental values. The alarming depletion of orchid resources due to excessive unregulated commercial collection and mass habitat destruction makes orchid conservation measures an extreme priority. Conventional propagation methods cannot produce adequate number of orchids, which would meet the requirement of these ornamental plants for commercial and conservational purposes. In vitro orchid propagation using semi-solid media offers an outstanding prospect of rapidly producing quality plants on a large scale. However, the semi-solid (SS) system has shortcomings with low multiplication rates and high production costs. Orchid micropropagation using a temporary immersion system (TIS) overcomes the limitations of the SS system by reducing production costs and making scaleup and full automation possible for mass plant production. The current review highlights different aspects of in vitro orchid propagation using SS and TIS and their benefits and drawbacks on rapid plant generation.
This study aimed to evaluate the effects of soil fertilization and texture on leaf Boron (B) accumulation and its relation with wood volume of Corymbia citriodora Hill & Johnson. The experiment was set in randomized block with four replications, four B fertilization levels (0, 1.1, 2.2 and 4.4 g.plant-1) in two soils types (sandy and clayey). To determine leaf B content, 25 leaves were collected from the median portion of four trees for each treatment. Leaves were dried on oven and B content was determined by the Azomethine-H method using extract obtained by dry digestion. The diameter at breast height and the total height of 25 trees were collected in all treatments and wood volume was calculated. Data were submitted to analysis of variance and the means adjusted to regression equations. The regression coefficients were evaluated by t-test at 1 and 5% probability. It was verified that clay soil produces more wood, compared to sandy soil. There was a gain increase in foliar B as B doses increased in both soil types. Leaf B affected Corymbia citriodora productivity only in clay soil.
Background and Aims Calcium (Ca) plays an important role to increase drought tolerance in plants. We evaluated the effect of water restriction and Ca supply on the expression of Ca transporters, on Ca acquisition, allocation and its effects in eucalypt responses to drought. Methods Drought-tolerant eucalyptus plants (Eucalyptus urophylla x Eucalyptus camaldulensis - clone VM01) were grown in a hydroponic system in the presence or absence of Ca and subjected or not to water restriction using polyethylene glycol. Ca concentration by plants, gas exchange, plant growth, and the expression of the ACA11 and MCA1 Ca transporters were evaluated. Results Water restriction increased the expression of ACA11 (vacuole Ca transporter) and decreased the expression of MCA1(endodermal Ca transporter), in eucalypt roots. Water restriction increased Ca content in plant roots and Ca supply ameliorated the negative effects of water stress. Conclusion Water restriction alters the expression of Ca transporters in eucalypt roots altering the Ca allocation pattern and improving root growth and water status. Although caution must be taken, our findings bring novel evidence of an important mechanism that favors survival of drought-tolerant woody plants under water deficit.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.