Floating system improves acclimatization of micropropagated pear plantlets

2021 ◽  
pp. 727-732
Author(s):  
D. Aleksandrova ◽  
N. Dimitrova ◽  
V. Nikolova ◽  
L. Nacheva
Keyword(s):  
2021 ◽  
pp. 111257
Author(s):  
Mouheb Sboui ◽  
Hinda Lachheb ◽  
Soraa Bouattour ◽  
Michelangelo Gruttadauria ◽  
Valeria La Parola ◽  
...  

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1168
Author(s):  
Dimitrios S. Kasampalis ◽  
Danai-Christina Aktsoglou ◽  
Pavlos Tsouvaltzis ◽  
Anastasios S. Siomos

A floating system was established in a heated glass greenhouse in order to investigate whether the effect of amino acids (0.25 or 0.50% of a commercial amino acid (AA) solution Amino16®) during peppermint and spearmint production on plant developmental and nutritional status may be in part attributed to salinity induced osmotic stress. For this reason, in some nutrient solutions, three levels of salinity were induced by adding 0, 10, or 20 mM NaCl. According to the results, it can be concluded that spearmint is mostly favored by the highest amino acid supplement of the nutrient solution (0.50%) in terms of a substantial improvement of the antioxidant nutritional quality (by up to 130%) at the expense of a reduced biomass production (by <30%). Enzymic antioxidant defense mechanism (APX and POD) was efficiently activated, preventing severe lipid peroxidation and the accumulation of reactive oxygen species such as H2O2 and maintaining the proline content at the normal levels. The osmotic stress that was induced by the excessive AA concentration and confirmed by the chlorophyl fluorescence variations was probably related to NH4+ excess supply in the growing media and was not associated with the elevated electrical conductivity in the solution. The absence of any adverse stressful consequences upon the addition of 20 mM NaCl may be attributed to the high salt tolerance of peppermint and spearmint species.


2019 ◽  
Vol 246 ◽  
pp. 907-915 ◽  
Author(s):  
Almudena Giménez ◽  
Juan A. Fernández ◽  
José A. Pascual ◽  
Margarita Ros ◽  
Matías López-Serrano ◽  
...  
Keyword(s):  

2011 ◽  
Vol 480-481 ◽  
pp. 1496-1501
Author(s):  
Liu Hui

In order to study the dynamic characteristics of a super-long-span cable-stayed bridge which is semi-floating system, the spatial finite element model of this cable-stayed bridge was established in ANSYS based on the finite element theory.Modal solution was conducted using subspace iteration method, and natural frequencies and vibration modes were obtained.The dynamic characteristics of this super-long-span cable-stayed bridge were then analyzed.Results showed that the super-long-span cable-stayed bridge of semi-floating system has long basic cycle, low natural frequencies, dense modes and intercoupling vibration modes.


Irriga ◽  
2017 ◽  
Vol 22 (2) ◽  
pp. 301-313
Author(s):  
Patricia Angelica Alves Marques ◽  
Gabriel Blair Fontinelle ◽  
Alexandre Gibau de Lima ◽  
Jefferson Vieira José ◽  
Hermes Soares Da Rocha ◽  
...  

ARTEMISIA SEEDLINGS QUALITY PRODUCED IN GREENHOUSE UNDER DIFFERENT IRRIGATION SYSTEM AND FERTILIZER DOSES PATRICIA ANGÉLICA ALVES MARQUES¹; GABRIEL BLAIR FONTINELLE¹; ALEXANDRE GIBAU DE LIMA¹; JEFFERSON VIEIRA JOSÉ2*; HERMES SOARES DA ROCHA3 E DANIEL SOARES ALVES4 [1]Department of Biosystems Engineering, University of Sao Paulo/ESALQ, C.P. 09 – 13418-900 – Piracicaba, SP – Brazil. E-mail: [email protected], [email protected], [email protected], 2Department of Agricultural and Environmental Engineering, Institute of Agricultural Sciences and Technology, Federal University of Mato Grosso, C.P. 78735-910 – Rondonópolis, MT – Brazil.  E-mail: [email protected] of Agrarian Sciences, Federal University of the Jequitinhonha and Mucuri Valleys, C.P. 38610-000 – Unaí, MG – Brazil. E-mail: [email protected] of Agricultural Engineering, Estate University of Mato Grosso, C.P. 78300-000 – Tanagra da Serra MT – Brazil.  E-mail: [email protected]  1 ABSTRACT The Artemisia annua L. is a source of essential oils used in perfumery and cosmetics industry, and the yield of oil is affected by the quality of the seedlings used. The present study was carried out in order to evaluate the production of Artemisia annua L. seedlings grown in greenhouse, under two irrigation systems and four levels of commercial fertilizer of high solubility, in a completely randomized design in a 2x4 factorial arrangement and four replications. Germination and growth of roots and shoots seedlings (stems and leaves) were assessed. It was observed at 36 days of sowing (DAS), that plant height was 743% higher on floating system than plants under micro sprinkler system, and that the relationship between root’s and shoot’s dry matter is inversely proportional to the doses of nutrient solution applied. Seedlings showed Dickson quality index greater than 1.3 for all the doses of fertilizer under the floating system. On the other hand, values less than 0.6 were observed for plants under micro sprinkler system. Keywords: seedling production; floating system; medicinal plants irrigation  MARQUES, P. A. A; FONTINELLE, G. B.; LIMA, A. G.; JOSÉ, J. V.; ROCHA, H. S.; ALVES, D. SQUALIDADES DE MUDAS DE ARTEMISIA PRODUZIDAS EM CASA DE VEGETAÇÃO SUBMETIDAS A DIFERENTES SISTEMAS DE IRRIGAÇAO E DOSES DE FERTILIZANTES  2 RESUMO A Artemisia annua L. é uma fonte de óleos essenciais utilizados na indústria de perfumaria e cosméticos, e o rendimento do óleo é afetado pela qualidade das mudas. O presente estudo foi realizado para avaliar a produção de mudas de Artemisia annua L. cultivadas em casa de vegetação, sob dois sistemas de irrigação e quatro níveis de fertilizante comercial de alta solubilidade, em um delineamento experimental inteiramente aleatorizado, em esquema fatorial 2x4 e quatro repetições. Foram avaliados a germinação e o crescimento das mudas de raízes e parte aérea (caule e folhas). Foi observado aos 36 dias após a semeadura (DAS) que a altura das plantas era 743% maior no sistema de flutuação do que das plantas sob microaspersão, e que a relação entre massa seca da raiz/massa seca da parte aérea foi inversamente proporcional às doses de solução nutritiva aplicada. As mudas apresentaram índice de qualidade de Dickson superior a 1,3 para todas as doses de fertilizante no sistema flutuante. Por outro lado, valores inferiores a 0,6 foram observados para as plantas sob microaspersão. Palavras-chave: produção de mudas; floating system; irrigação de plantas medicinais


2019 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
John Afokoghene Avbunudiogba ◽  
Christian Arerusuoghene Alalor ◽  
Queen Dorcas Okolocha

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