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Influences of ascorbic acid and gibberellic acid in alleviating effects of salinity in Petunia under in vitro

Phyton-International Journal of Experimental botany 2019年第1期88卷 15-23页

作者： Krupa-Małkiewicz M b smolik M Sędzik Department of Plant Genetics Breeding and BiotechnologyWest Pomeranian University of Technology in SzczecinSłowackiego str.71-434 SzczecinPoland Department of Plant Physiology and biochemistry West Pomeranian University of Technology in SzczecinSłowackiego str.71-434 SzczecinPoland

Salinity is one of the abiotic stresses that limits the growth and productivity of many crops.A possible survival strategy for plant under saline conditions is to use compounds that could minimize the harmful effects of salt stress on the plant development.The objective of the presented study was to investigate the effect of exogenous ascorbic acid(ASA)with or without gibberellic acid(GA3)on key growth and biochemical parameters in two petunia cultivars‘Prism Rose’and‘Prism White’under saline(150 mM NaCl)and non-saline in vitro condition.Nodal cutting with an axillary buds were used as explants.Application of 1 mM ascorbic acid with or without 0.05 mM gibberellic acid into the MS medium stimulated the length of shoots and the number of new shoots of‘Prism Rose’;whereas,it decreased the root length and the number of roots of both‘Prism Rose’and‘Prism White’under non-saline condition.The addition of ascorbic acid with or without gibberellic acid into the MS medium under saline condition,increased the length of plants and the number of new shoots,but did not affect their root number and length.NaCl treatments increased the proline content and lipid peroxidation which was indicated by the accumulation of malondialdehyde(MDA).The study revealed a correlation between chlorophylls a and b content and the leaf pigmentation intensity–parameter a*.Addition of 1 mM ascorbic acid with 0.05 mM gibberellic acid into the MS medium plays a protective role in salinity tolerance by improving the shoot growth and the development as well as increasing the activities of the antioxidant enzymes and other antioxidant substances.

关键词： AsA GA3 Micropropagation Petunia x atkinsiana D.Don Salinity

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Experimental Study of Particle Collection Efficiency of Cylindrical Inlet Type Cyclone Separator

Experimental Study of Particle Collection Efficiency of Cyli...

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作者： G.b.Sakura Andrew Y.T.Leung Department of Civil and Architectural Engineering City University of Hong Kong

The performance of collection efficiency of cylindrical inlet-type cyclone separator for relatively low solid loading rate conditions is reported.Cyclone separators usually operate under high solid loading conditions, but the demand of air pollution control at outdoor densely polluting activities as construction sites and application of power generators, it is advantageous to use cyclone separators to control outdoor air pollution by cyclone separators.Grade efficiencies and overall collection efficiencies have been investigated from 0.008g/m to 0.2g/m solid loading rates at 5m/s and 10m/s inlet velocity conditions.Experimental data were compared with two theoretical predictions based on empirical and mechanistic relationships, developed by smolik and Muschelknautz.To achieve a better understanding of particle separation efficiency, particle cut size diameter for selected loading rate were considered with theoretical approached by Muschelknautz model.both experimental and theoretical results showed that with the increase of solid loading rate and inlet velocity, the particle collection efficiency of cyclone separator increases.

关键词： Cut size diameter cyclone separator grade efficiency solid loading rate swirling flow overall collection efficiency

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