Differential performance of marubakaido apple rootstock shoots grown in culture media containing different agar brands: dynamic rheological analysis

Differential performance of marubakaido apple rootstock shoots grown in culture media containing different agar brands: dynamic rheological analysis

Shoots of the marubakaido apple rootstock grown in culture medium containing BBL agar presented significantly lower multiplication rate (MR) compared to MRs found for shoots grown in medium containing A-7002, A-7921, Select, and Phytagar as gelling agents. In addition, significant hyperhydricity was...

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Bibliographic Details
Published in:In vitro cellular & developmental biology. Plant Vol. 43; no. 4; pp. 356 - 363
Main Authors: Pereira-Netto, Adaucto B., Petkowicz, Carmem L. O., Cruz-Silva, Claudia T. A., Gazzoni, Mariana T., Mello, Arianne F. P., Silveira, Joana L. M.
Format: Journal Article
Language:English
Published: Heidelberg The Society for In Vitro Biology 01-08-2007
Springer
Springer Nature B.V
Subjects:
Agar
Agar brand
apples
Chemicals
Correlation analysis
Culture media
gel strength
Gel-forming polysaccharide
Gelling agent
gelling agents
Gels
hyperhydricity
Liquids
Malus
MICROPROPAGATION
Moduli of elasticity
Molecular weight
Plant cells
Plant reproduction
Plants
Polymers
Polysaccharides
Rheology
Rootstocks
Shoot elongation
shoots
Tissues
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Summary:Shoots of the marubakaido apple rootstock grown in culture medium containing BBL agar presented significantly lower multiplication rate (MR) compared to MRs found for shoots grown in medium containing A-7002, A-7921, Select, and Phytagar as gelling agents. In addition, significant hyperhydricity was found for shoots grown in Phytagar and A-7921 agar-containing media. Analysis of elastic (G′) and viscous (G ) modulus showed that for all of the five agar brands used in this study, G′ was always much higher, i.e., typically one order of magnitude higher than G, which characterizes a strong gel. G′ changed randomly with time for all of the agar brands studied, except for BBL, which presented progressive decline in G′ throughout the culture cycle. Examination of G′, within the same week, showed that Select agar always had the smallest G′, while Phytagar always had the highest G′. Analysis of the loss tangent (tan δ =G/G′), a better indicator for gel behavior compared to G′ isolated, showed that tan δ for Select and Phytagar were always between tan δ values found for A-7002 and BBL. In addition, analysis of tan δ also indicated that BBL and Select agars showed a significantly weaker gel network, compared to Phytagar, A-7002 and A-7921 agars after the third week of culture. When seen together, these results indicate that shoot performance for the marubakaido rootstock is not related to agar gel strength. In addition, the high hyperhydricity rate found for shoots grown on agars A-7921 and Phytagar could not be related to agar gel strength, as well. Analysis of HPSEC profiles indicated that the best performance, i.e., multiplication rate, of marubakaido shoots in agars A-7002 and A-7921 is likely to be related to their lower polydispersity and/or smaller amount of high molecular weight fractions, compared to BBL, Phytagar, and Select agars.
Bibliography:http://dx.doi.org/10.1007/s11627-007-9063-4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1054-5476
1475-2689
DOI:10.1007/s11627-007-9063-4