Polyamines as Endogenous Growth Regulators

Galston, Arthur W.; Kaur‐Sawhney, Ravindar

doi:10.1007/978-94-009-3585-3_15

Cited by 110 publications

(57 citation statements)

References 42 publications

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“…They stabilize the protoplasms and influence the cell division while at the same time retard the senescence of the tissues. Their polycationic shape leads to connections with nucleic acids and plasmalemma phospholipids and allow for better permeability of the cell membranes [21].…”

Section: Discussionmentioning

confidence: 99%

In Vitro Micropropagation of Jatropha curcas L. from Bud Aggregates

Mve

Mergeai

Druart

et al. 2013

J. Technol. Innov. Renew. Energy

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Entire plants were regenerated from nodes explants of Jatropha curcas L. following a procedure of bud aggregate induction on MS (Murashige and Skoog) medium supplemented with 25 mg.l -1 citric acid, 12.2 mg.l -1 adenine sulfate, 15 mg.l -1 L-arginine, 2.46 M IBA (indole-3-butyric acid), 30 g.l -1 sucrose and 7 g.l -1 of agar, and enriched with different balances of BA (benzyladenine) and L-glutamine. The histological studies performed on aggregates showed that the buds result from both the development of axillary buds and adventitious budding starting from underlying tissues of the explant. The culture medium containing 6.65 M BA and 25 mg.l -1 L-glutamine gave the best results with an average of 64 buds per aggregate after three weeks for all accessions tested. The buds developed into shoots when placed in an MS medium supplemented with 2.21 M BA, 5.70 M IAA (indole-3-acetic acid) and 15 mg.l -1 L-arginine. These shoots were isolated and then rooted in MS containing 2.46 M of IBA, 2% sucrose and 0.7% agar. The entire process took 13 weeks with a 98% survival rate in terms of plantlets acclimatization. We obtained a multiplication rate of 13 buds per explant and per subculture which is the double of those obtained in other recent works based on the micropropagation of J. curcas from node explants. This protocol is economically more profitable.

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Section: Discussionmentioning

confidence: 99%

In Vitro Micropropagation of Jatropha curcas L. from Bud Aggregates

Mve

Mergeai

Druart

et al. 2013

J. Technol. Innov. Renew. Energy

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“…The polyamines spermidine (Spd) and spermine (Spm) and the diamine putrescine (Put) are basic, small molecules implicated in the promotion of plant growth and development by activating the synthesis of nucleic acids (Marton and Morris 1987; Galston and Kaur‐Sawhney 1995; Tiburcio et al 1997). It has been suggested that they perform many physiological effects by binding to negative charges of phospholipids and DNA, thereby stabilizing the function of the nucleus and the membranes (Kaur‐Sawhney et al 1978).…”

Section: Introductionmentioning

confidence: 99%

Exogenously added polyamines recover browning tissues into normal callus cultures and improve plant regeneration in pine

Tang

Newton

Outhavong

2004

Physiologia Plantarum

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Polyamines are known to influence a variety of growth and developmental processes in higher plants. Tissue browning seriously reduces in vitro plant regeneration in pine species by decreasing the levels of antioxidant enzymes and polyamines in tissue cultures. In the present investigation, the effect of exogenously added polyamines on recovering browning tissues into normal callus cultures and on improving plant regeneration was examined in Virginia pine (Pinus virginiana Mill.). Among the polyamines administered, 1.5 mM putrescine (Put), 1.5 mM spermidine (Spd), or 1.5 mM spermine (Spm) alone resulted in a 19.55%, 18.92%, and 1.45%, respectively, recovering of browning tissues into normal callus cultures in 5 weeks. A combination of Put with Spd or Spm did not result in an increase of recovering rate, compared to the Put or Spd alone. Exogenously added 1.5 mM Put, 1.5 mM Spd, 1.5 mM Put + 1.5 mM Spd, or 1.5 mM Put + 1.5 mM Spm recovers browning tissues into normal callus cultures by increasing the activity of antioxidant enzymes ascorbate peroxidase (APOX), glutathione reductase (GR) and superoxide dismutase (SOD) and by decreasing lipid peroxidation. Exogenously added 1.5 mM Put, 1.5 mM Spd, 1.5 mM Put + 1.5 mM Spd, or 1.5 mM Put + 1.5 mM Spm significantly improve the growth rate of callus cultures, shoot formation, and rooting adventitious shoots. These results demonstrated that exogenously added polyamines recover browning tissues into normal callus cultures by decreasing oxidative damage and improving plant regeneration by acting as plant growth substances.

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“…PAs are able to regulate membrane functions and affect cell differentiation, interact with nucleic acids, etc. ; physiologically, PAs have anti‐senescence activity and ethylene is known as a senescence inducer (Galston and Kaur‐Sawhney 1995). There is no information on the release of PAs in the genus Azospirillum .…”

Section: Introductionmentioning

confidence: 99%

Plant growth regulators and amino acids released by Azospirillum sp. in chemically defined media

Thuler

Floh

Handro

et al. 2003

Lett Appl Microbiol

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Aims: To investigate the ability of Azospirillum sp., a facultative endophitic diazotrophic bacterium, to release plant growth regulators (PGR) such as polyamines, ethylene, indoleacetic acid and amino acids in both combined-N and N-free cultures. Methods and Results: The presence of those substances was analysed by HPLC. Azospirillum sp. is capable of releasing PGR and amino acids into the culture medium. Conclusions: The type and quantity of the released substances varied, depending on the presence of combined-N in the medium. Significance and Impact of the Study: A better knowledge of PGR produced by Azospirillum sp. has been gained.

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Polyamines as Endogenous Growth Regulators

Cited by 110 publications

References 42 publications

In Vitro Micropropagation of Jatropha curcas L. from Bud Aggregates

In Vitro Micropropagation of Jatropha curcas L. from Bud Aggregates

Exogenously added polyamines recover browning tissues into normal callus cultures and improve plant regeneration in pine

Plant growth regulators and amino acids released by Azospirillum sp. in chemically defined media

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