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Effect of abscisic acid on endogenous IAA, auxin protector levels and peroxidase activity during adventitious root initiation in Vigna radiata cuttings

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Abstract

Endogenous levels of free and conjugated IAA, auxin protectors (Prs) and peroxidase (PER) activity and their relation to adventitious root initiation (ARI) were investigated at the potential sites of adventitious rooting in relation to exogenous application of 250 µM ABA during the first 120 h after treatment. Cuttings from 7-day-old mung bean [Vigna radiata (L.) Wilcz.] seedlings were treated with 125, 250, and 500 µM ABA for 24 h. ABA significantly stimulated ARI but extremely inhibited epicotyl growth as compared to control. Free and conjugated IAA were measured by reversed-phase high performance liquid chromatography while Prs and PER activities were measured spectrophotometrically. The present results also indicate that endogenous free IAA levels peaked later in ABA-treated cuttings than that in control, suggesting that ABA extended the length of the induction phase of rooting process in treated cuttings and that might explain the significant delay of the appearance of roots at the treated cuttings. Higher level of IAA conjugates was found in ABA-treated cuttings than that in untreated ones. Pr level also peaked later in ABA-treated cuttings than that in control, indicating that ABA extended the period of Pr activity. An initial temporary decrease of PER activity was found in associating with high levels of free IAA and Prs during most of the primary events, while the opposite occurred during the secondary events of adventitious rooting process in both treated and untreated cuttings. Thus, ABA may stimulate ARI in mung bean Vigna radiata cuttings by regulating the concentration and /or activities of endogenous IAA, Prs, and PER activity in favor of inducing a large number of adventitious roots at their potential sites of adventitious rooting.

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Abbreviations

ABA:

abscisic acid

ARI:

adventitious root initiation

2,4-DCP:

2,4-dichlorophenol

FW:

fresh weight

h:

hour

HRP:

horseradish peroxidase

IAA:

indole-3-acetic acid

IBA:

indole-3-butyric acid

MeOH:

methanol

PER:

peroxidase

Pr(s):

auxin protector(s)

Tris:

tris(hydroxymethyl)aminomethane

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  1. Department of Agricultural Botany, Suez-Canal University, Ismailia, Egypt

    Kamel Ahmed Hussein Tartoura

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Tartoura, K.A.H. Effect of abscisic acid on endogenous IAA, auxin protector levels and peroxidase activity during adventitious root initiation in Vigna radiata cuttings. Acta Physiol Plant 23, 149–156 (2001). https://doi.org/10.1007/s11738-001-0002-4

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  • DOI: https://doi.org/10.1007/s11738-001-0002-4

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