Polarity of regeneration in excised leaves of Crassula argentea. II. Auxin transport inhibitors and auxin–cytokinin interaction

1983 ◽  
Vol 61 (4) ◽  
pp. 1064-1071 ◽  
Author(s):  
Karol E. Paterson
Keyword(s):  
Acetic Acid ◽  
Auxin Transport ◽  
Plantlet Regeneration ◽  
Exogenous Auxin ◽  
Isopentenyl Adenine ◽  
Regeneration Response ◽  
Transport Inhibitors ◽  
Auxin Transport Inhibitors ◽  
High Concentrations ◽  
Indole 3 Acetic Acid

Two auxin transport inhibitors, triodobenzoic acid and 3,3a-dihydro-2-(p-methoxyphenyl)-8H-pyrazol(5,1-a)isoindol-8-one, inhibited the number of plantlets regenerated from leaves of Crassula argentea. This inhibition can be partially overcome with indole 3-acetic acid. The antiauxin, parachlorophenoxyisobutyric acid, reduced the amount of auxin-induced regeneration for 14 days in culture. High concentrations of isopentenyl adenine inhibited the auxin-induced regeneration response, but not the reduction in polarity of plantlet regeneration caused by exogenous auxin.

scholarly journals Young Fruit and Auxin Transport Inhibitors Affect the Response of Mature `Valencia' Oranges to Abscission Materials via Changing Endogenous Plant Hormones

2003 ◽  
Vol 128 (3) ◽  
pp. 302-308 ◽  
Author(s):  
Rongcai Yuan ◽  
Walter J. Kender ◽  
Jacqueline K. Burns
Keyword(s):  
Auxin Transport ◽  
Abscission Zone ◽  
Mature Fruit ◽  
Young Fruit ◽  
Fruit Abscission ◽  
Endogenous Plant Hormones ◽  
Valencia Orange ◽  
Transport Inhibitors ◽  
Auxin Transport Inhibitors ◽  
Indole 3 Acetic Acid

The effects of removal of young fruit and application of auxin transport inhibitors on endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) concentrations were examined in relation to the response of mature `Valencia' orange [Citrus sinensis (L.) Osb.] fruit to abscission materials. ABA concentrations were increased in the fruit abscission zone and pulp but not in the pedicel, peel, or seed of mature fruit by removal of young fruit during the period of reduced response of mature fruit to abscission materials in early May. However, removal of young fruit slightly decreased IAA concentrations in leaves and the abscission zone and pedicel of mature fruit but had no effect on the IAA concentrations in the peel, pulp, or seed of mature fruit. Young fruit had higher IAA concentrations in the abscission zone and pedicel than mature fruit. Application of 2,3,5-triiodobenzoic acid (TIBA), an IAA transport inhibitor, reduced IAA concentrations in the abscission zone of mature fruit but did not influence the IAA concentrations in the pedicel and peel when applied directly to an absorbent collar tied around the pedicel 2 cm above the fruit abscission zone during the less responsive period in early May. ABA concentrations were increased drastically in the fruit abscission zone and pedicel but not in peel by TIBA application. Applications of ABA, or IAA transport inhibitors such as naringenin, quercetin, or TIBA comparably increased the response of mature fruit to the abscission material 5-chloro-3-methyl-4-nitro-1 H-pyrazole (CMN-pyrazole) in early May. These data suggest that young fruit reduce the response of mature `Valencia' oranges to abscission materials through increasing IAA concentrations and decreasing ABA concentrations in the abscission zone of mature `Valencia' orangees.

scholarly journals Differential effects of N-1-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA) on auxin control of swelling of the shoots of Bryophyllum calycinum Salisb.

2017 ◽  
Vol 70 (3) ◽  
Author(s):  
Marian Saniewski ◽  
Justyna Góraj-Koniarska ◽  
Eleonora Gabryszewska ◽  
Kensuke Miyamoto ◽  
Junichi Ueda
Keyword(s):  
Acetic Acid ◽  
Differential Effect ◽  
Auxin Transport ◽  
Differential Mode ◽  
Treatment Area ◽  
Simultaneous Application ◽  
Triiodobenzoic Acid ◽  
Intact Plants ◽  
Naphthylphthalamic Acid ◽  
Indole 3 Acetic Acid

The effects of <em>N</em>-1-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA) on the swelling of the stem in intact and decapitated plants of <em>Bryophyllum calycinum</em> in relation to the interaction with auxin, indole-3-acetic acid (IAA), are described. NPA induced conspicuous local internode swelling only in the area of its application in intact plants and in the decapitated internode in the case of simultaneous application of IAA on the top of the internode. By contrast, TIBA applied to an internode of intact plants induced swelling along the entire internode above the treatment area, and similar results were obtained in the decapitated internode when TIBA was applied in the middle of the internode and IAA was applied onto the top of the internode. The differential effect of NPA and TIBA on stem swelling in <em>B. calycinum</em> is discussed in relation to their differential mode of action on auxin transport.

scholarly journals Novel auxin transport inhibitors phenocopy the auxin influx carrier mutation aux1

2001 ◽  
Vol 25 (4) ◽  
pp. 399-406 ◽  
Author(s):  
Geraint Parry ◽  
Alain Delbarre ◽  
Alan Marchant ◽  
Ranjan Swarup ◽  
Richard Napier ◽  
...  
Keyword(s):  
Auxin Transport ◽  
Transport Inhibitors ◽  
Auxin Transport Inhibitors ◽  
Auxin Influx Carrier
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