Involvement of Abscisic Acid in Ethylene-Induced Cotyledon Abscission in Cotton Seedlings

Suttle, Jeffrey C.; Hultstrand, Julie F.

doi:10.1104/pp.101.2.641

Cited by 29 publications

(9 citation statements)

References 7 publications

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“…However, the inhibition required high levels of NBD (2000 ,al L -' ) and a threshold concentration of ABA (0 .25 mM) that were only sufficient to achieve 30% abscission in the treated explants . Yet, the same concentration of NBD completely inhibited any abscission in explants treated (Table 4) as reported by Suttle and Hultstrand [24] for cotton cotyledonary node explants . The increased sensitivity to hormoneinduced abscission including ABA and ethylene has been associated with declining auxin concentrations at the abscission zone [10,11,15,16] .…”

Section: Discussionsupporting

confidence: 56%

Abscisic acid- and ethylene-induced defoliation of Radermachera sinica L.

1994

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Radermachera sinica L . is an ornamental plant with demonstrated sensitivity to ethylene-induced leaf abscission . In this study, we examine the relationship between abscisic acid (ABA) and ethylene in initiating the abscission response . Treatment with 1 tl L-1 of ethylene, 1 mM 1-aminocyclopropane-l-carboxylic acid (ACC) or 1 mM ABA resulted in complete defoliation of leaf explants . Application of 0 .125 mM silver thiosulfate (STS) inhibited ethylene-and ACC-induced abscission but had no effect on explants treated with ABA . The ABA-induced abscission was unaffected by treatment with aminoethoxyvinylglycine (AVG) or aminooxyacetic acid (AOA) . Treatment of explants with 1 mM cobalt chloride (CoC12) or 2000 µl L -1 of norbornadiene (NBD) completely inhibited abscission in explants treated with 1 ttl L-1 ethylene or 1 mM ACC but they were only marginally effective in blocking ABAinduced abscission despite the lower level of endogenous ethylene . ABA appeared to increase the sensitivity of explants to ethylene . However, the evidence suggests that ABA may also function independent of ethylene to induce leaf abscission in R. sinica .Abbreviations: ABA = abscisic acid ; ACC = 1-aminocyclopropane-l-carboxylic acid ; AOA = aminooxyacetic acid ; AVG = aminoethoxyvinylglycine ; CoC12 = cobalt chloride; NBD = norbornadiene ; STS = silver thiosulfate . 243

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Section: Discussionsupporting

confidence: 56%

Abscisic acid- and ethylene-induced defoliation of Radermachera sinica L.

1994

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“…In other plant species, a relationship among ABA, ethylene and leaf abscission has been reported (Goren et al 1993;Suttle and Hultstrand 1993;Gómez-Cadenas et al 1996). In citrus plants subjected to severe water stress, high levels of ABA were required to initiate ACC accumulation in roots and to induce its oxidation to ethylene in shoots after re-watering (Gómez-Cadenas et al 1996).…”

Section: Discussionmentioning

confidence: 96%

Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Mahouachi

Arbona

2007

Plant Growth Regul

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Changes on abscisic acid (ABA), jasmonic acid (JA) and indole-3-acetic acid (IAA) levels were investigated in papaya seedlings (Carica papaya L.) cv. ''Baixinho de Santa Amalia'' under progressive water stress and subsequent rehydration. Also, the behaviour of leaf gas exchange and leaf growth was determined under stress condition. The results indicated that ABA and JA differ in their pattern of change under water stress. ABA continuously increased in leaves and roots during the whole period of stress whereas JA showed a sharp increase and a later decrease in both organs. Re-watering reduced rapidly (24 h) leaf and root ABA to control levels whereas the influence on JA levels could not be assessed. Drought and recovery did not alter IAA levels in leaf and root tissues of papaya seedlings. In addition, water stress reduced stomatal conductance, photosynthetic rate, transpiration rate, the percentage of attached leaves and leaf growth. Rehydration reverted in few days the effects of stress on leaf growth and gas exchange parameters. Overall, the data suggest that ABA could be involved in the induction of several progressive responses such as the induction of stomatal closure and leaf abscission to reduce papaya water loss. In addition, the pattern of accumulation of JA is compatible with a triggering signal upstream ABA. The unaltered levels of IAA could suggest a certain adaptive ability of papaya to maintain active physiological processes under progressive drought stress.

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“…Previous results from this laboratory have demonstrated that the sustained synthesis and action of ABA are essential for the establishment and maintenance of microtuber endodormancy (Suttle and Hultstrand, 1994). Both ABA and ethylene interact in the regulation of other physiological processes, including the expression of certain wound-induced genes and the regulation of leaf abscission (Hildmann et al, 1992;Suttle and Hultstrand, 1993;O'Donnell et al, 1996). The nature and extent of the interaction of ABA and ethylene in tuber endodormancy regulation is unknown.…”

Section: Discussionmentioning

confidence: 99%

Involvement of Ethylene in Potato Microtuber Dormancy

Suttle

1998

Plant Physiology

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Potato (Solanum tuberosum L.) single-node explants undergoing in vitro tuberization produced detectable amounts of ethylene throughout tuber development, and the resulting microtubers were completely dormant (endodormant) for at least 12 to 15 weeks. The rate of ethylene production by tuberizing explants was highest during the initial 2 weeks of in vitro culture and declined thereafter. Continuous exposure of developing microtubers to the noncompetitive ethylene antagonist AgNO 3 via the culture medium resulted in a dose-dependent increase in precocious sprouting. The effect of AgNO 3 on the premature loss of microtuber endodormancy was observed after 3 weeks of culture. Similarly, continuous exposure of developing microtubers to the competitive ethylene antagonist 2,5-norbornadiene (NBD) at concentrations of 2 mL/L (gas phase) or greater also resulted in a dose-dependent increase in premature sprouting. Exogenous ethylene reversed this response and inhibited the precocious sprouting of NBD-treated microtubers. NBD treatment was effective only when it was begun within 7 d of the start of in vitro explant culture. These results indicate that endogenous ethylene is essential for the full expression of potato microtuber endodormancy, and that its involvement may be restricted to the initial period of endodormancy development.

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Involvement of Abscisic Acid in Ethylene-Induced Cotyledon Abscission in Cotton Seedlings

Cited by 29 publications

References 7 publications

Abscisic acid- and ethylene-induced defoliation of Radermachera sinica L.

Abscisic acid- and ethylene-induced defoliation of Radermachera sinica L.

Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Involvement of Ethylene in Potato Microtuber Dormancy

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