Abscission Sites in Nodal Explants of Impatiens sultani

Wilson, J. Warren; Wilson, P. M. Warren; Walker, Emily

doi:10.1093/oxfordjournals.aob.a087502

Cited by 12 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, it was reported that the differentiation of abscission zones in abnormal positions on stems, petioles or branches can occur in vivo in response to tissue injury or infection. When stem, petiole or pedicels are excised from the whole plant, certain parts of them will also form secondary abscission zones in vitro (Addicott 1982, Pierik 1977, 1980, Warren Wilson et al 1986, Warren Wilson et al 1987. The important regulators to induce abscission zone were shown to be auxin and ethylene (Osborne •989).…”

Section: Resultsmentioning

confidence: 99%

Methyl jasmonate induces the formation of secondary abscission zone in stem of Bryophyllum calycinum Salisb

2000

View full text Add to dashboard Cite

Methyl jasmonate (JA-Mc) at a concentration of 0.5 % induced the formation of secondary abscission zone and senescence in several types of stem explants (only internode segment, internode segment with nodes and without leaves, internode segment with nodes and debladed petioles) of Bryophyllum calyciman when it was applied in various places of the stem or the debladed petiole as lanolin paste. In the presence of small leaves in stem explants methyl jasmonate also induced the formation of secondary abscission zone and senescence but the presence of larger leaves completely inhibited methyl jasmonate-induced processes. Auxin, (indole-3-acetic acid, IAA), at a concentration of 0.1% extremely prevented the formarion of secondary abscission zones and senescence in the stem tissues induced by methyl jasmonate. Similar relationship between auxin and methyl jasmonate to induce the formation of secondary abscission zone and senescence was found in decapitated shoot of the intact plant. Mechanisms of the formation of secondary abscission zone are also discussed in terms of the interaction of methyl jasmonate with auxin.

show abstract

Section: Resultsmentioning

confidence: 99%

Methyl jasmonate induces the formation of secondary abscission zone in stem of Bryophyllum calycinum Salisb

2000

View full text Add to dashboard Cite

show abstract

“…The induction of secondary abscission is possible especially in in vitro systems of various plants. [4,[20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Formation of the Secondary Abscission Zone Induced by the Interaction of Methyl Jasmonate and Auxin in Bryophyllum calycinum: Relevance to Auxin Status and Histology

Marasek-Ciołakowska

Dziurka

Kowalska

et al. 2020

IJMS

View full text Add to dashboard Cite

The interaction of methyl jasmonate (JA-Me) and indole-3-acetic acid (IAA) to induce the formation of the secondary abscission zone in the middle of internode segments of Bryophyllum calycinum was investigated in relation to auxin status and histology. When IAA at 0.1% (w/w, in lanolin) was applied to the segments, the formation of the secondary abscission zone at a few mm above the treatment in the apical direction was observed. On the contrary, IAA at 0.5% (w/w, in lanolin) did not induce the formation of the secondary abscission zone. JA-Me at 0.5% (w/w, in lanolin) applied to the middle of internode segments kept in the normal (natural) or inverted positions also induced the formation of the secondary abscission zone below and above parts of the treatment. IAA at 0.5% applied to the cut surface of the upper part of the segments completely prevented the formation of the secondary abscission zone induced by JA-Me. Simultaneous application of IAA 0.5% with JA-Me 0.5% in the middle part of the internode segments induced the formation of the secondary abscission zone at 10 mm to 12 mm above the treatment. Histological analyses indicated that the formation of the secondary abscission zone was characterized by the presence of newly synthesized cell plates that resulted from periclinal cell division within one layer of mother cells in stems. The effects of IAA (0.1%) and JA-Me (0.5%) on the formation of the secondary abscission zone were histologically similar. Comprehensive analyses of plant hormones revealed that the balance of the endogenous levels of IAA in both sides adjacent to the abscission zone was significantly disturbed when the secondary abscission formation was induced by the application of IAA. These results strongly suggest that an auxin gradient is important in the formation of the secondary abscission zone in the internode segments of B. calycinum, and IAA gradient results from polar IAA transport from the application site. IAA is important in the regulation of formation of the secondary abscission zone induced by JA-Me. Further possible mechanisms of the formation of the secondary abscission zone in the internode segments of B. calycinum are also discussed in the interaction of JA-Me and IAA.

show abstract

“…The shoot-tip abscission in the upper, long sboots appears to be closely associated with stem ageing and morphology (treatment A-5 in Tab, 3; cf, also Warren Wilson et al, 1986Wilson et al, , 1987b, and tbere is a close correlation between abscission and the sympodial growth habit of tbe long shoots, of course (T, Suzuki, unpublished observation). Furthermore, in mulberry, in contrast to frequent shoot-tip abscission, tbere occurs no wboiebranch abscission like cladotosis, accompanying the fortnation of abscission zones (T, Suzuki, unpublished observation; see also Kramer andKozlowski 1979 andAddicott 1982),…”

Section: Discussionmentioning

confidence: 98%

“…In the short laterals, photoperiod is not an important determinant of shoot-tip abscission (Fig, 1), resulting primarily from the dominance of the upper, long sboots and intense competition among laterals along the stem (Suzuki andKobno 1987, Suzuki 1990a;cf, also Leakey and Longman 1986), The imposition of dominance and abscission are both delayed by enhancement of shoot growth in 1-year-oid saplings (rooted cuttings) potted in a light clay soii and supplied witb spring nitrogen fertilizer (Suzuki and Kitano 1990), suggesting that nitrogen availability may be important in shoot growth and shoot-tip abscission in mulberry (cf, also Millington 1963), Abscission is highly likely to be associated with stem ageing (senescence) because excision of the node of tbe last vigorous leaf during and after shoot-tip abortion and abscission had only a little effect on the adventitious abscission of the distal intemode (Tab, 1; cf, also Warren Wilson et al, 1986Wilson et al, , 1987b, After apex abscission of the short shoots, the termitial btids are predormant (summer) to dormant (autumn) unless tbe upper, long shoots are removed (Suzuki andKobno 1987, Stizuki 1990b), After release of bud dormancy in the following spring, they can grow out again. However, the growth of most short sboots is very limited; they often bear flower buds with no developing leaf, or only one or more leaves and therefore lose branch vigour a year or more after the first year of growth, they then die and are shed by natural pruning (as defined by Kramer and Koziowsiii 1979), Decapitation-induced, adventitious abscission of the distal internode of the upper, long sboots (Tabs 2 and 3, Fig.…”

Section: Discussionmentioning

confidence: 99%

Shoot-tip abscission and adventitious abscission of internodes in mulberry (Morus alba)

Suzuki¹

1991

Physiol Plant

View full text Add to dashboard Cite

Suzuki, T, 1991, Shoot-tip abscission and adventitious abscission of intemodes in mulberry {Morus alba). -Physiol. Plant. 82: 483^89.In mtilberry {Morus alba L. cv. Shin-ichinose), shoot-tip abscission following the cessation of apical growth could be induced in different intemodes, depending on the vigour of the shoot and its apex and other internal and external factors. In the lateral, short shoots of 1-year-oId stems of low-pruned trees, the apical growth cessation anci shoot-tip abscission (May-June) resulted primarily from the dominance of the upper, long shoots and intense competition among laterals along the stem. Decapitation of the laterals, before abortion of their apices took place (early May), readily caused adventitious abscission of the distal intemode. Similar decapitation-induced, adventitious abscission of the distal intemode of the upper, long shoots of 1-year-old stems of pruned trees also occurred (May-September), demonstrating that the abscission itself is not directly associated with photoperiod. In May and June, decapitation induced abscission primarily in parallel with or after sprouting of lateral buds and shoot elongation, while in July, August and September, the abscission was induced by decapitation and independently of sprouting. Shoot (stem) orientation positively affected the abscission, which is related to gravimorphic effects on buds and shoots on the lower and lateral sides of the horizontally trained stem. These results suggest that the vigour of shoots and apices is an important determinant of growth and apex abscission in mulberry.

show abstract

Abscission Sites in Nodal Explants of Impatiens sultani

Cited by 12 publications

References 0 publications

Methyl jasmonate induces the formation of secondary abscission zone in stem of Bryophyllum calycinum Salisb

Methyl jasmonate induces the formation of secondary abscission zone in stem of Bryophyllum calycinum Salisb

Formation of the Secondary Abscission Zone Induced by the Interaction of Methyl Jasmonate and Auxin in Bryophyllum calycinum: Relevance to Auxin Status and Histology

Shoot-tip abscission and adventitious abscission of internodes in mulberry (Morus alba)

Contact Info

Product

Resources

About