The ratio of red light to far red light altersArabidopsisaxillary bud growth and abscisic acid signalling before stem auxin changes

The effects of 2,4-dichlorophenoxyacetic acid (2,4-D), gibberellic acid (GA), and abscisic acid (ABA) on the morphogenesis of gametophytes of Lygodium japonicum growing as longer-than-broad biplanar plates in red light and as broader-than-long biplanar plates in blue light were studied. Addition of 2,4-D or GA to the medium induced a change in the form of gametophytes from biplanar to filamentous in red light. Gametophytes growing in a medium containing 2,4-D in blue light were longer than broad, very much like gametophytes growing in the basal medium in red light. Although ABA generally retarded the growth of gametophytes in both light regimes, its presence in a medium containing 2,4-D nullified the effect of the latter, causing gametophytes to become plate-like in red light and short and stunted in blue light. Changes in the morphology of gametophytes induced by growth hormones were accompanied by corresponding changes in their length:width ratio and cell number.

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Endogenous Abscisic Acid in Relation to Bud Growth in Alternate Bearing `Valencia' Orange

PLANT PHYSIOLOGY ◽

10.1104/pp.58.5.681 ◽

1976 ◽

Vol 58 (5) ◽

pp. 681-682 ◽

Cited By ~ 28

Author(s):

Winston W. Jones ◽

Charles W. Coggins ◽

Tom W. Embleton

Keyword(s):

Abscisic Acid ◽

Alternate Bearing ◽

Endogenous Abscisic Acid ◽

Valencia Orange ◽

Bud Growth

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Dormancy regulation: hormonal interaction in maple (Acer platanoides)

Canadian Journal of Botany ◽

10.1139/b69-162 ◽

1969 ◽

Vol 47 (7) ◽

pp. 1165-1169 ◽

Cited By ~ 8

Author(s):

A. E. DeMaggio ◽

J. A. Freeberg

Keyword(s):

Abscisic Acid ◽

Gibberellic Acid ◽

Acid Treatment ◽

Acer Platanoides ◽

Sterile Culture ◽

Hormonal Interaction ◽

Bud Growth ◽

Short Days ◽

Gibberellic Acid Treatment

Whole buds and excised apices (bud scales removed) from dormant trees of Acer platanoides grow in sterile culture in long days but have different responses to gibberellic acid treatment. Bud growth is stimulated by the hormone in long and short days but apices are unaffected. Abscisic acid inhibits not only gibberellin-stimulated bud growth but also the photoperiodically stimulated growth of apices.

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Correlative Inhibition of Lateral Bud Growth in Pisum sativum L. and Phaseolus vulgaris L.: Studies of the Role of Abscisic Acid

Annals of Botany ◽

10.1093/oxfordjournals.aob.a085406 ◽

1977 ◽

Vol 41 (6) ◽

pp. 1163-1170 ◽

Cited By ~ 14

Author(s):

J. C. WHITE ◽

T. A. MANSFIELD

Keyword(s):

Abscisic Acid ◽

Phaseolus Vulgaris ◽

Pisum Sativum ◽

Phaseolus Vulgaris L ◽

Pisum Sativum L ◽

Correlative Inhibition ◽

Lateral Bud ◽

Bud Growth

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Involvement of aba in flower induction of Pharbitis nil

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.2011.003 ◽

2011 ◽

Vol 80 (1) ◽

pp. 21-26 ◽

Cited By ~ 1

Author(s):

Emilia Wilmowicz ◽

Kamil Frankowski ◽

Paulina Glazińska ◽

Jacek Kęsy ◽

Jan Kopcewicz

Keyword(s):

Abscisic Acid ◽

Red Light ◽

Inhibitory Effect ◽

Flower Induction ◽

Pharbitis Nil ◽

Endogenous Abscisic Acid ◽

Flower Inhibition ◽

Aba Content ◽

Floral Bud

Flowering of plants is controlled by hormones among which both stimulators and inhibitors are present. The role of abscisic acid (ABA) in flower induction of the short day plant Pharbitis nil was shown in our experiments through exogenous applications and endogenous level determination of the hormone in cotyledons of seedlings grown under special light conditions.The application of ABA to cotyledons or shoot apices during the first half of a 24-h long inductive night inhibits flowering. The same compound applied towards the end of or after a 14-h long subinductive night increases the number of flower buds produced by these plants.Exposing P. nil seedlings at the beginning of a 24-h long inductive night to far red light (FR) decreases the level of endogenous abscisic acid in cotyledons and leads to flower inhibition. However, a pulse of red light (R) reversing the inhibitory effect of far red light on the flowering of P. nil increases the ABA content.The results obtained confirm previous observations that ABA may play a dual and an important role in the regulation of floral bud formation in P. nil. The flowering occurs when the level of endogenous abscisic acid is low at the beginning and is high toward the end of the inductive night.

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Internal anatomy of individual tomato seeds: relationship to abscisic acid and germination physiology

Seed Science Research ◽

10.1017/s0960258599000136 ◽

1999 ◽

Vol 9 (2) ◽

pp. 117-128 ◽

Cited By ~ 13

Author(s):

Bruce Downie ◽

Sunitha Gurusinghe ◽

Kent J. Bradford

Keyword(s):

Abscisic Acid ◽

Free Space ◽

Nuclear Dna ◽

Red Light ◽

Internal Anatomy ◽

Wild Type ◽

Tomato Seeds ◽

Dna Contents ◽

Mannanase Activity

AbstractTomato seeds that have been dried, imbibed and redried (primed) develop internal free space between the embryo and endosperm. Seeds of the ABA-deficient sitiens(sitw) tomato mutant can exhibit internal free space at the completion of seed development even without priming. Both primed and sitwseeds germinate more rapidly than untreated wild-type seeds. To determine whether internal anatomy predicts germination physiology, individual sitwand primed wild-type seeds were sorted into three categories based upon the extent of internal free space observed non-destructively using X-radiography. Category 3 (C3, extensive free space present) sitw seeds completed germination more rapidly than all other seed categories and genotypes in water, in abscisic acid (ABA) or under far-red illumination. The force necessary to puncture the endosperm caps (and testa) of C3 sitw seeds was less, and the percentage of nuclei in C3 sitw radicle tips in the G2 stage of the cell cycle was greater than for all other seed categories. Wild-type seeds exhibited free space following long-term priming, but germination was still prevented by far-red light and ABA, and endosperm cap strength and nuclear DNA contents were not altered. Endo-β-mannanase activity of individual endosperm caps was not consistently related to their resistance to puncture. While internal free space is diagnostic for primed tomato seeds and occurs in a fraction of sitw seeds, it is not predictive of many aspects of germination physiology.

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