The Ability of Wheat Aleurone Tissue to Participate in Endosperm Mobilization

Black, M.; Chapman, John; Norman, H.D.

doi:10.1007/978-1-4684-1167-6_10

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…We used the availability of two promoters that differed only with respect to whether they contained a GARC or an ABRC to investigate the role of those two hormones in suppressing expression of a-amylase genes during grain development. It is well established that aleurone cells are not normally able to express genes for a-amylase and other hydrolytic enzymes until the grain matures (Black et al, 1983;Cornford et al, 1986). After a certain stage, approximately midway during grain development, expression of these genes can be induced in the presence of GA by first allowing the grain to dry (Black et al, 1983;Cornford et al, 1986).…”

Section: Discussionmentioning

confidence: 99%

Definition and Functional Implications of Gibberellin and Abscisic Acid cis-Acting Hormone Response Complexes

Rogers¹,

Rogers²

1992

The Plant Cell

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The mechanisms by which cis-acting hormone response elements affect transcription is unclear. In this study, we demonstrated that a second "coupling element," identified as O2S, must be present to allow a single copy of either the gibberellin response element (GARE) or the abscisic acid response element (ABRE) to mediate their hormonal effects in the barley Amy32b alpha-amylase gene promoter. The interactive effects of the O2S and the GARE are constrained positionally and spatially; thus, together they form a gibberellin response complex (GARC). The absolute requirement of the O2S for function of the ABRE demonstrates that these together form an abscisic acid response complex (ABRC). A second copy of the GARE can substitute for the O2S in the GARC, but only in one orientation. By expressing the GARC-containing and ABRC-containing promoters in developing aleurone tissue, we showed that hormonal effects prevent alpha-amylase gene expression during the second half of grain development, but other mechanisms suppress expression earlier. Our results suggest that the specific sequence serving as a coupling element in a given gene promoter will greatly affect where and when the GARE or ABRE will be able to regulate transcription.

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Section: Discussionmentioning

confidence: 99%

Definition and Functional Implications of Gibberellin and Abscisic Acid cis-Acting Hormone Response Complexes

Rogers¹,

Rogers²

1992

The Plant Cell

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“…It is well established that aleurone cells are not normally able to express genes for a-amylase and other hydrolytic enzymes until the grain matures (Black et al, 1983;Cornford et al, 1986). After a certain stage, approximately midway during grain development, expression of these genes can be induced in the presence of GA by first allowing the grain to dry (Black et al, 1983;Cornford et al, 1986). Neither the reason for the inability to respond to GA early in development nor the reason why drying can induce this ability later in development is understood.…”

Section: Discussionmentioning

confidence: 99%

Definition and functional implications of gibberellin and abscisic acid cis-acting hormone response complexes.

Rogers

1992

Plant Cell

107

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The mechanisms by which cis-acting hormone response elements affect transcription is unclear. In this study, we demonstrated that a second %oupling element," identified as 02S, must be present to allow a single copy of either the gibberellin response element (GARE) or the abscisic acid response element (ABRE) to mediate their hormonal effects in the barley Amy32b a-amylase gene promoter. The interactive effects of the 0 2 s and the GARE are constrained positionally and spatially; thus, together they form a gibberellin response complex (GARC). The absolute requirement of the 02s for function of the ABRE demonstrates that these together form an abscisic acid response complex (ABRC). A second copy of the GARE can substitute for the 0 2 s in the GARC, but only in one orientation. By expressing the GARC-containing and ABRC-containing promoters in developing aleurone tissue, we showed that hormonal effects prevent a-amylase gene expression during the second half of grain development, but other mechanisms suppress expression earlier. Our results suggest that the specific sequence serving as a coupling element in a given gene promoter will greatly affect where and when the GARE or ABRE will be able to regulate transcription.

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“…The potential role of GAs in seed development remains unclear and could reflect uncontrolled synthesis and metabolism of no physiological significance . The genetic and physiological basis of the apparent insensitivity of developing cereal grains to their endogenous GAs [12,7] requires further elucidation at the membrane/molecular level particularly as considerable progress has been made on the mechanism of GA-induced a-amylase formation during seed germination [22, 51 . Auxins There is still considerable debate on the most suitable quantitative method to measure IAA, its metabolites and the so-called `bound' or `conjugated' forms .…”

Section: Gibberellinsmentioning

confidence: 99%

Are plant growth substances involved in the partitioning of assimilate to developing reproductive sinks?

Lenton

1984

Plant Growth Regul

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The possible involvement of plant growth substances in assimilate production in source leaves, loading into phloem and unloading in sink tissues is discussed in relation to their sites of formation and transport characteristics . The relative importance and possible functions of imported and locally-synthesised plant growth substances in postfertilisation development of reproductive sinks is briefly reviewed .

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The Ability of Wheat Aleurone Tissue to Participate in Endosperm Mobilization

Cited by 5 publications

References 18 publications

Definition and Functional Implications of Gibberellin and Abscisic Acid cis-Acting Hormone Response Complexes

Definition and Functional Implications of Gibberellin and Abscisic Acid cis-Acting Hormone Response Complexes

Definition and functional implications of gibberellin and abscisic acid cis-acting hormone response complexes.

Are plant growth substances involved in the partitioning of assimilate to developing reproductive sinks?

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