1976
DOI: 10.1007/bf00385422
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Cell elongation in the grass pulvinus in response to geotropic stimulation and auxin application

Abstract: Horizontally-placed segments of Arena satira L. shoots show a negative geotropic response after a period of 30 rain. This response is based on cell elongation on the lower side of the leaf-sheath base (pulvinus). Triticum aestivum L., Hordeum vulgare L. and Secale cereale L. also show geotropic responses that are similar to those in Avena shoots. The pulvinus is a highly specialized organ with radial symmetry and is made up of epidermal, vascular, parenchymatous and collenchymatous tissues. Statoliths, which a… Show more

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Cited by 54 publications
(45 citation statements)
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“…Two possibilities are: (a) they could act as information carriers, bringing key enzymes to substrates that result in the release of free, active hormones from their inactive conjugates (2, 18-20, 24); (b) these relatively dense bodies could act as 'pressure probes' to alter the physical characteristics of cell components such as microtubules and/or microfilaments. This altered physical state could make possible the lateral transport of hormones, such as IAA or GAs, or allow for intake or outflow of ions, such as K+ and Ca2+ (8,10,11,13,15,16,25,28). While processes (a) and/or (b) occur, a third possible role (c) is that starch in the statoliths may also serve as a source of substrate (D-glucose) that is used in cell growth metabolism, particularly in the the synthesis of new cell wall polysaccharides (4,5,19,20).…”
Section: Starch Statoliths and Cereal Grass Pulvinimentioning
confidence: 99%
“…Two possibilities are: (a) they could act as information carriers, bringing key enzymes to substrates that result in the release of free, active hormones from their inactive conjugates (2, 18-20, 24); (b) these relatively dense bodies could act as 'pressure probes' to alter the physical characteristics of cell components such as microtubules and/or microfilaments. This altered physical state could make possible the lateral transport of hormones, such as IAA or GAs, or allow for intake or outflow of ions, such as K+ and Ca2+ (8,10,11,13,15,16,25,28). While processes (a) and/or (b) occur, a third possible role (c) is that starch in the statoliths may also serve as a source of substrate (D-glucose) that is used in cell growth metabolism, particularly in the the synthesis of new cell wall polysaccharides (4,5,19,20).…”
Section: Starch Statoliths and Cereal Grass Pulvinimentioning
confidence: 99%
“…2 Supported by National Aeronautics and Space Administration (NASA) grants asymmetric manner (28). The growth response involves not only cell expansion but also the synthesis of new wall materials (7,14). Cell division is not involved (14).…”
mentioning
confidence: 99%
“…The subsequent differential growth response apparently does not involve cell division but rather occurs solely through a gradient of cell elongation, with the greatest response found in the collenchyma located in the downward-facing half of the pulvinus (Dayanandan et al, 1976). Unilaterally applied auxin causes differential lengthening of the pulvinus, thereby bending the shoot (Dayanandan et al, 1976;Brock and Kaufman, 1988a). Lateral movement of IAA does not appear to be required for the gravitropic response, however (Bridges and Wilkins, 1973;Brock et al, 1991).…”
Section: Discussionmentioning
confidence: 97%
“…Strong evidence exists that the initial graviperception occurs through the movement of starch statoliths (amyloplasts) located in the statenchyma cells found near each vascular bundle in the pulvinus Song et al, 1988). The subsequent differential growth response apparently does not involve cell division but rather occurs solely through a gradient of cell elongation, with the greatest response found in the collenchyma located in the downward-facing half of the pulvinus (Dayanandan et al, 1976). Unilaterally applied auxin causes differential lengthening of the pulvinus, thereby bending the shoot (Dayanandan et al, 1976;Brock and Kaufman, 1988a).…”
Section: Discussionmentioning
confidence: 99%
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