Geotropic Response of Wheat Coleoptiles in Absence of Amyloplast Starch

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Geotropic Response of Wheat Coleoptiles in Absence of Amyloplast Starch

Young coleoptiles of wheat (Triticum durum var. Henry), depleted of amyloplast starch by incubation at 30 degrees C with gibberellin plus kinetin, retained their geotropic responsiveness. Depleted coleoptiles curved upward more slowly than controls, but this was commensurate with their slower growth. The ratio of curvature to growth was about 50 degrees per mm of elongation in both cases. Newly...

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Geotropic Response of Coleoptiles under Anaerobic Conditions ' Malcolm B . Wilkins

It has been reported recently that coleoptiles of Zea mays develop a geotropic response under anaerobic conditions (2). The geotropic response of a coleoptile arises from the differential growth of the upper and lower halves of the organ. At least 3 independent investigations have shown that in Avena sativa coleoptiles growth is totally arrested in the absence of 02 (1,6, 9). It is therefore di...

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Geotropic Response of Coleoptiles under Anaerobic Conditions ' Malcolm B

It has been reported recently that coleoptiles of Zea mays develop a geotropic response under anaerobic conditions (2). The geotropic response of a coleoptile arises from the differential growth of the upper and lower halves of the organ. At least 3 independent investigations have shown that in Avena sativa coleoptiles growth is totally arrested in the absence of 02 (1,6, 9). It is therefore di...

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The Geotropic Response in Asterina

Upon a surface inclined at angle alpha Asterina gibbosa orients upward during negatively geotropic creeping until the average angle (theta) of the path is such that Delta sin theta/Delta sin alpha = const. This is true also in positively geotropic movement. The direction of orientation may be temporarily reversed by mechanical disturbance. The variation of theta is greater at low slopes. Tests ...

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Amyloplast-localized SUBSTANDARD STARCH GRAIN4 protein influences the size of starch grains in rice endosperm.

Starch is a biologically and commercially important polymer of glucose and is synthesized to form starch grains (SGs) inside amyloplasts. Cereal endosperm accumulates starch to levels that are more than 90% of the total weight, and most of the intracellular space is occupied by SGs. The size of SGs differs depending on the plant species and is one of the most important factors for industrial ap...

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ژورنال

عنوان ژورنال: Journal of General Physiology

سال: 1966

ISSN: 1540-7748,0022-1295

DOI: 10.1085/jgp.49.5.1065