Auxin Redistribution during First Positive Phototropism in Corn Coleoptiles
نویسندگان
چکیده
منابع مشابه
Can lateral redistribution of auxin account for phototropism of maize coleoptiles?
Elongation growth of intact, red-light grown maize (Zea mays L.) coleoptiles was studied by applying a small spot of an indole acetic acid (IAA)-lanolin mixture to the coleoptile tip. We report that: (a) endogenous auxin is limiting for growth, (b) an approximately linear relation holds between auxin concentration and growth rate over a range which spans those rates occurring in phototropism, a...
متن کاملPhototropism and photoinhibition of basipolar transport of auxin in oat coleoptiles.
We have proposed that the lateral inequality of auxin associated with the phototropic response is a consequence of a light-induced impairment of basipolar transport of the hormone. If this is so, the dose-response curve for photoinhibition of auxin transport should resemble that for phototropism. Further, the wavelength dependencies of the transport and tropic response should also be similar. O...
متن کاملLateral movement of auxin in phototropism.
Lateral movement of indoleacetic acid-1-(14)C in corn coleoptiles was measured as radioactivity moving laterally following unilateral application of the auxin. The data suggest that there is an endogenous lateral movement of auxin, and that phototropic stimulation of the coleoptile depresses lateral movement towards the light and enhances lateral movement away from the light. The lateral moveme...
متن کاملA common fluence threshold for first positive and second positive phototropism in Arabidopsis thaliana.
The relationship between the amount of light and the amount of response for any photobiological process can be based on the number of incident quanta per unit time (fluence rate-response) or on the number of incident quanta during a given period of irradiation (fluence-response). Fluence-response and fluence rate-response relationships have been measured for second positive phototropism by s...
متن کاملGrowth, Auxin, and Tropisms in Decapitated Avena Coleoptiles.
With all the work on auxin appearing in the last years it is remarkable that not more investigations are concerned with the actual role of the auxins inside the plant. Barring some early opposition, the original statement "Without auxin no growth" (12) has stood unchallenged for many years. Probably this was so because all test methods were based on the principle of proportionality between auxi...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1992
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.99.4.1302