کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10694683 | 1020239 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of auxin and ethylene for gravitropic differential growth of coleoptiles and roots of rye- and maize seedlings
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The role of auxin and ethylene for gravitropic differential growth of coleoptiles and roots of rye- and maize seedlings The role of auxin and ethylene for gravitropic differential growth of coleoptiles and roots of rye- and maize seedlings](/preview/png/10694683.png)
چکیده انگلیسی
The relevance of auxin and ethylene for differential gravitropic growth has been analyzed both in shoots and roots of etiolated rye- and maize seedlings. As previously demonstrated for indolyl-3-acetic acid (IAA), incubation of coleoptiles in dichlorophenoxy acetic acid (2,4-D) resulted in a two- to threefold length increase compared to water controls. In spite of this immense effect on elongation growth, gravi-curvature was similar to water controls. In contrast, inhibition of ethylene synthesis prevented differential growth of abraded coleoptiles as well as of roots without a significant inhibiting effect on elongation. Inhibition of ethylene perception in horizontally stimulated maize roots growing on surfaces eliminated the capacity of the roots to adapt growth to the surface and a vertical orientation of the root tip. This effect is accompanied by up- and down-regulation of a number of proteins as detected with the 2D-MALDI-TOF (matrix-assisted laser desorption ionization- time of flight) method. Exogenous ethylene inhibited growth but enhanced gravitropic curvature in roots that were “freely” gravistimulated in a horizontal position, exhibiting a pronounced “waving” behavior. Together the data challenge the regulatory relevance of IAA-redistribution for gravitropic differential growth. They corroborate the crucial regulatory relevance of ethylene for gravitropic growth, in both roots and coleoptiles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 36, Issue 7, 2005, Pages 1167-1174
Journal: Advances in Space Research - Volume 36, Issue 7, 2005, Pages 1167-1174
نویسندگان
H.G. Edelmann, A. Sabovljevic, G. Njio, U. Roth,