Document Detail

Light interacts with auxin during leaf elongation and leaf angle development in young corn seedlings.
MedLine Citation:
PMID:  12520327     Owner:  NLM     Status:  MEDLINE    
Modern corn ( Zea mays L.) varieties have been selected for their ability to maintain productivity in dense plantings. We have tested the possibility that the physiological consequence of the selection of the modern hybrid, 3394, for increased crop yield includes changes in responsiveness to auxin and light. Etiolated seedlings in the modern line are shorter than in an older hybrid, 307, since they produce shorter coleoptile, mesocotyl, and leaves (blade as well as sheath). Etiolated 3394 seedlings, as well as isolated mesocotyl and sheath segments, were less responsive to auxin and an inhibitor of polar auxin transport, N-1-naphthylphthalamic acid (NPA). Reduced response of 3394 to auxin was associated with less reduction of elongation growth by light (white, red, far-red, blue) than in 307, whereas the activity of polar auxin transport (PAT) and its reduction by red or far-red light was similar in both genotypes. NPA reduced PAT in etiolated 3394 seedlings much less than in 307. A characteristic feature of 3394 plants is more erect leaves. In both hybrids, light (white, red, blue) increases leaf declination from the vertical, whereas NPA reduces leaf declination in 307, but not in 3394. Our results support findings that auxin and PAT are involved in elongation growth of corn seedlings, and we show that light interacts with auxin or PAT in regulation of leaf declination. We hypothesize that, relative to 307, more erect leaves in the modern hybrid may be primarily a consequence of a reduced amount of auxin receptor(s) and reduced responsiveness to light in etiolated 3394 plants. The more erect leaves in 3394 may contribute to the tolerance of the modern corn hybrid to dense planting.
Martin Fellner; Lindsey A Horton; Allison E Cocke; Nicholas R Stephens; E David Ford; Elizabeth Van Volkenburgh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2002-10-01
Journal Detail:
Title:  Planta     Volume:  216     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-01-09     Completed Date:  2003-05-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  366-76     Citation Subset:  IM; S    
University of Washington, Department of Botany 355325, Seattle, WA 98195-5325, USA.
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MeSH Terms
Adaptation, Physiological / drug effects,  radiation effects
Biological Transport / drug effects,  physiology,  radiation effects
Indoleacetic Acids / metabolism,  pharmacology*
Naphthaleneacetic Acids / pharmacology
Phthalimides / pharmacology
Plant Growth Regulators / pharmacology
Plant Leaves / drug effects,  growth & development*,  radiation effects
Zea mays / drug effects,  growth & development*,  radiation effects
Reg. No./Substance:
0/Indoleacetic Acids; 0/Naphthaleneacetic Acids; 0/Phthalimides; 0/Plant Growth Regulators; 132-66-1/alpha-naphthylphthalamic acid; 86-87-3/1-naphthaleneacetic acid

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