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Dissertation/Thesis Abstract

Ethylene synthesis and sensitivity in crop plants
by Romagnano, Joseph F., Ph.D., Utah State University, 2008, 192; 3316107
Abstract (Summary)

The gaseous plant hormone ethylene is a small molecule that regulates developmental change. Research was conducted in three areas: sensitivity, synthesis, and alterations to synthesis. Vegetative pea plants were more sensitive than radish plants to atmospheric ethylene. Light intensity did not affect ethylene sensitivity. Ethylene synthesis rates were measured for unstressed cotton, corn, soybean, and tomato plants. The per-plant ethylene synthesis rate ranged from 0.1-80 pmol plant-1 s-1. However, when normalized to net photosynthetic rate, this range was 1-4 ╬╝mol of ethylene synthesis per mol of CO2 uptake. Diurnal cycles in ethylene synthesis were present in all crops studied. These cycles were disrupted by drought stress and were attenuated when synthesis rates underwent large changes. Drought stress decreased synthesis in cotton. Flooded corn and soybean had increased synthesis. Blocked perception had no effect on ethylene synthesis or net photosynthetic rate in healthy unstressed plants.

Indexing (document details)
Advisor: Bugbee, Bruce
Commitee: Bingham, Gail, Carman, John, Kratsch, Heidi, Wheeler, Raymond, Wu, Yajun
School: Utah State University
Department: Agriculture
School Location: United States -- Utah
Source: DAI-B 69/08, Dissertation Abstracts International
Subjects: Agronomy, Plant sciences
Keywords: Advanced life support, Controlled environments, Crop plants, Ethylene, Ethylene sensitivity, Ethylene synthesis
Publication Number: 3316107
ISBN: 978-0-549-68712-2
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