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Title:Effects of temperature on yield, fruit shape, and flower primordium development of bell pepper (Capsicum annuum L.)
Author(s):Choi, Geunwon
Doctoral Committee Chair(s):Gerber, John M.
Department / Program:Agriculture, General
Biology, Plant Physiology
Discipline:Agriculture, General
Biology, Plant Physiology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, General
Biology, Plant Physiology
Abstract:Two years of field studies were conducted to evaluate effects of spunbonded polypropylene row cover removal time on growth, yields, and fruit shape and size of bell pepper. Vegetative growth of bell pepper increased under row covers, and plant fresh weight was positively correlated with the duration of row cover treatment. Not only fruit yields but also yield of 4-lobed pepper fruits was optimum between 500 and 700 Heat Units accumulated under row covers for 5 or 6 weeks after transplanting. The results suggest that increased air temperature under row covers affects the fruit lobe number. There was an increased percentage of 4-lobed fruit produced under row covers compared with no cover.
Anatomical investigations determined temperature effects on the rate of plant and flower development. Flower primordium differentiation of bell pepper was divided into 10 stages from vegetative to a fully developed flower bud according to ontogenic changes of the shoot apex. The results showed that the rate of flower primordium development was highly correlated with the physiological age as determined by leaf number. It was determined that initiation of carpels through carpel fusion occurred between the sixth and eighth leaf stages. Both physiological age and flower development were significantly hastened by high temperature(30$\sp\circ$C) and the relationship between physiological age and flower development was independent of temperature.
Issue Date:1989
Rights Information:Copyright 1989 Choi, Geunwon
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9010828
OCLC Identifier:(UMI)AAI9010828

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