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Meryem Ipek, Ahmet Ipek, Douglas Senalik, and Philipp W. Simon

such as rate of crop maturity, bulb size and color, clove size and number, leaf number and color, and bolting habit. Variation observed in genetic diversity studies using molecular markers is as wide as that observed for phenotypic variation among the

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Jessica Chitwood, Ainong Shi, Beiquan Mou, Michael Evans, John Clark, Dennis Motes, Pengyin Chen, and David Hensley

. ) ( Nemli et al., 2014 ), and heat tolerance in cowpea ( Lucas et al., 2013 ). Some of the major agronomic traits of interest in spinach are bolting, plant height, and leaf erectness. Bolting is an important trait to consider in relation to developing

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Bo Meyering, Adam Hoeffner, and Ute Albrecht

propensity to “bolt” or initiate rapid stem elongation from the rosette and flower under certain environmental conditions, causing the leaves to assume an unpleasant flavor ( Bashtanova and Flowers, 2011 ). This averse flavor, which is most likely due to

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Ren-Huang Wang, Yu-Mei Hsu, Duane P. Bartholomew, Subbiyan Maruthasalam, and Chin-Ho Lin

regarding the number of treatments and frequency of AVG application are given in Table 1 . Plants treated with 5 ml of an aqueous solution containing 0.02% Break-Thru alone were kept as a control. Inflorescences emerged in the leaf whorl, defined as bolting

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Sylvie Jenni, Isabelle Gamache, John Christopher Côté, and Katrine A. Stewart

Growers of early stalk celery (Apium graveolens var. dulce) often experience financial losses due to bolting (the premature and rapid elongation of the main celery stem) in temperate regions. A method was developed to provide early warning of bolting in field-grown celery, on the basis of two criteria, one visual and one microscopic, for inflorescence development. Bolting could be detected 40 days after transplanting using the visual criterion, and as early as 30 days after transplanting using the microscopic criterion. Early detection of bolting using the visual and microscopic criteria provided celery growers with periods of, respectively, 25 days and up to 35 days to consider harvesting earlier, before the length of the celery stems exceeded commercial standards. This method could be effective in minimizing financial losses due to bolting when coupled with agro-economic studies.

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Brian A. Kahn and Dennis F. Magnello

Abstract

Bolting (premature production of flowers or seeds) of leaf lettuce (Lactuca sativa L.) results in elongated seedstalks and bitter leaves (1). Seed companies often refer to differences in bolting in their advertisements for leaf lettuce cultivars. However, scientific studies that substantiate or refute these claims are not readily available.

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Abbas Lafta, Germán Sandoya, and Beiquan Mou

physiological disorders like rib discoloration, tipburn, premature bolting, and ribbiness ( Jenni, 2005 ; Jenni and Hayes, 2010 ; Jenni and Yan, 2009 ; Ryder, 1999 ). Rib discoloration is present in leaves as lettuce being exposed to warm conditions. This

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Lynn Brandenberger, Todd Cavins, Mark Payton, Lynda Wells, and Tina Johnson

bolting resistance. Yield has been included in a majority of studies and is considered to be a key component of cultivar selection ( Dainello et al., 1987 ; Djurovka et al., 1988 ). The presence of dark green color in spinach is an important aspect of

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Smiljana Goreta and Daniel I. Leskovar

Areas with mild climate conditions are suitable for growing winter spinach (Spinacia oleracea L.). Successful production depends on choosing slow-bolting cultivars resistant to major diseases in each area. Field experiments with a total of 18 cultivars were conducted during 8 years in the Winter Garden region of Texas, an area known for its high white rust (Albugo occidentalis G.W. Wils) inoculum. Spinach cultivars differed widely in their resistance to both white rust and bolting, and the incidence of both traits was more severe as the season progressed. White rust infection increased linearly with average monthly minimal air temperature. Cultivars Fidalgo, Springfield, and Springer were slow bolting and are suitable for areas with no white rust incidence, while cvs. ASR-318, DMC 66-09, Fall Green, Samish, and San Juan were more white rust resistant.

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Douglas C. Sanders and Jennifer D. Cure

The efficacy of undercutting as a technique to control bolting of two short-day onion cultivars was studied in controlled-environment chambers. `Buffalo' and `Granex 33' onions were grown to the third, fifth, and seventh visible leaf stages in a 10-hour photoperiod at 22/18 °C (day/night) and then exposed to 30, 40, 50, 60, or 70 days of vernalizing temperatures (10/10 °C). Half of the plants were undercut at the initiation of the vernalizing treatment. After vernalizing treatments, plants were returned to 14-hour photoperiods at 22/18 °C. `Buffalo', which is resistant to bolting, did not flower significantly under any of these conditions. The flowering response of `Granex 33' increased with leaf number at vernalization and as the duration of vernalization increased. Undercutting `Granex 33' increased the days of vernalization required for flowering and reduced the proportion of flowering relative to controls. Overall dry-matter accumulation was unaffected by leaf number at vernalization or the duration of vernalization but was reduced ≈30% by undercutting. In both cultivars, fresh mass per bulb decreased with increasing leaf stage of vernalization and number of vernalizing days. Undercutting also decreased fresh mass per bulb, but through its effect on bolting, undercutting increased marketable yield for plants vernalized and undercut at the fifth and seventh leaf stages.