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Yan Cheng, Qian Wang, Qingyu Ban, Jianfeng Geng, Xiao Wei Zhang, Ying Yi, and Xilin Hou

., 2007 ), and leaf mineral accumulation ( Wu et al., 2008 ), but no information has been reported for nonheading Chinese cabbage. Plant height is one of the important agronomic traits for plant breeding in nonheading Chinese cabbage and is affected by

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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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Marc-André Sparke, Achim Wegscheider, Patrick Winterhagen, Ute Ruttensperger, Martin Hegele, and Jens Norbert Wünsche

temperature conditions ( Garner and Björkman, 1996 ). Nevertheless, during ornamental plant production, the application of plant growth regulators (PGRs) is still the most commonly used tool for achieving an effective reduction in plant height ( Latimer, 1992

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Cecil T. Pounders, Eugene K. Blythe, Donna C. Fare, Gary W. Knox, and Jeff L. Sibley

these evaluations were based on data from one site over multiple years. Size categories based on plant height at maturity were first proposed by Egolf and Andrick (1978) . Johnson and Dix (1993) pointed out that “at maturity” is a vague term that

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Kai Zhao, Feng Zhang, Yi Yang, Yue Ma, Yuexue Liu, He Li, Hongyan Dai, and Zhihong Zhang

. Discussion GA is a phytohormone involved in many aspects of plant development. The most obvious function of GA is the promotion of vegetative growth, particularly of plant height ( Hannon, 2002 ; Hedden and Phillips, 2000 ). GA biosynthetic pathway has been

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Teresa A. Cerny, Nihal C. Rajapakse, and Ryu Oi

A research collaboration between Clemson Univ. and Mitsui Chemicals, Japan, has been established to develop and test photoselective greenhouse covers that can filter out far-red (FR) light and control plant height with minimal use of chemicals. The effects of polymethyl methacylate (PMMA) filters containing FR-intercepting dyes were evaluated on watermelon, pepper, chrysanthemum, and tomato to select an optimum dye concentration. As the dye concentration increased, FR interception increased, photosynthetic photon flux (PPF) decreased, and phytochrome photoequilibrium increased from 0.72 to 0.82. Light transmitted through photoselective filters reduced plant height effectively in all species tested. However, watermelon was the most responsive (50% height reduction) and chrysanthemum was the least responsive (20% height reduction) to filtered light. Tomato and peppers had an intermediate response. In watermelons, total shoot dry weight was reduced over 25% compared to the control plants, with a progressive decrease in shoot weight as the dye concentration increased. The specific stem dry weight was gradually reduced as the dye concentration increased. Specific leaf dry weight was slightly reduced under filters, suggesting that smaller plants as opposed to a reduction in dry matter production primarily caused total dry weight reduction. Light transmitted through filters reduced percentage dry matter accumulation into stems from 27% to 18% and increased dry matter accumulation into leaves from 73% to 82%. Photoselective filters are effective in controlling height similarly to chemical growth regulators. Considering the PAR reduction by increase in dye concentration, a dye concentration that gives a light reduction of 25% or 35% may be optimum for commercial development of photoselective films.

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Lucia E. Villavicencio, James A. Bethke, and Lea Corkidi

experiments were conducted at the Center for Applied Horticultural Research (CfAHR) in Vista, CA from 25 Mar. 2010 to 31 July 2010. First experiment Effect of uniconazole on plant height and fruit yield of ‘Early Girl’ tomato, ‘Jalapeno’ pepper and

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Taifeng Zhang, Jiajun Liu, Sikandar Amanullah, Zhuo Ding, Haonan Cui, Feishi Luan, and Peng Gao

, Z. 2013 ZmGA3ox2, a candidate gene for a major QTL, qPH3.1, for plant height in maize Plant J. 73 405 416 doi: 10.1111/tpj.12038 Thiel, T. Kota, R. Grosse, I. Stein, N. Graner, A. 2004 SNP2CAPS: A SNP and INDEL analysis tool for

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Theo J. Blom, M.J. Tsujita, and Glen L. Roberts

Potted plants of Lilium longiflorum Thunb. cvs. `Ace' and `Nellie White' were grown either under an ambient photoperiod (APP) or under an 8-hour photoperiod (8PP) in a greenhouse. The latter photoperiod was achieved by pulling black cloth over the plants at 1615HR and removing the cloth at 0615HR each day, from emergence to flowering. Within each photoperiod, ambient light intensity was reduced by 0, 20, 40 or 60% using various shade cloths permanently suspended above the plants. Heating was set at 20/16C for the dark/light period, respectively. Plant height, determined from the rim of pot to the top of plant, was 25% lower under 8PP compared to APP for both cultivars. Plant height of `Ace' and `Nellie White' increased by 1.5 mm and 2.5 mm, respectively, per 1% light reduction.

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Nihal C. Rajapakse, Roy E. Young, Margaret J. McMahon, and Ryu Oi

The interest in using nonchemical alternatives for growth control of horticultural crops has recently increased due to public concerns for food safety and environmental pollution. Several research teams around the world are investigating alternative growth control measures, such as genetic manipulation, temperature, water and nutrient management, mechanical conditioning, and light quality manipulation. This review discusses the recent developments in light quality manipulation as a nonchemical alternative for greenhouse plant height control.