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Arthur Villordon, Julio Solis, Don LaBonte, and Christopher Clark

of lignification. It was determined early on that lignification rendered an adventitious root incapable of becoming a storage root and that storage root number was determined within this time period ( Togari, 1950 ; Wilson and Lowe, 1973 ). This

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Desmond G. Mortley, Stephanie Burrell, Conrad K. Bonsi, Walter A. Hill, and Carlton E. Morris

exposed to the longer light period and higher PPF produced significantly greater storage root number, yield, dry mass, percent dry matter, and foliage fresh and dry mass. There was very little or no storage root production among plants of either cultivar

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Arthur Villordon and Christopher Clark

. However, Lawrence et al. (1986) reported that with comparable low levels of M. incognita inoculum under field conditions, ‘Centennial’, a susceptible cultivar, show reduced storage root number and weight relative to ‘Jasper’, a moderately resistant

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Donnie K. Miller, Thomas M. Batts, Josh T. Copes, and David C. Blouin

due to reduction in storage root number (A. Villordon, personal communication). With increasing populations of weeds resistant to glyphosate herbicide, variety development has shifted focus to developing new product formulation technologies with older

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Arthur Villordon, Jeffrey Cole Gregorie, Don LaBonte, Awais Khan, and Michael Selvaraj

‘Beauregard’ SRL relative to the +/+ plants. There was also variation in width and L/W ratio attributes in ‘Beauregard’ ( Fig. 8B and C ). Storage root number was significantly reduced in both cultivars ( Fig. 8D ). The cumulative results are consistent with

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Arthur Villordon, Jeffrey C. Gregorie, and Don LaBonte

storage root number at harvest. Lowe and Wilson (1974) cited limiting factors that influenced final storage root yield, including assimilate production and transport. Green et al. (2005) used the concept of inter-LR competition when describing the