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Patrick J. Conner

been involved in pecan cultivar testing for over 93 years ( Worley and Mullinix, 1994 ). More recently, it has been a testing location for the National Pecan Advanced Clone Testing System (NPACTS). This system tests advanced pecan selections from the

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Michael S. McCoy, Kathleen M. Kelley, and Dan T. Stearns

selection decision ( Ettenson and Turner, 1997 ). In contrast, when choosing services from nonprofessionals, such as dry cleaners and hair stylists, the factor's order of importance differed depending upon which nonprofessional service was sought ( Ettenson

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Sergio Jiménez, Jorge Pinochet, Anunciación Abadía, María Ángeles Moreno, and Yolanda Gogorcena

commercial rootstocks. Traditional selection procedures used to detect tolerance to iron chlorosis are based on field evaluation ( Socias i Company et al., 1995 ). However, this practice requires long evaluation periods, is time consuming, and is very

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Felipe Barrera Sánchez, Larissa Pereira Ribeiro, Mayara Fávero Cotrim, Carlos Antonio da Silva Junior, Leonardo Lopes Bhering, and Paulo Eduardo Teodoro

., 2005 ). The association of production components with the soluble solids content in cherry tomatoes allows the selection of promising genotypes ( Araújo et al., 2016 ; Sánchez et al., 2019 ). Because of the high demand and the search for new hybrids

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Jung Hyun Kwon, Ji Hae Jun, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yoon, Seok Kyu Yun, and Sung Jong Kim

Tomes, 1943 ; Jun et al., 2010 ; Okie and Weinberger, 1996 ). Therefore, evaluating pollen viability among cultivars is an important process in the selection of a suitable pollinizer. In addition, the bloom periods of the pollinizer and main cultivar

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Michael C. Shannon

Abstract

Selections were made within ‘Empire’ lettuce (Lactuca sativa L.) to determine whether observed salt tolerance differences were due to microenvironmental influences in salt distribution or to genotypic variation. In a 3-year study conducted in small field plots, selections from ‘Empire’ were tested under high and low salinity conditions. First cycle, pure-line selections for high plant fresh weight (frame) and high head/frame ratios under high salinity were significantly improved in their respective selected characters over the parental line. Further selection within these lines did not substantially improve their respective phenotypes and led to the conclusion that the selected characters were homozygous within the ‘Empire’ cultivar.

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F. A. Bliss

Abstract

The precision of a 9-plant hill-plot design in which plants were sown 15 cm apart in a 3 × 3 arrangement compared favorably to that of 3-m-row plots containing approximately 75 plants for the estimation of pod yield of snap beans Phaseolus vulgaris L. Quality traits and sieve size distribution based on pod diameter in both plot designs were similar. Using the square design, the entire 9-plant plot can be taken as the unit of selection, or single plant selection can be practiced when the test plant is grown in the center hill surrounded by 8 uniform guard plants. Single plant selection using this design has been used effectively to modify traits of beans having moderate to high heritability. Selection based on family means should be used for traits with low heritability. Efficiency of the hill-plot design is realized in terms of smaller plot size, fewer required seeds per plot and reduced harvest time.

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Colleen Kennedy, Luis F. Osorio, Natalia A. Peres, and Vance M. Whitaker

for genetic gains using recurrent selection methodologies. However, these studies also suggest that heritability estimates are characteristic of individual populations and environments. Furthermore, genetic parameters may change over time as

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Virginia M. Moore and William F. Tracy

achieved by shortening the ear rather than actually lengthening the husk. The goals of this research were to determine the feasibility of selecting a sweet corn population for longer husks without shortening the ears, to determine whether direct selection

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Sandra B. Wilson, Julia Rycyna, Zhanao Deng, and Gary Knox

to determine 1) if the selection displays invasive traits that cause greater ecological impact than the wild-type or resident species and if it can be readily distinguished; and 2) the fecundity of the selection and its chances of regression or