(average of 112 ng·μL −1 and standard deviation of 125 ng·μL −1 ) from identical amounts of tissue processed by the same experienced technician using the same kit. Genotype may play a role, because some individuals from the P. americana F1 population
bermudagrasses on the Oklahoma State University Baseball Field (OSUBF, Stillwater, OK) sod farm that were genotyped using simple sequence repeat markers. Eight additional clonal varieties [no. 33–40 ( Table 1 )] and the OSUBF no. 1 sample formed the second set of
, differences were reported in clomazone tolerance among genotypes of watermelon and its relatives ( Harrison et al., 2011 ). The most tolerant genotypes were accessions of the African watermelon Citrullus lanatus var. citroides obtained from the U
and Ward, 1974 ). Evaluating the response of multiple zoysiagrass genotypes grown in shade may provide additional information on the ability of these grasses to tolerate reduced light environments. Further identification of shade-tolerant genotypes
., 1998 , 2008 ). Poor seed germination and thermodormancy are major problems associated with lettuce production. Depending on genotype, lettuce seed germination is inhibited at temperatures higher than 28 to 32 °C ( Argyris et al., 2008a ; Gray, 1975
lettuce cultivars and germplasm accessions (56 butterhead, 39 crisphead, 35 romaine, 33 loose leaf, and 15 wild genotypes) were selected from more than 3800 cultivars and germplasm accessions in the lettuce collections at the U.S. Department of Agriculture
The Queensland strawberry breeding program aims to sustainably increase profitability for the producer by selecting superior genotypes. To be effective and efficient, selection must account for several traits simultaneously and focus on: 1) the most
1 To whom reprint requests should be addressed: phone: 315-787-2222; Fax: 315-787-2216; e-mail: pdg8@cornell.edu . I thank Mike Dickson, Molly Jahn, George Kotch, Ron Riley, and Rusty Smith for help in obtaining the genotypes used in this work.
( Gbaye and Holloway, 2011 ) and may even exceed 6.0 Mg·ha −1 ( Ehlers and Hall, 1997 ). The first step for developing genotypes with greater yields is the choice of parents, which need to have genetic divergence between them and alleles favorable for
architecture of African bermudagrass may be why this species does not tolerate extremely low mowing heights (≈3.2 mm or less) as well as the dwarf-type hybrid cultivars. Gerken (1994) showed that seven African bermudagrass genotypes typically had shoots