few years, seeds are appearing in cultivars that were previously seedless ( Chao et al., 2005 ; Vardi et al., 2008 ). The presence of seeds in seedless cultivars is related to the introduction of new genotypes that are sexually intercompatible
United States. The direct cost of renovating or replacing turf damaged by larval root pruning and defoliation of ornamental plants by adults has been estimated to exceed $450 million each year ( Potter and Held, 2002 ). Adult Japanese beetles attack
supported local consumer demand. Plantains, a type of cooking banana, are especially important to Puerto Rican farming, culture, and daily diets. In the last Census on Agriculture for Puerto Rico , plantains ranked second in area planted (≈8930 ha) after
( C. lanatus var. lanatus ) and U.S. Plant Introductions (PIs) of C. lanatus var. lanatus and C. lanatus var. citroides . To substantiate the possibility that the high-frequency oligonucleotides–targeting active genes (HFO-TAG) primers are
Abstract
Ozone (O3) is the most damaging air pollutant affecting agricultural crops in the United States and bean is one of the most O3-sensitive crop species. More than 2000 plant introductions of Phaseolus vulgaris L. were evaluated for sensitivity to O3 by exposing bean plants to 0.6 ppm O3 for 2 hours under controlled environmental conditions; 54 insensitive and 67 highly sensitive plant introductions were identified based on foliar injury symptoms.
Abstract
Salt tolerance differences among 115 plant introductions of lettuce (Lactuca sativa L.) were screened in sand cultures under greenhouse conditions. Leaf and root fresh weights of plants grown for 4 to 5 weeks in salinized sand cultures were compared to a benchmark cultivar, ‘Buttercrunch’. Plant introductions showed a wider range of salt tolerance than standard cultivars of the United States and therefore have some potential in breeding programs designed to increase the salt tolerance of this crop.
Abstract
Two hundred and five USDA Plant Introduction accessions, 19 cultivars, and 5 advanced white-rust resistant lines of spinach (Spinacia oleracea L.) were evaluated for resistance to Fusarium oxysporum Schlecht. f. sp. spinaciae (Sherb.) Synd. & Hans.), the fusarium-wilt pathogen. After inoculation with heavy doses, ca. 200,000 spores/ml, six plant introduction (PI) accessions rated 5 and eleven accessions rated 6 on a 10-point disease-intensity scale (1 = no infection, 10 = plant dead). No high-level resistance was observed.
decrease (AD), and inhibition index (II) across 14 geographic regions of origin for all 293 accessions [63 wild plant introductions (PIs), 207 cultivated PIs, 15 inbreds, and 8 hybrids]. Heat tolerance according to domestication status and root color. No
genetic stocks consisting of 200 cultivated and 50 wild accessions from the United States Department of Agriculture (USDA) National Plant Germplasm System collection of Plant Introductions (PIs) were evaluated during this study. Carrot accessions were
Abstract
Resistance to watermelon mosaic virus 1 in derivatives of Cucumis melo L., Plant Introduction (PI) 180280, was found to be controlled by a single dominant gene. The gene symbol Wmv-1 is proposed.