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Cyanogenesis In Indiangrass Seedlings, Francis A. Haskins, H. J. Gorz, Kenneth P. Vogel
Cyanogenesis In Indiangrass Seedlings, Francis A. Haskins, H. J. Gorz, Kenneth P. Vogel
Department of Agronomy and Horticulture: Faculty Publications
In a study of seedlings of 72 entries representing 39 species, 14 genera, and 2 tribes of grasses, only entries of the genus Sorghastrum were found to contain the cyanogenic glucoside, dhurrin [(S)-p-hydroxymandelonitrile β-D-glucopyranoside]. Dhurrin was found in seedlings of each of the 10 entries of indiangrass [Sorghastrum mutans (L) Nash] and the three entries of S. pellitum.
Seedlings of five indiangrass cultivars were assayed for dhurrin concentration. Levels expressed as HCN potential (HCN-p) ranged from about 900 ppm for 'Holt' to about 1,200 ppm for 'Llano' and 'Oto'.
Further studies with Oto seedlings indicated that …
Registration Of N-2 Red Clover Germplasm, H. J. Gorz, G. R. Manglitz, Francis A. Haskins
Registration Of N-2 Red Clover Germplasm, H. J. Gorz, G. R. Manglitz, Francis A. Haskins
Department of Agronomy and Horticulture: Faculty Publications
N-2 red clover (Trifolium pratense L.), carrying high levels of resistance to the yellow clover aphid (Therioaphis trifolii (Monell)) and the pea aphid (Acyrthosiphon pisum (Harris)), was released to researchers and commercial breeders in July 1978. It was developed by five cycles of phenotypic recurrent selection for yellow clover aphid (yeA) resistance and three such cycles for pea aphid (PA) resistance. Thirty-five diverse sources of germplasm, used in the initial evaluations for aphid resistance, were listed previously.
Selection For Yellow Clover Aphid And Pea Aphid Resistance In Red Clover, H. J. Gorz, G. R. Manglitz, Francis A. Haskins
Selection For Yellow Clover Aphid And Pea Aphid Resistance In Red Clover, H. J. Gorz, G. R. Manglitz, Francis A. Haskins
Department of Agronomy and Horticulture: Faculty Publications
Most red clover (Trifolium pratense L.) cultivars are susceptible to attack by the yellow clover aphid (Therioaphis trifolii Monell) and the pea aphid (Acyrthosiphon pisum Harris). Starting with 27 yellow clover aphid-resistant plants selected from a wide diversity of germplasm, phenotypic recurrent selection was used to improve resistance to the two aphids. Through five cycles of testing and selection for yellow clover aphid resistance and three such cycles for pea aphid resistance, a synthetic, 'N-2', was developed that had a high level of resistance to both aphids.
Effects Of Glyphosate On Highbush Blueberry (Vaccinium Corymbosum L.), Laurie Hodges, Ronald E. Talbert, J. N. Moore
Effects Of Glyphosate On Highbush Blueberry (Vaccinium Corymbosum L.), Laurie Hodges, Ronald E. Talbert, J. N. Moore
Department of Agronomy and Horticulture: Faculty Publications
Five-year-old 'Collins' highbush blueberries were treated in August with glyphosate (N-phosphonomethyl glycine) at 0.36, 3.6 and 7.2 g/liter acid equivalent as a spot treatment alone or with pruning or applying paraquat (1, 1'-dimethyl-4, 4'-bipyridinium ion) at 1.2 g/liter to remove green tissue prior to glyphosate application. Initial response was terminal dieback of young canes. Symptoms the following spring included additional terminal dieback, leaf and cane morphological aberrations, and elongation of the flower corolla. One year after treatment, regrowth was normal. There was no effect on blueberry yield the season following treatment.
Dhurrin In Sorghastrum Nutans, H. J. Gorz, Francis A. Haskins, Richard Dam, Kenneth P. Vogel
Dhurrin In Sorghastrum Nutans, H. J. Gorz, Francis A. Haskins, Richard Dam, Kenneth P. Vogel
Department of Agronomy and Horticulture: Faculty Publications
The isolation of dhurrin, the cyanogenic glycoside of Sorghum, was reported by Dunstan and Henry in 1902 [1]. This compound, now known to be (S)-p-hydroxymandelonitrile β-D-glucopyranoside [2, 3], was the first cyanogenic glycoside isolated from a representative of the Gramineae [4]. The occurrence of other cyanogenic glycosides in certain grasses is now recognized [4, 5], but according to Fat [4], Sorghum remains the only genus in which the presence of dhurrin has been firmly established. In this report, evidence is presented indicating that dhurrin also occurs in seedlings of the warm season perennial prairie grass, indiangrass, Sorghastrum …
Combining Ability In Forage Sorghum Hybrids, W. M. Ross, Herman J. Gorz, Francis A. Haskins, K. D. Kofoid
Combining Ability In Forage Sorghum Hybrids, W. M. Ross, Herman J. Gorz, Francis A. Haskins, K. D. Kofoid
Department of Agronomy and Horticulture: Faculty Publications
Two cross-classified hybrid forage sorghum [Sorghum bicolor (L.) Moench] experiments were conducted at Mead, NE: Experiment 1 (3 females x 8 males), in 1973-75, and Experiment 2 (13 females x 2 males), in 1974-75. Data were collected on plant height, days to bloom, forage yield, percent dry matter (DM), percent protein, and in vitro dry matter disappearance (IVDMD) in both experiments and percent Brix in Experiment 1. Differences among hybrids averaged over females or over males were significant for each trait in one parental group or the other in each test except IVDMD in Test 1 and DM in …