Search Results
Abstract
‘Thompson Seedless’ fruits from vines that received gibberellin or auxin treatment were separated into different maturity classes and stored at 0° for 98 days. Samples were withdrawn at about monthly intervals and soluble solids, total acidity, malic acid, arginine and proline were measured. Fruits with differing soluble solids concn had the same soluble solids content per berry. After 30 days of storage, the soluble solids concn and total acidity of non-GA3 treated fruits began to increase, probably as a result of water loss. Malic acid concn and content increased for 30 days in storage, remained stable for the next 28 days, and then decreased during the remainder of the storage period. The amino acids, arginine and proline, remained relatively constant during the 1st 58 days of storage and then increased greatly both in concn and content.
Abstract
Vines of Vitis vinifera ‘Black Corinth’ were sprayed with 100 ppm gibberellin A3 (GA3), 50 ppm 4-chloro-phenoxyacetic acid (4-CPA), or 1000 ppm benzyladenine (BA) about 5 days after anthesis. The concentrations of protein, RNA, and DNA in the berries were measured at 0, 1, 6, 12, 24, 48, and 96 hr after treatment. In the fruits treated with GA3 or 4-CPA, protein, RNA, and DNA were markedly increased compared to untreated fruits during the first 24 hr after treatment; thereafter, concentrations did not significantly differ from those of the control berries. Fruits treated with BA, on the other hand, had significantly higher levels of these substances only at 1 and 6 hr post treatment.
Abstract
14C-ethephon applied to a walnut leaflet penetrated and translocated rapidly in young plants, but more slowly in older plants. The compound translocated to the kernel at higher levels when applied to a leaflet than when applied to the hull but in both cases levels of activity were low. Between 5 and 7 days after application the radioactivity in the kernel decreased markedly, 14C-ethephon in the leaves, hull, shell, and kernel was metabolized, but no side products remained in the plant tissue that could be detected by the techniques employed.
Abstract
The extent of intraspecific variability for N2 fixation among 100 southernpea (cowpea) genotypes was determined, and a screening technique was developed to measure the character. Significant differences in N2 fixation efficiency were found among host plant genotypes following application of a standard commercial mixed strain Rhizobium inoculant. These differences were obtained whether the criterion used was nodule mass, nodule number of nitrogenase activity, as measured by the acetylene reduction assay. This variability is evidence of genetic control of the trait and suggests the possibility of breeding for increased N2 fixation efficiency in cowpea.