Search Results
Abstract
Sixteen genotypes of mung bean (Vigna radiata (L.) Wilczek var. radiata) were subjected to 18 treatment combinations (environments) resulting from 3 levels of N, 3 planting densities, and 2 planting times. Measurements were made on yield and its components: pods per plant, seeds per pod, and seed weight. Cluster analysis was used to provide an index of similarity of the genotypes for each character. Genetic similarity of the genotypes, as indicated by a “one-trait-at-a-time” analysis, is reflected in their phenetic similarity in an 18 dimensional space corresponding to the 18 environments. No relationship between geographic distribution and genetic diversity was obtained for all characters. Information on the diversity of the components of yield would be useful in choosing parents that yield superior progenies. Pods per plant was the most important component followed by seeds per pod, and seed weight. Selection of parents for the component characters, with regard to high performance and genetic diversity, are expected to follow the same order.
Abstract
Plant density had little effect on the number of pistillate flowers on gynoecious inbreds of cucumber (Cucumis sativus L.), but increasing density reduced pistillate flowers in 3 of 4 hybrids. The number of staminate flowers/plant on the gynoecious inbreds was small and was unaffected by density. In 2 of the 4 hybrids of gynoecious x monoecious inbreds, increases in staminate flower production were associated with increasing density.
Abstract
A computer system consisting of several programs and files, developed for management of information generated in all phases of a dry, edible bean (Phaseolus vulgaris L.) breeding program, is described. The interactive system both produces field books and prints labels for field stakes and planting and harvesting bags.
Abstract
A study was conducted to investigate the extent of genetic variations and the interrelationships of several quality traits of cultivars of navy and pinto bean (Phaseolus vulgaris L.) grown at 3 locations in Michigan. The measured traits were seed weight, initial weight of solids, surface color of dry and processed beans (L, aL, bL), weight of soaked beans, hydration ratio, clumps, splits, texture, washed and drained weight, and processed bean moisture. Significant cultivar differences were observed for most of the traits in both classes of beans. Location effects were highly significant for all traits. Certain traits showed significant cultivar × location interactions. Phenotypic correlation coefficients among pairs of characters indicated that, with few exceptions, there were low assocations among quality characters. Principal component analysis confirmed the independence of traits. A selection strategy based on a tandem selection procedure followed by construction of selection indices was suggested.
Abstract
Five cultivars and one breeding line of field bean (Phaseolus vulgaris L.) were evaluated for their differential reactions to beta, gamma, and delta races of anthraenose (Collectotrichum lindemuthianum [Sacc. and Magn.] Scrib.). Parental, F1 and F2 plants from 10 crosses involving anthraenose resistant and susceptible parents were inoculated with the 3 races. Inoculated plants were maintained in a mist chamber for 8 to 10 days until plants could be classified into resistant and susceptible groups on the basis of their reactions to the pathogen. The F2 segregation patterns suggested that independent and complementary gene action at 1 or 2 different loci produced a resistant reaction to all races of the pathogen. In addition, an allelomorphic series of three alleles was assumed to be controlling resistance to the beta race. A breeding scheme, involving alternate generations of back-crossing to the recurrent parent and selfing is an effective method to develop resistant cultivars.