Crop ScienceVolume 32, Issue 5 cropsci1992.0011183X003200050047x p. 1291-1291 Registration of Cultivars Registration of 'Pima S-7' American Pima Cotton E. L. Turcotte, Corresponding Author E. L. Turcotte n/[email protected] Corresponding author.Search for more papers by this authorR. G. Percy, R. G. PercySearch for more papers by this authorCarl. V. Feaster, Carl. V. Feaster Supima Assoc. of America, 4141 E. Broadway Rd., Phoenix, AZ, 85040 USDA-ARS, Univ. of Arizona Maricopa Agricultural Center, 37860 West Smith-Enke Road, Maricopa, AZ, 85239Search for more papers by this author E. L. Turcotte, Corresponding Author E. L. Turcotte n/[email protected] Corresponding author.Search for more papers by this authorR. G. Percy, R. G. PercySearch for more papers by this authorCarl. V. Feaster, Carl. V. Feaster Supima Assoc. of America, 4141 E. Broadway Rd., Phoenix, AZ, 85040 USDA-ARS, Univ. of Arizona Maricopa Agricultural Center, 37860 West Smith-Enke Road, Maricopa, AZ, 85239Search for more papers by this author First published: 01 September 1992 https://doi.org/10.2135/cropsci1992.0011183X003200050047xCitations: 30AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article.Citing Literature Volume32, Issue5September–October 1992Pages 1291-1291 RelatedInformation

Crop ScienceVolume 26, Issue 1 cropsci1986.0011183X002600010066x p. 206-206 Registration of Germplasms Registration Of Five American Pima Cotton Germplasm Lines E. L. Turcotte, E. L. TurcotteSearch for more papers by this authorCarl V. Feaster, Carl V. FeasterSearch for more papers by this author E. L. Turcotte, E. L. TurcotteSearch for more papers by this authorCarl V. Feaster, Carl V. FeasterSearch for more papers by this author First published: 01 January 1986 https://doi.org/10.2135/cropsci1986.0011183X002600010066xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume26, Issue1January–February 1986Pages 206-206 RelatedInformation

Crop ScienceVolume 24, Issue 2 cropsci1984.0011183X002400020045x p. 382-382 Registration of Crop Cultivars Registration of Pima S-6 Cotton Carl V. Feaster, Carl V. Feaster Research agronomist USDA-ARS, Univ. of Arizona Cotton Res. Ctr., Phoenix, AZ, 85040Search for more papers by this authorE. L. Turcotte, E. L. Turcotte research geneticist USDA-ARS, Univ. of Arizona Cotton Res. Ctr., Phoenix, AZ, 85040Search for more papers by this author Carl V. Feaster, Carl V. Feaster Research agronomist USDA-ARS, Univ. of Arizona Cotton Res. Ctr., Phoenix, AZ, 85040Search for more papers by this authorE. L. Turcotte, E. L. Turcotte research geneticist USDA-ARS, Univ. of Arizona Cotton Res. Ctr., Phoenix, AZ, 85040Search for more papers by this author First published: 01 March 1984 https://doi.org/10.2135/cropsci1984.0011183X002400020045xCitations: 26AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article.Citing Literature Volume24, Issue2March–April 1984Pages 382-382 RelatedInformation

The effectiveness of artificial vs. natural selection for improving lint yield and other traits in American Pima cotton (Gossypium barbadense L.) when grown in predictable environments was evaluated at low and high elevations. A cross was made between ‘Pima S‐3,’ adapted to the less fertile soils at high elevations, and ‘Pima S‐4,’ adapted to low elevations and to the more fertile soils at high elevations. F2 through F8 populations from this cross were grown at one low‐elevation and two high‐elevation locations. These populations were subjected to natural selection by bulking all plants to form the next generation, or to artificial selection by bulking only selected plants to form the next generation. Phenotypic differences for lint yield, plant height, and fruiting height among plants within the succeeding generations were greatest at Phoenix, next greatest at Safford, and least at El Paso. Therefore, selection of genotypicaliy productive plants was most effective at Phoenix, somewhat less effective at Safford, and the least effective at El Paso.Artificial‐ vs. natural‐selection cycles 0 (F2), 3, and 6 from each of the three locations were evaluated at all locations. The populations developed by artificial selection at a given location tended to yield more than naturally selected populations at that location, with the greatest advantage at Phoenix, next greatest at Safford, and no advantage at El Paso. Likewise, among locations, natural selection had the most influence on yield potential at Phoenix. In some years, the artificially selected populations from one location tended to yield well at the other locations, but no population yielded well at all‐three locations in both years. Selection for improvement of traits such as lint yield in the environment where the selected population will be utilized was effective. However, if the Pima improvement program were confined to one location, Phoenix appears to be the best of the three locations. At Phoenix, the magnified expression of productivity, and fruiting‐ and plant‐height differences would permit the selection of genotypes that would be productive at each elevation of the American Pima Belt.

The results of 42 linkage tests involving six American Pima cotton (Gossypium barbadense L.) mutants and 15 mutants of G. hirsutum L. are reported. Forty of the tests gave no significant evidence of linkage and two tests indicated linkage. A dominant Pima male‐sterile mutant (Msp) was found to be linked with one of a pair of duplicate factors for glandless (gl1) with 9.38 ± 0.98% recombination and with naked seed (N1) with 13.95 ± 1.89% recombination. Msp was not allelic with the dominant male‐sterile genes Ms4, and Ms7. The gene symbol, Ms11, is proposed for the character Pima male‐sterility in place of the currently used symbol Msp.

A high pubescent Pima (Gossypium barbadense L.) cultivar that has high yield potential and adequate fiber properties was identified and evaluated. Performance testing and fiber quality evaluation were obtained while developing these cottons. The high pubescent cultivar was found to have greater amounts of trash in the seed cotton samples after normal cleaning than low pubescent commercial cultivars. A ginning study was conducted to determine the effectiveness of two seed cotton cleaning treatments for removal of trash from the high pubescent, experimental cultivar and a low pubescent, commercial cultivar. A moderate seed cotton cleaning system was adequate for cleaning the low pubescent Pima cotton, but an elaborate seed cotton cleaning system was required for obtaining acceptable grades of the high pubescent Pima cotton, —

Large differences in vegetative regrowth among nine cultivars were noted in an American Pima cotton (Gossypium barbadense L.) regional test after severe hail damage on 22 July 1974. These differences were correlated negatively with the lint yield of the same cultivars in a nearby, undamaged, Pima cotton regional test. Correlations of number of new leaves and dry weight of new leaves 5 weeks after hail with lint yield on the undamaged test were −0.84 and −0.91, respectively. Theories on transport and utilization of photosynthate in cotton were used to explain differences in recovery among cultivars.

The tetraploid tissue of American Pima cotton (Gossypium barbadense L.) plants chimeral for tetraploid and haploid tissues was found to be of hybrid origin. We crossed 57‐4, a doubled haploid that is semigametic, as female, with a multiple‐marked stock homozygous for glandless and heterozygous for red plant color. A number of the plants from this cross were chimeral for glanded or glandless tissue, red or green tissue, and tetraploid or haploid tissue. The combinations of tissues in tri‐chimeral plants were such that polyspermy appeared to be involved in the development of their tetraploid tissue. We theorized that a sperm nucleus divided in the egg cell before fertilization. The semigametic tendency of the female parent may be associated with the stimulation of divisions of the sperm nucleus.

Semigamy is a type of fertilization in which a sperm nucleus penetrates the egg cell but does not fuse with the egg nucleus. The egg and sperm nuclei divide independently, resulting in a heterogeneous embryo. Haploids sectored for maternal and paternal tissue were obtained among F 2 progenies of crosses of a semigametic line of Pima cotton ( Gossypium barbadense L .), as female, with recessive multiple‐marked stocks. Truebreeding lines of paternal origin were obtained by colchicine doubling of paternal sectors of certain chimeral haploids. Thus homozygous lines of selected parentage were produced. Semigamy was controlled genetically and transmitted through both the egg and pollen but was functional only if the egg nucleus contained the factor or factors that condition it. The development of a semigametic, marked stock widened the scope of material from which haploids can be produced effectively.

In 1965 and 1966, an evaluation of 30 lines comprising experimental ‘Pima’ cotton (Gossypium barbadense L.) strain P17 showed whitish fiber to be associated with higher yield, longer fiber, coarser fiber, stronger yarn, and possibly stronger and less elastic fiber. Yield was not correlated with percent lint or its components (seed index and lint index), but it was highly significantly positively correlated with fiber length for 1 of 2 years. Percent lint was negatively correlated with fiber length for both years. Since the yield and percent lint relationship was independent, the negative association of percent lint and fiber length was no barrier in obtaining a combination of high yield and high quality. The lint of the higher-yielding, higher-quality lines is whiter than that of present commercial varieties. Color appears to have no bearing on the utility of lint.