ENVIRONMENTAL EFFECTS ON SEED SET IN OILSEED SUNFLOWER (Helianthus annuus L.)

1982 ◽  
Vol 62 (4) ◽  
pp. 867-873 ◽  
Author(s):  
W. W. ROATH ◽  
J. F. MILLER

Incomplete seed set of certain commercial sunflower hybrids may be caused by self-incompatability, partial fertility restoration, or other factors which could be affected by the environment. Three commercial hybrids and their fertile inbred parents were planted at five locations across the central plains area of the U.S. during 1978 and 1979. Relative number and weight of developed seed were determined from six of these environments. Little difference in seed set was observed between bagged and unbagged heads of two of the hybrids and their inbred parents. The bagged heads of the third hybrid and its B-line inbred parent had consistently lower seed set. Environment affected seed set significantly. The number of developed seed in percent was consistently less than the weight of viable seed in percent.

1992 ◽  
Vol 60 (3) ◽  
pp. 195-200 ◽  
Author(s):  
Yoshio Sano ◽  
Mitsugu Eiguchi ◽  
Hiro-Yuki Hirano ◽  
Masa-Aki Yamada

SummaryThe present study was carried out to examine the genetic mechanism responsible for reversions to fertile phenotype detected in cytoplasmic male-sterile plants of rice. The cms-bo cytoplasm of Chinsurah boro II gave rise to male-sterility in plants without a gametophytic restorer gene (Rf1). Taichung 65 (T65A) was known to be the maintainer which carries no restorer; however, Taichun 65 preserved in our laboratory (T65B) showed partial fertility (about 8% seed set) when crossed with the male-sterile plants. Unexpectedly, the seed fertility gradually increased with repeated selfings and almost fully fertile plants were obtained in the F6 generation. The cytoplasmic substitution lines revealed that reversions to fertile phenotype resulted from mutational events at the nuclear level. The genetic experiments indicated that the partial fertility observed in the F1 hybrid was controlled by a dominant gene, Ifr1, which was carried by T65B. The results obtained suggested that Ifr1 itself was associated with instability of fertility restoration in the presence of cms-bo cytoplasm since partially fertile plants carrying Ifr1 always showed a tendency for gradual increase in fertility in the later generations. The results are also discussed in relation to a rapid genetic change through intensified gametic selection combined with instability.


Author(s):  
Elisa Eastwood Pulido

A spiritual biography, this book chronicles the journey of Margarito Bautista (1878–1961) from Mormonism to the Third Convention, a Latter-day Saint (Mormon) splinter group he fomented in 1935–1936, to Colonia Industrial/Nueva Jerusalén, a polygamist utopia Bautista founded in 1947. It argues that Bautista embraced Mormon belief in indigenous exceptionalism in 1901 and rapidly rose through the ranks of Mormon priesthood until convinced that the Mormon hierarchy was not invested in the development of native American peoples, as promoted in the Church’s canon. This realization resulted in tensions over indigenous self-governance within the Church of Jesus Christ of Latter-day Saints (Mormon Church) and Bautista’s 1937 excommunication. The book contextualizes Bautista’s thought with a chapter on the spiritual conquest of Mexico in 1513 and another on the arrival of Mormons in Mexico. In addition to accounts of Bautista’s congregation-building on both sides of the U.S. border, this volume includes an examination of Bautista’s magnum opus, a 564-page tome hybridizing Aztec history and Book of Mormon narratives, and his prophetic plan for the recovery of indigenous authority in the Americas. Bautista’s excommunication catapulted him into his final spiritual career, that of a utopian founder. In the establishment of his colony, Bautista found a religious home, free from Euro-American oversight, where he implemented his prophetic plan for Mexico’s redemption. His plan included obedience to early Mormonism’s most stringent practices, polygamy and communalism. Bautista nonetheless hoped his community would provide a model for Mexicans willing to prepare the world for Christ’s millennial reign.


Author(s):  
James E. Baker

This article discusses covert action within the context of the U.S. law. The first section describes the main elements of the U.S. legal regime, including the definition of covert action and the “traditional activity” exceptions, the elements of a covert action finding, and the thresholds and requirements for congressional notification. The second section describes some of the significant limitations on the conduct of covert action. The third section discusses the nature of executive branch legal practice in this area of the law. And the last section draws conclusions about the role of national security law within the context of covert action.


2021 ◽  
pp. 1-21
Author(s):  
Kevin D. Benish

On May 18, 2020, the United States Supreme Court denied a request by the Bolivarian Republic of Venezuela and its state-owned oil company, Petróleos de Venezuela, S.A. (PDVSA), to review the merits of Crystallex Int'l Corp. v. Bolivarian Republic of Venezuela, a decision by the U.S. Court of Appeals for the Third Circuit. In Crystallex, the Third Circuit affirmed a trial court's determination that PDVSA is the “alter ego” of Venezuela itself, thus permitting Crystallex to enforce a $1.4 billion judgment against Venezuela by attaching property held in PDVSA's name. Given the Supreme Court's decision to leave the Third Circuit's opinion undisturbed, Crystallex is a significant decision that may affect parties involved in transnational litigation for years to come—especially those pursuing or defending against U.S. enforcement proceedings involving the property of foreign states.


2018 ◽  
Vol 81 (5) ◽  
pp. 799-805 ◽  
Author(s):  
LAUREN E. LIPCSEI ◽  
LAURA G. BROWN ◽  
E. RICKAMER HOOVER ◽  
BRENDA V. FAW ◽  
NICOLE HEDEEN ◽  
...  

ABSTRACT The Centers for Disease Control and Prevention (CDC) estimates that 3,000 people die in the United States each year from foodborne illness, and Listeria monocytogenes causes the third highest number of deaths. Risk assessment data indicate that L. monocytogenes contamination of particularly delicatessen meats sliced at retail is a significant contributor to human listeriosis. Mechanical deli slicers are a major source of L. monocytogenes cross-contamination and growth. In an attempt to prevent pathogen cross-contamination and growth, the U.S. Food and Drug Administration (FDA) created guidance to promote good slicer cleaning and inspection practices. The CDC's Environmental Health Specialists Network conducted a study to learn more about retail deli practices concerning these prevention strategies. The present article includes data from this study on the frequency with which retail delis met the FDA recommendation that slicers should be inspected each time they are properly cleaned (defined as disassembling, cleaning, and sanitizing the slicer every 4 h). Data from food worker interviews in 197 randomly selected delis indicate that only 26.9% of workers (n = 53) cleaned and inspected their slicers at this frequency. Chain delis and delis that serve more than 300 customers on their busiest day were more likely to have properly cleaned and inspected slicers. Data also were collected on the frequency with which delis met the FDA Food Code provision that slicers should be undamaged. Data from observations of 685 slicers in 298 delis indicate that only 37.9% of delis (n = 113) had slicers that were undamaged. Chain delis and delis that provide worker training were more likely to have slicers with no damage. To improve slicer practices, food safety programs and the retail food industry may wish to focus on worker training and to focus interventions on independent and smaller delis, given that these delis were less likely to properly inspect their slicers and to have undamaged slicers.


1979 ◽  
Vol 57 (6) ◽  
pp. 860-863 ◽  
Author(s):  
F. S. Razavi ◽  
W. R. Datars

Open orbits in the metal oxide ReO3 were studied by the induced torque method at a temperature of 1.4 K with magnetic fields up to 5.5 T.[Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] open orbits were detected. The results show that the third-band Fermi surface of ReO3 is connected along [Formula: see text] directions as predicted by Mattheiss' augmented-plane-wave band structure calculation. The angular magnetic field range for observation of open orbits and the relative number of primary and secondary open orbits are given.


2020 ◽  
Vol 80 (01) ◽  
Author(s):  
J. Jorben ◽  
S. P. Singh ◽  
C. Tara Satyavathi ◽  
S. Mukesh Sankar ◽  
Jayant S. Bhat ◽  
...  

Present investigation was carried out to study the mode of inheritance of fertility restoration for A4 cytoplasm using pollen fertility and seed set per cent as criterion in determining the fertile and sterile plants. Two CMS lines of A4 cytoplasm were crossed with two fertility restorers generating four F1 crosses, namely, ICMA 99111 x PPMI 1003, ICMA 99111 x PPMI 1087, ICMA 03999 x PPMI 1003 and ICMA 03999 x PPMI 1087, their F2s and backcross generations. All the F1s were completely fertile indicating complete fertility restoration. F2s and backcross generations were evaluated at IARI, New Delhi and IARI Regional Centre, Dharwad during summer 2017 and χ 2 test was applied to test the significance. At both the locations, all the F2 segregating populations fit well into a Mendelian ratio of 15:1 indicating digenic duplicate dominance of fertility restoring genes with χ 2 value of 0.82, 2.90, 0.04, 3.97, 4.86, 4.98, 0.02, 1.26, 3.15, 4.98, 3.15 and 0.02. The F2 hypothesis was verified with the observed frequency of segregating plants fitting well into 3:1 ration with χ 2 value of 5.45, 1.93, 4.93, 0.60, 2.83, 0.44, 4.94, 2.77, 3.33, 0.13, 4.08 and 1.51. It is further confirmation of the findings that fertility restoration is indeed governed by two duplicate genes. Association between pollen fertility and seed set per cent was significant and positive.


1936 ◽  
Vol 63 (6) ◽  
pp. 901-921 ◽  
Author(s):  
Paul D. Rosahn ◽  
Harry S. N. Greene

Observations were made on 475 fetuses carried by 71 pregnant rabbits. 63 or 88.7 per cent of the 71 does were sacrificed from 28 to 31 days after the last fertile mating, and these does bore 401 or 88.2 per cent of the total of 455 fully developed fetuses. The following information was available with reference to each fetus: age, weight, weight of corresponding placenta, horn, i.e., right or left, presentation, and position or order. The presentation indicated that part, head or breech, which was directed toward the vagina, and position or order, the relative locus of the fetus in the horn, the first position being that nearest the ovary. As the gestation period approached its normal limit of 31 days, the relative daily increase in mean fetal weight was progressively retarded. There was no significant difference between the number of fetuses in each uterine horn. Head presentation was significantly more frequent than breech, but the uterine horn in which the fetus was located had no influence on its presentation. A greater relative number of breech presenting fetuses was observed in the third position than in the other positions. Presentation did not exert a significant influence on fetal weight. Fetal weight at or near term was significantly influenced by the position or order in the uterine horn. In general, the weights of fetuses implanted high up nearest the ovary were greater than those developing nearest the outlet, and fetuses occupying intermediate positions had intermediate weights. When, however, only two fetuses were present in a horn, position had no effect on their weights. A significant positive coefficient of correlation was observed between fetal and placental weights. Moreover, placental weight was influenced by position in the uterine horn in exactly the same manner that fetal weight was so influenced. The factors which produced variability in fetal weight at or near term, did not account for the abnormally low birth weights of the dwarf rabbits observed in this laboratory.


1979 ◽  
Vol 21 (3) ◽  
pp. 417-422 ◽  
Author(s):  
G. J. Scoles ◽  
L. E. Evans

Three inbred lines of rye (Secale cereale L.) known to be capable of restoring fertility to a cytoplasmic male-sterile line were crossed with the sterile line. The proportions of male fertile, partially male fertile and male sterile plants in F2 and backcross progenies indicated that three dominant restorer genes were present in each line. These were designated Rf1, Rf2 and Rf3, their relative expressivity was Rf1>Rf2>Rf3. Expressivity was dependent upon environment. Partial fertility occurred when certain genotypes carried two of the three alleles as dominant, but was dependent upon genotype and environment.


2015 ◽  
Vol 12 (4) ◽  
pp. 801-808
Author(s):  
Kenneth Carlberg

Abstract This paper proposes a new direction for U.S. Government cyber policy focusing on stimulus that indirectly incites actions by others to improve cybersecurity protection. To date, the U.S. government has relied on two directions to establish a foundation for cyber security policy: legislative and informative. The former is realized as legislative laws or regulation that provide specific direction to companies or the general public. The latter involves the production and dissemination of information, which is realized in three forms: guidelines, response efforts, and testbeds/pilots. This paper proposes a new “carrot and stick approach” that incorporates both taxes and tax rebates to stimulate solutions that address problems without the government dictating a specific solution.


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