Bernini C.S.,Instituto Agronomico IAC |
Duarte A.P.,Agencia Paulista de Tecnologia do Agronegocio APTA Regional |
Gallo P.B.,APTA Regional |
Guimaraes P.S.,Instituto Agronomico IAC |
Rovaris S.R.S.,Instituto Agronomico IAC
Bragantia | Year: 2013
Heterosis and inbreeding depression are complementary phenomena, both important to the establishment of breeding strategies, such as conventional hybrids and population breeding. This study aimed to evaluate the agronomic traits of hybrids in F2 populations, estimate of heterosis in relation to the average of the parents and determine the inbreeding depression in F2 parents populations. Ten hybrids of F2 populations, five F2 parents populations and the respective commercial hybrids (HC) were evaluated for male flowering, plant height, ear height and grain mass. Plants were evaluated in Mococa and Palmital counties at the Sao Paulo State and the experiment was arranged in a completely randomized block design. The estimated inbreeding depression from F1 to next F2 generation ranged from 18.0% in HC12 to 48.1% in HC10 for grain mass. The heterosis in relation to the parents' mean was 37.2%, represented by high yield in F2 hybrids. Based on these results, it was possible to highlight two hybrids of F2 populations with high yield potential, high average heterosis and F2 populations with potential for extraction of inbred lines.
David C.M.G.,Institute Zootecnia |
da Costa R.L.D.,Institute Zootecnia |
Parren G.A.E.,Institute Zootecnia |
Rua M.A.S.,Institute Zootecnia |
And 3 more authors.
Tropical Animal Health and Production | Year: 2015
The aim of this study was to evaluate the effects of supplementation with silage made from sugarcane alone or mulberry and sugarcane on the gastrointestinal nematodes and hematological parameters in peripartum Santa Inês ewes. Three groups, each of 15 ewes, were supplemented with either 100 % sugarcane silage or sugarcane silage and mulberry at ratios of either 75:25 or 50:50. The variables analyzed were weight, body condition, packed cell volume, total plasma protein, hemoglobin, total leukocytes, eosinophils, and number of parasite eggs per gram of feces. All variables were measured individually every 14 days, making ten samples per ewe. Diets with sugarcane added to different proportions of mulberry branches did not influence the blood and parasitological parameters of Santa Inês sheep naturally infected in the peripartum period. © 2015, Springer Science+Business Media Dordrecht.
Raga A.,Biological Institute |
De Souza-Filho M.F.,Biological Institute |
Strikis P.C.,University of Sao Paulo |
Montes S.M.N.M.,APTA Regional
Entomotropica | Year: 2015
Many species of Lonchaeidae predominate in the complex of fruit flies (Tephritoidea) infesting more species of host fruits that the species of Tephritidae. In the southern hemisphere, very little is known about the diversity of the species of Lonchaeidae and their host relationship. This paper records the species of Lonchaeidae and their respective host plants as recovered out of a total of 1,522 samples of fruit relating to 113 plant species coming from 94 municipalities of the State of São Paulo, Brazil. A total of 26,906 Lonchaeidae adults were obtained, belonging to 14 species of Neosilba McAlpine, Dasiops inedulis Steyskal, Dasiops frieseni Norrbom & McAlpine and Lonchaea sp. Specimens of Neosilba represented 99.78 % of the adults recovered: N. bella Strikis & Prado, N. bifida Strikis & Prado, N. certa (Walker), N. cornuphallus Strikis, N. dimidiata Curran, N. inesperata Strikis & Prado, N. glaberrima (Wiedemann), N. laura Strikis, N. paramerolatus Strikis, N. parva Hennig, N. pradoi Strikis & Lerena, N. pendula (Bezzi), N. perezi (Romero & Ruppel) and N. zadolicha McAlpine & Steyskal. Neosilba zadolicha is predominant, abundant and generalist species. © 2015, Sociedad Venezolana de Entomología.
Dudienas C.,Instituto Agronomico Of Campinas |
Fantin G.M.,Instituto Biologico |
Duarte A.P.,APTA Regional |
Ticelli M.,APTA Regional |
And 6 more authors.
Summa Phytopathologica | Year: 2013
Southern rust, caused by Puccinia polysora Underw., has become one of the most destructive diseases affecting maize, occurring in important areas of production of this crop in Brazil. Using resistant cultivars is the most efficient means to control this disease, and there are a large number of cultivars with different resistance degrees in the market. The aim of this study was to evaluate the reaction of commercial maize cultivars for resistance to southern rust in different localities of São Paulo State, correlated to yield. A total of 50 simple and triple hybrids (HST) and 22 double hybrids and varieties of maize (HDV) in use by farmers were evaluated in 2005/2006 for their reaction to southern rust in six locations in western and north-central regions of São Paulo State. In the experiments with HST, the most resistant cultivars with the highest yields were: 30F80, 30F90, 30K73, AG 7000, DAS 2B710, DKB 191, DKB 466 and Impacto. Among HDV, the most resistant ones presenting the highest yields were: 30S40 and AG 2040. Yield losses due to the severity of southern rust, assessed in the stage of pastry grain, ranged from 3.5%, for cultivars with approximately 2.5% of leaf area affected by the disease, to 20.3% for cultivars with 39% of the leaf area affected, compared to cultivars of higher resistance to the disease (1.4% affected leaf area).
Ram H.,Punjab Agricultural University |
Rashid A.,Pakistan Academy of science |
Zhang W.,China Agricultural University |
Duarte A.P.,Agronomic Institute IAC |
And 17 more authors.
Plant and Soil | Year: 2016
Aims: Rice (Oryza sativa L.), wheat (Triticum aestivum L.) and common bean (Phaseolus vulgaris L.) are major staple food crops consumed worldwide. Zinc (Zn) deficiency represents a common micronutrient deficiency in human populations, especially in regions of the world where staple food crops are the main source of daily calorie intake. Foliar application of Zn fertilizer has been shown to be effective for enriching food crop grains with Zn to desirable amounts for human nutrition. For promoting adoption of this practice by growers, it is important to know whether foliar Zn fertilizers can be applied along with pesticides to wheat, rice and also common bean grown across different soil and environmental conditions. Methods: The feasibility of foliar application of zinc sulphate (ZnSO4.7H2O) to wheat, rice and common bean in combination with commonly used five fungicides and nine insecticides was investigated under field conditions at the 31 sites-years of seven countries, i.e., China, India, Pakistan, Thailand, Turkey, Brazil and Zambia. Results: Significant increases in grain yields were observed with foliar Zn/foliar Zn + pesticide (5.2–7.7 % of wheat and 1.6–4.2 % of rice) over yields with no Zn treatment. In wheat, as average of all experiments, higher grain Zn concentrations were recorded with foliar Zn alone (41.2 mg kg−1) and foliar Zn + pesticide (38.4 mg kg−1) as compared to no Zn treatment (28.0 mg kg−1). Though the magnitude of grain Zn enrichment was lesser in rice than wheat, grain Zn concentrations in brown rice were significantly higher with foliar Zn (24.1 mg kg−1) and foliar Zn + pesticide (23.6 mg kg−1) than with no Zn (19.1 mg kg−1). In case of common bean, grain Zn concentration increased from 68 to 78 mg kg−1 with foliar Zn alone and to 77 mg kg−1 with foliar Zn applied in combination with pesticides. Thus, grain Zn enrichment with foliar Zn, without or with pesticides, was almost similar in all the tested crops. Conclusions: The results obtained at the 31 experimental site-years of seven countries revealed that foliar Zn fertilization can be realized in combination with commonly-applied pesticides to contribute Zn biofortification of grains in wheat, rice and common bean. This agronomic approach represents a useful practice for the farmers to alleviate Zn deficiency problem in human populations. © 2016 Springer International Publishing Switzerland