Novel Arabidopsis mutants with lowered levels of endogenous abscisic acid (ABA) were isolated. These were selected in a screen for germination in the presence of the gibberellin biosynthesis inhibitor paclobutrazol. Another mutant was isolated in a screen for NaCl tolerance. The ABA-deficiency was caused by two monogenic, recessive mutations, aba2 and aba3, that were both located on chromosome 1. The mutants showed a phenotype that is known to be characteristic for ABA-deficiency: a reduced seed dormancy and excessive water loss, leading to a wilty phenotype. Double mutant analysis, combining different aba mutations, indicated the leaky nature of the mutations.
O objetivo deste trabalho foi identificar a presença dos genes Ty-2 e Ty-3, de resistência a begomovírus, em acessos de tomateiro do Banco de Germoplasma de Hortaliças da Universidade Federal de Viçosa. Os oligonucleotídeos TO302 F/R e FLUW25 F/R foram utilizados em reações de PCR, para verificar a presença de marcadores relacionados aos genes Ty-2 e Ty-3, respectivamente. Observou-se a presença do gene Ty-2, em heterozigose na subamostra BGH-6881 (Solanum peruvianum), e do gene Ty-3, em homozigose nas subamostras BGH-6878, BGH-6897 (S. lycopersicum) e em heterozigose na subamostra BGH-6881. A identificação dos genes de resistência, com reações de PCR, representa um avanço para os programas de melhoramento de tomateiro no Brasil.
Os begomovírus causam doenças de grande importância econômica em diversas culturas, principalmente em regiões tropicais e subtropicais. Juntamente com outras famílias de vírus, os begomovírus têm causado grande prejuízo para os produtores de tomate in natura e para processamento industrial. O objetivo deste trabalho foi avaliar o comportamento de 11 genótipos resistentes ao Tomato yellow leaf curl virus (TYLCV) frente à infecção pelos begomovírus Tomato yellow spot virus (ToYSV) e Tomato severe rugose virus (ToSRV) em condições de casa-vegetação. A inoculação das plantas foi realizada via biobalística no estádio de duas folhas verdadeiras. A infecção viral confirmou-se pelo desenvolvimento dos sintomas e pela técnica de hibridização dot blot. Selecionaram-se como promissores os genótipos STY2, STY5, STY6 e L7, por não apresentarem sintomas e por terem concentrações virais muito baixas para os dois vírus. O espectro de resistência dos genes Ty-1 e Ty-2 não resultaram efetivos ante as espécies virais empregadas no estudo. As linhagens TY52, H24 e CLN2116B, portadoras destes genes, foram suscetíveis aos vírus ToYSV e ToSRV.
The Center of Scientific Research of Yucatan (CICY) has released a new openpollinated cultivar of habanero pepper: Mayan Kisin. This is distinguished by its high performance, its bright red and very spicy fruit. 'Mayan Kisin' originated from four selection cycles carried out on landraces collected in the region of Valladolid, in the state of Yucatan, Mexico. Although the center of origin of Capsicum chinense is located in South America, in the area located between southern Brazil and eastern Bolivia, western Paraguay and northern Argentina (Aguilar-Rinc on et al., 2010), the Yucatan Peninsula is recognized as a center of genetic diversity of the species C. chinense Jacq. (Latournerie et al., 2001). In this region there are orange, red, yellow, and purple fruits of this species. It is said that the habanero pepper grown in the Yucatan Peninsula can be distinguished from habanero peppers grown in the region of the world, by its peculiar aroma, taste, and more particularly, its high level of pungency. Probably, the combination of soil and climate in the Yucatan Peninsula, located in the Mexican southeast, confers the habanero pepper cultivated in Yucat an Peninsula with characteristics that set it apart from habanero peppers cultivated in any other region of the world. These attributes allowed it to qualify for the Denomination of Origin Habanero Pepper of the Yucatan Peninsula, published by the Official Gazette of the Federation (DOF: 4 June 2010). Paradoxically, the cultivars of habanero, cultivated in the region, are characterized by their low yields, small and orange fruits, as well as the high variability
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.