3 research outputs found

    Polyembryony in Maize: A Complex, Elusive, and Potentially Agronomical Useful Trait

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    Polyembryony (PE) is a rare phenomenon in cultivated plant species. Since nineteenth century, several reports have been published on PE in maize. Reports of multiple seedlings developing at embryonic level in laboratory and studies under greenhouse and field conditions have demonstrated the presence of PE in cultivated maize (Zea mays L.). Nevertheless, there is a lack of knowledge about this phenomenon; diverse genetic mechanisms controlling PE in maize have been proposed: Mendelian inheritance of a single gene, interaction between two genes and multiple genes are some of the proposed mechanisms. On the other hand, the presence of two or more embryos per seed confers higher nutrimental quality because these grains have more crude fat and lysine than normal maize kernels. As mentioned above, there is a necessity for more studies about PE maize in order to establish the genetic mechanism responsible for this phenomenon; on the other hand, previous studies showed that PE has potential to generate specialized maize varieties with yield potential and grain quality

    An谩lisis gen茅tico y bromatol贸gico de mutantes de manzano (Malus x domestica Borkh) del cultivar golden delicius

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    The apple tree (Malus x domestica Borkh) is an important fruit tree in southern Coahuila, Mexico. For flowering, it requires an accumulated number of cold air units (CAUs) which the CAUs of the region do not achieve to reach, leading to a low production. Mutations have been detected in the region that require less CAUs. The objective of this work was to determine the genetic and bromatological differences of the southern Coahuila mutants. The bromatological analysis showed that the mutant Vigas I has a lower fiber content (4.91 g) and the highest sugar content (10.73 g), which provide it with marketing advantages. The analysis of amplified length fragment polymorphisms (AFLPs), showed a larger banding pattern with the combination [EcoRI (+ACC +AGG) / Msel (+CTA)]. This combination yielded 123 amplified, 100 % polymorphic bands. The mutant closer to the control was Vigas II, with a genetic distance of 0.16 units, while the mutant with the greatest difference was Primicia. The studied mutants might be an alternative to the CAU issue in some apple tree regions of the country.El manzano (Malus x domestica Borkh) es un frutal importante en el sur de Coahuila, M茅xico; que para su floraci贸n necesita la acumulaci贸n de unidades fr铆o (UF), las cuales no se logran cubrir con las UF de la regi贸n, lo que ocasiona baja producci贸n. En los 煤ltimos a帽os en la regi贸n se han detectado mutaciones que necesitan menores UF. El objetivo del presente trabajo fue determinar diferencias gen茅ticas y bromatol贸gicas en los mutantes del sur de Coahuila. El an谩lisis bromatol贸gico mostr贸 que el mutante Vigas I present贸 el menor contenido de fibra (4.91 g) y el mayor contenido de az煤cares (10.73 g), lo que le da ventajas comerciales. El an谩lisis de polimorfismos en la longitud de fragmentos amplificados (AFLP's), mostr贸 un mayor patr贸n de bandeado con la combinaci贸n: [EcoRI (+ACC +AGG) / Msel (+CTA)]. Obteni茅ndose con esta combinaci贸n 123 bandas amplificadas, las cuales fueron 100 % polim贸rficas. El mutante m谩s parecido al control fue Vigas II con una distancia gen茅tica de 0.16 unidades, mientras que el mutante con mayor diferencia fue Primicia. Los mutantes estudiados pueden ser una alternativa a la problem谩tica de UF de algunas regiones manzaneras de pa铆s

    An谩lisis gen茅tico y bromatol贸gico de mutantes de manzano (Malus x domestica Borkh) del cultivar golden delicius

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    The apple tree (Malus x domestica Borkh) is an important fruit tree in southern Coahuila, Mexico. For flowering, it requires an accumulated number of cold air units (CAUs) which the CAUs of the region do not achieve to reach, leading to a low production. Mutations have been detected in the region that require less CAUs. The objective of this work was to determine the genetic and bromatological differences of the southern Coahuila mutants. The bromatological analysis showed that the mutant Vigas I has a lower fiber content (4.91 g) and the highest sugar content (10.73 g), which provide it with marketing advantages. The analysis of amplified length fragment polymorphisms (AFLPs), showed a larger banding pattern with the combination [EcoRI (+ACC +AGG) / Msel (+CTA)]. This combination yielded 123 amplified, 100 % polymorphic bands. The mutant closer to the control was Vigas II, with a genetic distance of 0.16 units, while the mutant with the greatest difference was Primicia. The studied mutants might be an alternative to the CAU issue in some apple tree regions of the country.El manzano (Malus x domestica Borkh) es un frutal importante en el sur de Coahuila, M茅xico; que para su floraci贸n necesita la acumulaci贸n de unidades fr铆o (UF), las cuales no se logran cubrir con las UF de la regi贸n, lo que ocasiona baja producci贸n. En los 煤ltimos a帽os en la regi贸n se han detectado mutaciones que necesitan menores UF. El objetivo del presente trabajo fue determinar diferencias gen茅ticas y bromatol贸gicas en los mutantes del sur de Coahuila. El an谩lisis bromatol贸gico mostr贸 que el mutante Vigas I present贸 el menor contenido de fibra (4.91 g) y el mayor contenido de az煤cares (10.73 g), lo que le da ventajas comerciales. El an谩lisis de polimorfismos en la longitud de fragmentos amplificados (AFLP's), mostr贸 un mayor patr贸n de bandeado con la combinaci贸n: [EcoRI (+ACC +AGG) / Msel (+CTA)]. Obteni茅ndose con esta combinaci贸n 123 bandas amplificadas, las cuales fueron 100 % polim贸rficas. El mutante m谩s parecido al control fue Vigas II con una distancia gen茅tica de 0.16 unidades, mientras que el mutante con mayor diferencia fue Primicia. Los mutantes estudiados pueden ser una alternativa a la problem谩tica de UF de algunas regiones manzaneras de pa铆s
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