Three new teosintes (Zea spp., Poaceae) from México

Abstract

In this correspondence, a method is presented for estimating double-selective channels using superimposed training (ST). The estimator is based on a subspace projection of the time-varying channel onto a set of two dimensional orthogonal functions. These functions are formed via the outer product of the discrete prolate spheroidal basis vectors and the universal basis vectors. This approach allows the channel to be expanded in both the time-delay and time dimensions with the fewest parameters when incomplete channel statistics are given. This correspondence also provides a theoretical performance analysis of the estimation algorithm and its corroboration via simulations. It is shown that this new method provides an enhancement in channel estimation when compared with state-of-the-art approaches. " 2012 IEEE.",,,,,,"10.1109/TSP.2012.2195658",,,"http://hdl.handle.net/20.500.12104/45377","http://www.scopus.com/inward/record.url?eid=2-s2.0-84863915619&partnerID=40&md5=999d690a1bfc9798103a77e74fb5d946",,,,,,"8",,"IEEE Transactions on Signal Processing",,"4439

4443",,"60",,"Scopus

WOS",,,,,,"Discrete prolate spheroidal basis; orthogonal basis expansion; superimposed training; time-varying channel estimation; universal basis",,,,,,"Time-varying channel estimation using two-dimensional channel orthogonalization and superimposed training",,"Article" "47135","123456789/35008",,"Sánchez, J.J.G., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; de La Cruz, L.L., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; Vidal, V.A.M., Instituto Nacional de Investigaciones Forestales agrícolas y Pecuarias, Parque Los Colomos S/N, Col. Providencia, Guadalajara 44660 JAL, Mexico; Ron, J.P., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; Taba, S., Centro Internacional de Mejoramiento de Maíz y Trigo, Unidad de Recursos Genéticos, Apartado Postal 6-641, 06600 México, D.F., Mexico; Santacruz-Ruvalcaba, F., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; Sood, S., USDA-ARS Plant Science Research Unit, Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620, United States; Holland, J.B., USDA-ARS Plant Science Research Unit, Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620, United States; Ruíz, J.A.C., Instituto Nacional de Investigaciones Forestales agrícolas y Pecuarias, Parque Los Colomos S/N, Col. Providencia, Guadalajara 44660 JAL, Mexico; Carvajal, S., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; Aragón, F.C., USDA-ARS Plant Science Research Unit, Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620, United States; Chávez, V.H.T., Instituto Nacional de Investigaciones Forestales agrícolas y Pecuarias, Parque Los Colomos S/N, Col. Providencia, Guadalajara 44660 JAL, Mexico; Morales, M.M.R., Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, 15.5 Carretera Guadalajara-Nogales, C.P. 45110, Las Agujas, Zapopan, JAL, Mexico; Barba-González, R., Cen. de In. y Asistencia en Tecnologia y Diseno del Estado de Jalisco A.C., Av. Normalistas No. 800, Col. Colinas de la Normal, CP 44270 Guadalajara, JAL, Mexico",,"Sanchez, J.J.G.

de La Cruz, L.L.

Vidal, V.A.M.

Ron, J.P.

Taba, S.

Santacruz-Ruvalcaba, F.

Sood, S.

Holland, J.B.

Ruiz, J.A.C.

Carvajal, S.

Aragon, F.C.

Chavez, V.H.T.

Morales, M.M.R.

Barba-Gonzalez, R.",,"2011",,"Premise of the study: Teosinte species are the closest relatives of maize and represent an important but increasingly rare genetic resource for maize improvement and the study of evolution by domestication. Three morphologically and ecologically distinct teosinte populations were recently discovered in México. The taxonomic status of these rare and endangered populations was investigated by detailed comparisons to previously characterized wild Zea species.Methods: Three new teosinte populations were compared to known teosinte taxa on the basis of morphological, ecogeographic, cytological, and molecular characteristics. Phenetic and phylogenetic analyses were performed using morphological and molecular data, respectively.Key results: The newly discovered populations are distinct from each other and from other Zea species to represent three new entities based on their unique combinations of morphological, ecological, ploidy, and DNA markers. A perennial diploid population from Nayarit is distinguished by early maturing plants, and having male inflorescences with few tassel branches and long spikelets. A perennial tetraploid population from Michoacán is characterized by tall and late maturing plants, and having male inflorescences with many branches. An annual diploid population from Oaxaca is characterized by having male inflorescences with fewer branches and longer spikelets than those found in the sister taxa Z. luxurians and Z. nicaraguensis, plants with high thermal requirements, and very long seed dormancy.Conclusions: Evidence from multiple independent sources suggests placement of the three new populations of teosinte as distinct entities within section Luxuriantes of the genus Zea. However, more extensive DNA marker or sequence data are required to resolve the taxonomy of this genus. " 2011 Botanical Society of America.