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Stipa tenacissima Does not Affect the Foliar δ^(13)C and δ^(15)N of Introduced Shrub Seedlings in a Mediterranean Semi-arid Steppe

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Journal of Integrative Plant Biology 2006年第8期48卷 897-905页

作者： Fernando T.Maestre Susana Bautista Jordi Cortina Departamento de Ecologia Universidad de AlicanteApartado de correos 9903080 AlicanteSpain Department of Biology Duke UniversityPhytotron BuildingScience DriveBox 90340DurhamNorth Carolina 27708-0340USA Centro de Estudios Ambientales del Mediterraneo C/ Charles Darwin 1446980 PaternaSpain

Recent studies have shown that the tussock grass Stipa tenacissima L. facilitates the establishment of late-successional shrubs, in what constitutes the first documented case of facilitation of woody plants by grasses. With the aim of increasing our knowledge of this interaction, in the present study we investigated the effects of S. tenacissima on the foliar δ13C, δ15N, nitrogen concentration, and carbon ： nitrogen ratio of introduced seedlings of Pistacia lentiscus L., Quercus coccifera L., and Medicago arborea L. in a semi-arid Mediterranean steppe. Six months after planting, the values of δ13C ranged between -26.9‰ and -29.6‰, whereas those of δ15N ranged between -1.9‰ and 2.7‰. The foliar C ： N ratio ranged between 10.7 and 53.5, and the nitrogen concentration ranged between 1.0% and 4.4%. We found no significant effect of the microsite provided by S. tenacissima on these variables in any of the species evaluated. The values of δ13C were negatively correlated with predawn water potentials in M. arborea and were positively correlated with relative growth rate in Q. coccifera. The values of δ15N were positively correlated with the biomass allocation to roots in the latter species. The present results suggest that the modification of environmental conditions in the are surrounding S. tenacissima was not strong enough to modify the foliar isotopic and nitrogen concentration of shrubs during the early stages after planting.

关键词： facilitation Medicago arborea Pistacia lentiscus Quercus coccifera stable isotopes steppe Stipa tenacissima.

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The Beneficial Effect of Trichoderma spp. in Seed Treatment of Four Maize (Zea mays L.) Genotypes

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American Journal of Plant Sciences 2023年第6期14卷 625-637页

作者： José Luis Arispe-Vázquez Abiel Sánchez-Arizpe Daniel Alejandro Cadena-Zamudio Ma. Elizabeth Galindo-Cepeda David Heriberto Noriega-Cantú Oscar Guadalupe Barrón-Bravo Leslie Carnero-Avilés Juan Mayo-Hernández susana Elizabeth Ramírez-Sánchez Adriana Antonio-bautista Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Iguala de la Independencia Guerrero México Departamento de Parasitología Universidad Autónoma Agraria Antonio Narro Saltillo México Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Altamira México Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Delicias México Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Tepatitlán de Morelos Jalisco México Departamento de Fitomejoramiento Universidad Autónoma Agraria Antonio Narro Saltillo México

Maize is the main crop for Mexicans;however, it is affected by species of fungi causing ear rot. This research aimed to evaluate the effect of T. asperellum T11, T. harzianum T1 4 y T. longibrachiatum T1 40 on some agronomic variables of four maize genotypes. The seeds of the genotypes H-515, Zapata 7, and H-507 were treated with a suspension of Trichoderma spp. to 1 × 108 spores mL-1, using a control (untreated seed), and Benomyl as chemical control. The planting was in Morelos, in a completely random block design with a factorial arrangement. The ear rot was natural. Data were obtained at the end of the crop cycle and processed in SAS 9.4®. H-515 genotype had the greatest effect on the treatment of maize seeds with Trichoderma spp. (5.562 kg);T. asperellum T11 was the strain that stood out with a mean yield of 50 ears in an area of 16 m2 of 4.904 kg, and control of 4.448 kg. Our results are an economic option for farmers to contemplate the use of Trichoderma and obtain its benefits.

关键词： Seeds Treatment Trichoderma asperellum Ear Rot Yield

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Structural Bioinformatics of Protein &DNA, as Early Stimulation in Basic Education of Rural and Indigenous Communities of Oaxaca

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Engineering（科研） 2013年第10期5卷 255-258页

作者： susana Lozano-Muniz Maria del Carmen Urzua-Hernandez Biotechnology Institute Universidad del Papaloapan Tuxtepec Mexico International Foundation for Biotechnology Research & Early Stimulation in the Culture of Health Nutrition Sport Art Science Technology & Society A.C. San Juan Bautista Tuxtepec Mexico International Foundation for Biotechnology Research & Early Stimulation in the Culture of Health Nutrition Sport Art Science Technology & Society A.C. San Juan Bautista Tuxtepec Mexico Facultad de Quimica Universidad Nacional Autonoma de Mexico Ciudad de México Mexico

As stated in the Declaration of the Rights of the Child, children have the right to go to school for free, to play, and to have the same opportunity to develop and to learn to be responsible and useful[1]. Young children are curious by nature and they have passion for learning [2]. An environment that encourages scientific thinking is what gives young children the time, space and materials to exercise their curiosity [3]. The aim of this paper is to present a methodology for the development of educational environments based on digital technology, internet and free programs available on the web, for the use and application of structural bioinformatics protein and DNA, for early stimulation in basic education at rural and indigenous communities in state of Oaxaca, conducted in On Line Learning & Training “OLL & T”. The course is divided into 4 sections: 1)Introduction to the topic of protein and DNA structure;2)Search in protein data bank;3)Download RasTop program and use it as bioinformatics tool;4)Emulation of building a viral molecule. Workshops were given to children in elementary, middle and high school at the Universidad Del Papaloapan during the National Week of Science and Technology, every year in Oaxaca since 2007 to 2012 and in Monterrey 2010 at the Universidad Autonoma de Nuevo León. Conclusions: positive impact was achieved in basic education in the area of natural sciences by analyzing the molecular basis of protein and deoxyribonucleic acid, theoretically and practically, as a support for teachers.

关键词： TICs Childhood Improvement Achievement

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