Examinando por Materia "Morphology"

Mostrando 1 - 3 de 3

Characterization of Coffea arabica L. parent plants and physicochemical properties of associated soils, Peru
(Cell Press, 2022-10-03) Alvarado Chuqui, Wigoberto; Bobadilla Rivera, Leidy Gheraldine; Valqui Valqui, Leandro; Silva Valqui, Gelver; Valqui Valqui, Lamberto; Vigo Mestanza, Carmen Natividad; Vásquez Pérez, Héctor Vladimir
It is important to carry out the morphological characterization of coffee parent plants and the physicochemical properties of the associated soils in the Amazon region, Peru, in order to achieve germplasm conservation. One hundred coffee mother plants were identified and located in five provinces of the region and evaluated according to morphological descriptors such as stipula shape, young leaf color, leaf shape, leaf apex shape, young shoot color, leaf color, fruit color, fruit shape, mature leaf color, and rust incidence percentage. In the plots where the parent plants were located, soil sampling was carried out to determine the physical and chemical properties. The varieties with the greatest presence in the five provinces were Típica and caturra roja, with the greatest number of specimens reported for the province of Bagua. The predominant stipule shape was triangular (91%), lanceolate leaf shape (60%) and red fruit color (90%). Bongará reported the lowest incidence of yellow rust, as well as the Mundo Novo Rojo variety. Soil pH ranged from acidic to neutral values, low electrical conductivity, high organic matter content, low phosphorus content, high potassium levels and medium cation exchange capacity. The predominant textural class was sandy loam. The physical and chemical characterization of the soils under study show favorable ranges to encourage the best development of coffee cultivation.
Evaluación agronómica de tres ecotipos locales de cañihua (Chenopodium pallidicaule Aellen) en la comunidad altoandina de Huarcapata, Espinar – Cusco
(Facultad de Ciencias Agrarias - Universidad Nacional del Altiplano, 2026-08-12) Mamani Aguilar, Mery Maribel; Tuni Ramos, Rosa Agustina; Huisa Huarca, Marck Oscar
El objetivo de la investigación fue evaluar el rendimiento y caracterizar morfológicamente tres ecotipos locales de cañihua (Chenopodium pallidicaule Aellen) en condiciones agroclimáticas altoandinas, durante la campaña agrícola 2024-2025; en Huarcapata, Espinar Cusco a 4045 msnm se evaluaron los ecotipos "Yauri", "Toclla" y "Tocroyo" bajo un diseño de bloque completo al azar con tres repeticiones. Se midió el rendimiento de grano (kg/ha) y se caracterizaron variables morfológicas (forma de hoja, altura, dehiscencia, color de perigonio y pericarpio, forma del grano) siguiendo descriptores estandarizados del IPGRI/PROINPA. El análisis estadístico incluyó ANOVA y prueba de Tukey (p<0.05). Los resultados indican diferencias significativas (p<0.01) en rendimiento y altura. "Toclla" presentó el mayor rendimiento 1920 kg/ha y altura 37 cm, con dehiscencia persistente grado 7. "Yauri" rindió 1800 kg/ha y "Tocroyo" 1280 kg/ha, ambos con dehiscencia regular grado 5. Los tres ecotipos mostraron hábito de crecimiento "lasta" y forma de grano sub-lenticular, con variabilidad en colores. El ciclo fenológico fue de 158 días. Se concluye que los ecotipos, especialmente "Toclla", superan ampliamente el rendimiento promedio, demostrando alto potencial productivo y adaptación a condiciones agroclimáticas adversas, la baja dehiscencia es un carácter valioso para la cosecha. Estos resultados destacan la importancia de la selección de ecotipos locales para mejorar la sostenibilidad del cultivo en los Andes.
On the synonymy between Agistemus manjilicus Khanjani, Hajizadeh & Zarei, 2015 and A. mendozensis Simons, 1967 (Acariformes: Stigmaeidae)
(Acarologia (Open Science in Acarology), 2026-06-26) Escobar Garcia, Hector Alonso; Ueckermann, Edward A.
The genus Agistemus Summers (Acari: Stigmaeidae) comprises predatory mites widely distributed in various agroecosystems. Agistemus manjilicus Khanjani, Hajizadeh & Zarei was described from Iran and differentiated from related species based on subtle morphological traits. However, a detailed comparison with A. mendozensis Simons reveals substantial overlap in diagnostic characters. In this study, we re-evaluated the taxonomic status of A. manjilicus through a comparative analysis of morphological characteristics, idiosomal dorsal setae measurements, diagnostic ratios, and leg chaetotaxy. Our results indicate that all distinguishing characters fall within the range of intraspecific variation of A. mendozensis. No consistent differences were found in key diagnostic traits such as dorsal setae morphology, diagnostic ratios, and leg chaetotaxy. Based on these findings, Agistemus manjilicus Khanjani, Hajizadeh & Zarei n. syn. is herein considered a junior subjective synonym of A. mendozensis Simons. This synonymy contributes to a more stable taxonomy within the genus and highlights the importance of comprehensive morphological comparisons in species delimitation.