Variación fenotípica y rendimiento de Jatropha curcas L. introducida a Túnez

Abstract

Se sembraron en el sur de Túnez (Gabès) semillas de ocho accesiones de Jatropha curcas (seis americanas y dos africanas) para estudiar sus propiedades agrícolas y desarrollo en condiciones locales semiáridas. Los caracteres observados incluyen aspectos generales del desarrollo de planta (altura, circunferencia del follaje, número de nodos y producción de semillas); características de las hojas (longitud del peciolo, longitud del limbo, anchura del limbo y superficie foliar); y caracteres de la semilla (tamaño y forma). El análisis morfológico de las semillas incluyó el área de las imágenes, el perímetro, la relación longitud/anchura, el índice de circularidad y el índice J. Este índice refleja la semejanza de las imágenes de cada semilla con una elipse mostrando diferencias en la forma de las mismas entre accesiones. Los genotipos de J. curcas introducidos en Túnez son polimórficos, su producción de semilla es baja y variable entre genotipos. El análisis morfológico de las semillas da una idea en relación con la producción en algunas de las accesiones. Estudios agronómicos comparativos son cruciales antes de la selección.

Evaluation of Growth Parameters for Jatropha curcas L. (Biofuel Plant) under Salinity and Water Stress Using Tensiometer for Irrigation Guiding

“…Also, Significant (p < 0.05) positively correlations were found between leaf dry weight and both of total leave area and relative growth rate, 0.955 and 0.500, respectively. This result is in agreement with those obtained by Pinheiro et al (2008), Saadaoui et al (2015) and Kotoky et al (2015). Pinheiro et al (2008), found that dry matter accumulation of leaves, as well as the total dry matter, increased with plant growth in salt treatments, while, these parameters were lowered in salt-stressed seedlings.…”

Morphological and molecular characterization of Jatropha curcas L. germplasm in Botswana

“…Such wide variation in the species was not surprising because the characters are predominantly influenced by environment (Ovando-Medina et al, 2011). The trend has been reported previously by several authors for different characters in different population of J. curcas (Kaushik et al, 2007;Guan et al, 2013;Saadaoui et al, 2015). In addition, low coefficients of variation were revealed by number of leaf lobes, seed length, and number of seed per fruit and this indicated that a narrow variation existed among accessions for the characters.…”

“…This indicated that substantial amount of genetic variability existed in the accessions. Saadaoui et al (2015) investigated five characters of J. curcas, foliar surface area, leaf length, leaf width, petiole length and number of nodes, and all of them revealed high morphological variability (P<0.05) among the eight accessions in Tunisia. Similarly, Guan et al (2013) found that five seed traits (seed weight, seed length, seed width, lateral diameter, seed length and width ratio) were significantly different among eight populations of J. curcas in China.…”

Stone diversity in wild and cultivated olive trees (Olea europaea L.)

“…The shape of seeds in model species was quantified by comparison with a cardioid (Cervantes et al, 2010;Cervantes et al, 2012) thus allowing to accurately measure changes in seed shape in mutants, during development or in response to environmental conditions or stress situations (Martín et al, 2014). In addition comparison of seed images with geometric figures allows the identification of features between subspecies and varieties (Saadaoui et al, 2013), changes to growth conditions (Saadaoui et al, 2015) or particular climatic adaptations (Martín Gómez et al, 2016). In general, seed shape has less variation than size, but Branch with fruits, leaves, fruits and seeds.…”