Crecimiento y distribución de materia seca en cultivares de fresa (Fragaria sp.) bajo estrés salino
ABSTRACT Ferti-irrigation often results in salts accumulating in strawberry culture soil. Strawberry cultivars (Fragaria sp.) response to increasing levels of NaCl was studied in a greenhouse experiment. ‘Sweet Charlie’, ‘Camarosa’ and ‘Chandler’ strawberry cultivars were grown in pots filled with soil in Tunja, Colombia. The soil in pots was gradually salinised by NaCl adding 0, 20, 40, 60 and 80 mM· kg-1 of air dried soil. Plants were harvested 16 weeks after the treatment was begun. The accumulation of dry matter was measured in leaves, crowns, flowers, roots and fruits, as well as total leaf area, necrotic leaf area, specific leaf weight, dry and fresh weight per fruit and shoot:root ratio. The results revealed that salt accumulation in strawberry plants depressed vigour, retarded growth and reduced the production of dry matter. There was frequent mild to severe burning of leaf edges depending on salt concentration in the soil. ‘Sweet Charlie’ was more tolerant to salt stress compared to the other cultivars tested
SourceAvailable from: Fánor Casierra-Posada[Show abstract] [Hide abstract]
ABSTRACT: Seedlings of guava plants (Psidium guajava L. cv. Palmira ICA-1) were grown under 0, 20, 40, 60 and 80 mM NaCl (ECe: 1.2, 3.0, 5.4, 7.9 and 10.5 dS.m-1 respectly of a saturated soil extract) in glasshouse in Tunja / Colombia. Plants grew in pots with soil, which was slowly salinized four weeks after planting. Root to shoot ratio, leaf area, dry matter production and partitioning, and specific leaf weight were evaluated under salinity 240 days after sowing. Salinity significantly reduced total dry matter production, leaf area and specific leaf weight of plants. Root and shoot were also affected by salinity, which had an impact on the root to shoot ratio. NaCl salinity induced little changes in dry matter partitioning. The results suggest that guava cultivar Palmira ICA-1 is relatively tolerant to NaCl salinity.
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ABSTRACT: The genus Furcraea is a member of Agavaceae family endemic to Tropical America, especially to the Andean region of Colombia and Venezuela, although naturally is distributed from Mexico down to Brazil. A number of Furcraea species are cultivated in warm climates worldwide as ornamentals and for leaf fibers. In order to determine physiological responses to salinity, plants of local furcraea species (Furcreaea castilla, F. macrophylla, and F. cabuya) were exposed to 20, 40, 60, or 80 millimolar NaCl for five months. Control plants were salt-untreated. The experiment was carried out in a greenhouse in Tunja, Colombia. Plants were obtained from bulbils and grown in pots with soil that were irrigated two times a week and the water excess was avoided after induced soil salinization. Results showed that increased salinity in soil reduced total dry matter production, agronomic water use efficiency (WUE), root-shoot ratio, specific leaf density, and leaf area. Additionally, the NaCl salinity modified dry matter partitioning pattern in the evaluated species. Evapotranspiration was slightly influenced by salinity. The studied species showed genotypic differences in salt tolerance for most of the evaluated parameters.
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ABSTRACT: Banana passionfruit (Passiflora tripartita (Juss.) var. mollissima (Kunth)) is an important crop in Colombia, with Boyacá Department contributing over half of national production. Osmotic stress is a major hindrance to production of this crop, but there exists little information on banana passionfruit responses to soil salinity. The present study aimed to evaluate growth and chlorophyll fluorescence in banana passionfruit under salt stress. A completely randomized block design was used. Plants were exposed to concentrations of 20, 40, 60, and 80 mmol NaCl kg-1 soil. Leaf area was reduced by 20.89, 42.91, 58.37, and 76.40%, respectively, compared to control plants in non saline conditions. Total stem length showed a reduction of 9.97, 27.28, 42.79, and 55.77%, and total dry weight per plant was reduced by 23.89, 31.49, 39.60, and 61.26%. Maximum quantum yield of photosystem II (Fv/Fm) was reduced by 11.29, 14.23, 38.89, and 92.25% under the respective treatments. Salinity thus affected all measured growth factors and photosynthesis drastically. Leaf area reduction was closely correlated to reduction in photosynthesis. Dry matter reduction also closely followed the trend in Photosystem II maximum quantum yield (Fv/Fm), which suggests that the major impact of salinity on the banana passionfruit plants was due to negative effects on photosynthesis