Can biostimulants and grafting alleviate salinity stress in purple passion fruit (Passiflora edulis f. edulis Sims)?
Purple passion fruit crops are affected by salinity conditions in productive systems. The aim of this research was to evaluate the effect of the application of Ascophyllum nodosum extract on salinity stress in purple passion fruit plants at the vegetative stage of growth with and without grafting. Eight treatments were evaluated corresponding to the combination of grafting or non-grafting on the Passiflora maliformis rootstock, the presence or absence of salt stress, and the application or not of the A. nodosum biostimulant. Physiological and growth parameters were evaluated. Salinity significantly decreased (P<0.05) growth and stomatal conductance (gs), increased contents of photosynthetic pigments and did not affect the chlorophyll a fluorescence. The grafted plants presented a positive response (P<0.05) in chlorophyll relative contents (~63 SPAD units) and shoot length (~106 cm); lower gs (~163 mmol H2O m-2s-1), number of leaves (~43 leaves) and root weight (3.5 g of dry weight), and no change in chlorophyll a fluorescence. The biostimulant mitigated the salinity effect on gs and photosynthetic pigments. In the case of salinity, non-grafted purple passion fruit may present a better performance at the vegetative stage, and the biostimulant can have a slight mitigation effect on salt stress. However, if it is essential to use grafted plants for sanitary reasons, the evaluated salinity does not affect them drastically.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | eng |
| Published: |
Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias Agrarias
2024
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| Online Access: | https://revistas.unal.edu.co/index.php/agrocol/article/view/113585 |
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