Abstract
Abstract Phyto-hormones play a key role in regulating plant responses to stress. Cytokines are a type of phyto-hormones involved in the regulation of many important biological processes related to growth, development, and response to environmental variables. The exogenous application of cytokines increases the possibility of delaying senescence; however, this is a physiological process, and, under certain conditions, degradation processes may be triggered. The effect of 6-bencilaminopurine application and the endogenous hormonal changes involved in lilies floral stalks after their cutting were studied. In order to improve vase life and quality of Lilium longiflorum ‘Brindisi’ flower stalks, they were sprayed with 6-BAP, at a concentration of 300 ppm at pre-harvest, post-harvest, and pre- and post-harvest stages. After that, they were compared to non-sprayed control stalks. The application of 6-BAP caused endogenous hormonal changes in abscisic acid and cytokinin levels, and the most effective treatment was pre-harvest spraying. This treatment proved to be an appropriate method to improve the stalk tolerance to post-harvest stress as it delayed the appearance of senescence symptoms and reduced the speed of chlorophyll degradation with differences of up to 10% with respect to untreated stalks. In addition, the opening of flowers was delayed by up to 2 days, although there were no significant differences in total vase life.
Highlights
Lilies (Lilium sp.) have a worldwide demand due to their high commercial and ornamental value
The quality and vase life of cut stalks are affected by pre- and post-harvest factors (Hajizadeh, 2016)
Enzymes, mechanical damage and/or environmental factors; all physiological responses are considered to be influenced by plant hormones (Lymperopoulos et al, 2018)
Summary
Lilies (Lilium sp.) have a worldwide demand due to their high commercial and ornamental value. The quality and vase life of cut stalks are affected by pre- and post-harvest factors (Hajizadeh, 2016). This deterioration of cut flowers that affects the growth and development of plants is attributed to changes in the effects of endogenous. HORMONAL ENDOGENOUS CHANGES IN RESPONSE TO THE EXOGENOUS 6-BENZYLAMINOPURINE APPLICATION IN PRE- AND POST-HARVESTING LILIUM FLOWER STALKS enzymes, mechanical damage and/or environmental factors; all physiological responses are considered to be influenced by plant hormones (Lymperopoulos et al, 2018). Cytokinins (CK) have profound effects on almost every biological event during plant development and defense, floral organ maturation and abscission, leaf/flower senescence, and in responses to various biotic and abiotic stresses (Smith et al, 2017; Bengoa Luoni et al, 2019). Today cytokinins are known to regulate the metabolism and transport of amino acids and carbohydrates important for plant growth, as well as several macronutrients, including nitrogen, phosphorus, sulphur, and iron (Albrecht and Argueso, 2017)
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