Numero 176

Cari socie e soci,

il prossimo appuntamento dei VIRTUAL CLUB SIBV si svolgerà il 24 novembre 2022 dalle ore 17:00 alle ore 18:00 e sarà svolto dalla Dott. Silvana Francesca dell’Università degli Studi di Napoli Federico II.

Adaptive physiological responses of tomato plants to combined abiotic stress and biostimulant application

Silvana Francesca, PhD

Department of Agricultural Science, University of Naples Federico II

Prof Maria Manuela Rigano

Mail: silvana.francesca@unina.it

Drought and heat stresses are the main constrains to agricultural crop production worldwide. Precise and efficient phenotyping is essential to understand the complexity of plant responses to abiotic stresses and to identify the best management strategies to increase plant tolerance. An in-depth study was performed to investigate the effects of a protein hydrolysate-based biostimulant on the physiological response of two tomato genotypes (‘E42’ and ‘LA3120’) subjected to heat, drought and combined stress in open field and controlled conditions. Growth parameters and leaf gas exchange measurements revealed that the two genotypes used different physiological strategies to overcome individual and combined stresses. Activation of antioxidant defence mechanisms seemed to be critical for both genotypes to counteract combined abiotic stresses. After biostimulant application, its free amino acids stimulated growth in treated plants subjected to combined stress, probably promoting endogenous phytohormonal biosynthesis. Moreover, biostimulant application increased the net photosynthetic rate and maximal efficiency of PSII photochemistry under drought, possibly related to the presence of glycine betaine and aspartic acid in the protein hydrolysate. Increased antioxidant content and a decreased accumulation of hydrogen peroxide, proline, and soluble sugars demonstrated that the biostimulant application mitigated the negative effects of abiotic stresses in treated plants under drought and combined stress. Altogether, in this research a fine and multilevel phenotyping revealed increased plant performances under drought conditions and elevated temperatures induced by a protein hydrolysate, highlighting the great potential biostimulants have in improving plant resilience to abiotic stresses.

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Il Presidente, Laura De Gara                                                            Il Segretario, Sara Cimini