Abstract

Biostimulants can have physiological effects on plants that improve yield,quality, and nutrients use efficiency. The mechanisms activated by these compoundsare unknown and are difficult to identify, because the most part of these substances iscomposed mainly by plant extracts, algae extracts, amino acids, vitamins and mineralnutrients. Therefore, their effect is the result of many components that may worksynergistically. In the recent years, the biostimulants are gaining importance for theirpossible use in organic and sustainable agriculture. The results of a study conductedto assess the interactive effects of irrigation regime, leaf application of a biostimulantbased on brown seaweed extract and nitrogen rate on leaf net photosynthesis (A),transpiration (T), stomatal conductance (gs), internal CO2 concentration (Ci) andintrinsic water use efficiency (WUEi), are reported. The research was carried outduring November-February 2016-2017, under greenhouse located in southern Italy.Two irrigation regimes (restoration of 100 and 50% of crop evapotranspiration,respectively named I100 and I50), two leaf biostimulant application (Bioproject SM23-BioKimia® International S.r.l., and a control without biostimulant, respectively namedB and C) and three nitrogen rates (0, 75 and 150 kg ha-1 N, respectively named N0, N1and N2) on wild rocket [Diplotaxis tenuifolia (L.) DC.] grown in pots, were compared. Asplit plot experimental design with three reps was utilized. All treatments affected gasexchange parameters. I50 in respect to I100 reduced A, T and gs, but improved WUEi, andthe differences were raised with increasing soil water content gap betweentreatments. N rate increase improved A but, in condition of high water stress, thehigher N rate was detrimental. Biostimulant improved A by 8.9% and WUEi by 7.5%,and the positive effect was greater in water shortage conditions. Positive effects ofBioproject SM23® on A and WUEi suggest its use to improve the performances of wildrocket and mitigate harmful effects of water stress.

Autore Pugliese

• Cantore Vito

Tutti gli autori

• Schiattone M.I.; Leoni B.; Cantore V.; Todorovic M.; Perniola M.; Candido V.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2018

ISSN

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ISBN

978-94-62611-98-6

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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