Pear (Pyrus communis L.) micropropagation still shows problems in the different culture phases; acclimatization is critical, in particular. Humic substances (HS) can influence plant metabolism and morphology, and have a stimulating effect on shoot and root growth, and nutrient uptake. Low molecular weight (LMW) components of HS can be particularly active. The direct and carryover effects of a LMW humic acid (HA) extracted from peat Sphagnum are investigated on in vitro rooting of shoots of pear, cv. Conference and Abbè Fetel, and on plantlet growth in the acclimatization phase. Variable HA supplements, corresponding to 0 (control), 0.5, 1 and 2 mg C l-1 were added to the rooting medium. Plantlets were acclimatized in peat at 24±2°C, 16-h photoperiod with 70 μmoles PAR m-2 s-1. Rooting was improved by HA at 0.5 and 1 mg C l-1, in particular in ‘Abbè Fetel’. Catalase (CAT) activity and malondialdehyde (MDA) content of shoots were slightly influenced by HA treatments. During acclimatization, HA at 2 mg C l-1 did not show satisfactory results. Instead, lower HA supplements increased to various degrees shoot weight and length and leaf chlorophyll content, and also enhanced nutrient uptake
In-vitro Treatments With a Low Molecular Weight Fraction of Humic Acids Can Improve Growth of Pear Plantlets During Acclimatization / Marino G.; Cellini A.; Masia A.; Simoni A.; Francioso O.; Gessa C.. - ELETTRONICO. - (2009), pp. 154-154. (Intervento presentato al convegno 11th International Symposium on Plant Bioregulators in Fruit Production tenutosi a Bologna -Italy nel September 20-23, 2009).
In-vitro Treatments With a Low Molecular Weight Fraction of Humic Acids Can Improve Growth of Pear Plantlets During Acclimatization
MARINO, GRAZIA;CELLINI, ANTONIO;MASIA, ANDREA;SIMONI, ANDREA;FRANCIOSO, ORNELLA;GESSA, CARLO EMANUELE
2009
Abstract
Pear (Pyrus communis L.) micropropagation still shows problems in the different culture phases; acclimatization is critical, in particular. Humic substances (HS) can influence plant metabolism and morphology, and have a stimulating effect on shoot and root growth, and nutrient uptake. Low molecular weight (LMW) components of HS can be particularly active. The direct and carryover effects of a LMW humic acid (HA) extracted from peat Sphagnum are investigated on in vitro rooting of shoots of pear, cv. Conference and Abbè Fetel, and on plantlet growth in the acclimatization phase. Variable HA supplements, corresponding to 0 (control), 0.5, 1 and 2 mg C l-1 were added to the rooting medium. Plantlets were acclimatized in peat at 24±2°C, 16-h photoperiod with 70 μmoles PAR m-2 s-1. Rooting was improved by HA at 0.5 and 1 mg C l-1, in particular in ‘Abbè Fetel’. Catalase (CAT) activity and malondialdehyde (MDA) content of shoots were slightly influenced by HA treatments. During acclimatization, HA at 2 mg C l-1 did not show satisfactory results. Instead, lower HA supplements increased to various degrees shoot weight and length and leaf chlorophyll content, and also enhanced nutrient uptakeI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
