Young micropropagated pineapple plants show a high plasticity of crassulace an acid metabolism in response to soil short-term drying and rewetting.

DR. JUSTO LORENZO GONZALEZ OLMEDO; DR. CARLOS ARAGON; MSC. RENE CARLOS RODRIGUEZ ESCRIBA; DRA. MARITZA ESCALONA MORGADO; MSC. LUCIA SANDRA PEREZ BORROTO; DR. ROMELIO RODRÍGUEZ; MSC. GUSTAVO YASER LORENTE

ACTA PHYSIOLOGIAE PLANTARUM

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2018

0137-5881

In Cuba, micropropagation plays an important role in the agricultural extension of pineapple plants ´MD-2´, however there are problems with the transition from plants to the field. One possibility of its preparation is the modulation of its metabolism with the induction of defensive mechanisms in the face of water deficit. In this work we evaluated morphological and biochemical changes in plants grown for 30 days in two water regimes (plants with irrigation (CR) and without irrigation (SR)), after 30 days it was irrigated until the saturation of the substrate during 15 days . All determinations were made on sheet "D" every 15 days, gas exchange, organic acid levels, fresh and dry mass were quantified every 3 hours for 24 hours. At 15:00 h the chlorophyll content and superoxide dismutase (SOD) activity (EC 1.15.1.1) was determined, and the water content, decarboxylation rate and succulence index (SI) were calculated. After 15 days the SR plants had the best response for their transfer to the field, with an increase in leaf width "D", a higher proportion of CO2 uptake at night, higher levels of organic acids, decarboxylation rate, IS and SOD activity, in addition to the decrease in the total chlorophyll content which showed an increase in the magnitude of CAM expression. After 30 days, a severe water deficit was observed in the SR plants but a rapid recovery with the establishment of irrigation demonstrating a high metabolic flexibility.