Growth and gas exchange response to water shortage of a maize crop on different soil types |
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Authors: | Luca Vitale Paul Di Tommasi Carmen Arena Michele Riondino Annachiara Forte Angelo Verlotta Angelo Fierro Amalia Virzo De Santo Amodio Fuggi Vincenzo Magliulo |
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Affiliation: | (1) CNR-ISAFoM, Istituto per i Sistemi Agricoli e Forestali del Mediterraneo, via Cupa Patacca, 85-80056 Ercolano, NA, Italy;(2) Dipartimento di Biologia Strutturale e Funzionale, Università degli Studi di Napoli Federico II, via Cinthia, 80126 Naples, Italy;(3) Dipartimento di Scienze della Vita, Seconda Università degli Studi di Napoli, via Vivaldi 43, 81100 Caserta, Italy |
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Abstract: | The effect of water shortage on growth and gas exchange of maize grown on sandy soil (SS) and clay soil was studied. The lower soil water content in the SS during vegetative growth stages did not affect plant height, above-ground biomass, and leaf area index (LAI). LAI reduction was observed on the SS during the reproductive stage due to early leaf senescence. Canopy and leaf gas exchanges, measured by eddy correlation technique and by a portable photosynthetic system, respectively, were affected by water stress and a greater reduction in net photosynthetic rate (A N) and stomatal conductance (g s) was observed on SS. Chlorophyll and carotenoids content was not affected by water shortage in either condition. Results support two main conclusions: (1) leaf photosynthetic capacity was unaffected by water stress, and (2) maize effectively endured water shortage during the vegetative growth stage. |
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Keywords: | Growth Net ecosystem exchange Net photosynthetic rate Zea mays L. Water stress |
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