http://www.cnr.it/ontology/cnr/individuo/prodotto/ID10765
Water relations, photosynthesis, growth and water-use efficiency in tomato plants subjected to partial (Articolo in rivista)
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- Water relations, photosynthesis, growth and water-use efficiency in tomato plants subjected to partial (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Alternative label
Tahi, H (Tahi, H.); Wahbi, S (Wahbi, S.); Wakrim, R (Wakrim, R.); Aganchich, B (Aganchich, B.); (2007)
Water relations, photosynthesis, growth and water-use efficiency in tomato plants subjected to partial
in Plant Biosystems (Firenze, Testo stamp.)
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- Tahi, H (Tahi, H.); Wahbi, S (Wahbi, S.); Wakrim, R (Wakrim, R.); Aganchich, B (Aganchich, B.); (literal)
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- Titolo
- Water relations, photosynthesis, growth and water-use efficiency in tomato plants subjected to partial (literal)
- Abstract
- Partial rootzone drying (PRD) and regulated deficit irrigation (RDI) are water-saving irrigation systems
that have been developed to increase water-use efficiency (WUE) without significant yield reduction. In order to
investigate whether a high-value horticultural crop such as tomato responded differently to RDI and PRD, we
compared the physiological and growth responses of tomato plants using a split-root system. Plants were grown in agreenhouse under controlled conditions with their roots separated equally between two soil compartments. Three
irrigation treatments were imposed: (i) Control, receiving an amount of water equivalent to 100% of plant
transpiration;,(ii) PRD, in which one compartment was watered with 50% of the amount of water supplied to the
controls, allowing one-half of the root system to be exposed to dry soil and switching irrigation between sides
weekly; and (iii) RDI, in which 50% of the amount of water given to the controls was supplied, half to each side of
the root system. Leaf RWC and midday leaf psi decreased substantially in RDI-treated plants, while the PRD plants
exhibited relatively higher psi and RWC values. Both PRD and RDI treatments reduced by about 30% the total plant
dry mass compared with the control. However, plant transpiration was reduced by about 50% in both PRD and RDI,
allowing a significant improvement in whole-plant WUE. Stomatal conductance (Gs) and leaf growth were also
significantly reduced by PRD and RDI. These results may be related to a significant increase in xylem sap pH and
leaf apoplastic pH. Generally, the photosynthetic apparatus of tomato leaves had a high resistance to restricted water
availability. In fact, the decreased Gs had no major negative impact on carbon assimilation. However, V-cmax, i.e.
Rubisco efficiency, was significantly decreased in RDI plants with respect to control ones. This may imply that,
although the differences between the PRD and RDI treatments in our study were subtle, they may become more
marked with a more prolonged and severe water deficit.
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