Next Article in Journal
Interactive Effects of the CO2 Enrichment and Nitrogen Supply on the Biomass Accumulation, Gas Exchange Properties, and Mineral Elements Concentrations in Cucumber Plants at Different Growth Stages
Previous Article in Journal
Allelic Variation for Prolamins in Spanish Durum Wheat Landraces and its Relationship with Quality Traits
Open AccessArticle

Chlorophyll Fluorescence, Photosynthesis and Growth of Tomato Plants as Affected by Long-Term Oxygen Root Zone Deprivation and Grafting

1
Dipartimento di Agricoltura, Alimentazione e Ambiente (Di3A), University of Catania, via Valdisavoia, 5-95123 Catania, Italy
2
Dipartimento di Scienze Agrarie, Alimentari e Forestali, University of Palermo, viale delle Scienze, Ed. 4-90128 Palermo, Italy
3
Departamento de Producción Vegetal, Universitat Politècnica de València, Camino de Vera, s/n-46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(1), 137; https://doi.org/10.3390/agronomy10010137 (registering DOI)
Received: 12 December 2019 / Revised: 6 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Recent Advances in Rootstock of Vegetable Plants)
A greenhouse experiment was conducted to study the effects of the O2 root zone level and grafting on chlorophyll fluorescence, photosynthesis and growth of cherry tomato grown in a hydroponic system. Two O2 concentrations in the root zone, namely Ox (saturation level) and Ox- (2–3 mg L−1), were applied for 30 days on self-grafted cherry tomato Dreamer or grafted onto the hybrids Arnold, Beaufort, Maxifort and Top Pittam. Root hypoxia increased minimum fluorescence (by 10%) while it decreased variable fluorescence and the maximum quantum yield of PSII (up to 16 and 8%, respectively). Moreover, it reduced leaf photosynthesis, transpiration and stomatal conductance (by 12, 17 and 13%, respectively), whereas it increased leaf electrolyte leakage (by 2.1%). The graft combinations showed a different ability in buffering the effects of root hypoxia on plant growth and related components, and these differences were related to their root biomass. The minimum fluorescence was negatively correlated to plant growth, so it may be a useful indicator to select tolerant rootstocks to root hypoxia. Our results suggest the occurrence of both diffusive and metabolic constraints to tomato photosynthesis under root hypoxia, a condition that can be mitigated by selecting rootstocks with a more developed root system. View Full-Text
Keywords: tomato; rootstock; oxygen starvation; chlorophyll fluorescence; photosynthesis; stomatal conductance tomato; rootstock; oxygen starvation; chlorophyll fluorescence; photosynthesis; stomatal conductance
Show Figures

Figure 1

MDPI and ACS Style

Mauro, R.P.; Agnello, M.; Distefano, M.; Sabatino, L.; San Bautista Primo, A.; Leonardi, C.; Giuffrida, F. Chlorophyll Fluorescence, Photosynthesis and Growth of Tomato Plants as Affected by Long-Term Oxygen Root Zone Deprivation and Grafting. Agronomy 2020, 10, 137.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop