Partial Root-Zone Drying and Deficit Irrigation Effect on Growth, Yield, Water Use and Quality of Greenhouse Grown Grafted Tomato

Abstract

The tomato is an important horticultural crop, the cultivation of which is often under influence of abiotic and biotic stressors. Grafting is a technique used to alleviate these problems. Shortage of water has stimulated the introduction of new irrigation methods: deficit irrigation (DI) and partial root-zone drying (PRD). This study was conducted in two spring–summer season experiments to evaluate the effects of three irrigation regimes: full irrigation (FI), PRD and DI on vegetative growth, leaf gas-exchange parameters, yield, water-use efficiency (WUE), nutrients profile and fruit quality of grafted tomatoes. In both years, the commercial rootstocks Emperador and Maxifort were used. In the first year, the scion cultivar Clarabella was grown on one stem and in the second year the cultivar Attiya was grown on two stems. Self-grafted cultivars were grown as a control. In both experiments, higher vegetative traits (leaf area and number, height, shoot biomass) were recorded in tthe plants grafted on commercial rootstocks. The stomatal conductance and transpiration rate were higher under FI. Under DI, transpiration was lowest and photosynthetic WUE was highest. Photosynthetic rate changed between irrigation treatments depending on plant type. In both years, the total yield was highest in grafted plants as result of more and bigger fruits per plant. In the 2nd year, grafted plants under FI had higher yield compared to PRD, but not to DI, while self-grafted plants did not differ between irrigation treatments. WUE was highest in DI and PRD treatments and in grafted plants. Leaf N, P, K and Ca was highest in tthe plants grafted on Emperador and Maxifort, while more Mg was measured in self-grafted plants. More Ca and Mg were recorded in tthe plants under DI and PRD. Fruit mineral concentrations were higher in tthe plants grafted on commercial rootstocks. Total soluble solids differed between irrigation regarding plant types, while fruit total acidity was higher in Emperador and Maxifort. In conclusion, our study showed that grafted plants could be grown under DI with minor yield reduction with 30–40% less water used for irrigation. Moderate DI could be used before PRD for cultivation of grafted tomato and double stemmed plants did not show negative effect on tomato yield so it can be used as standard under reduced irrigation.

Productive and physiological characteristics of tomato plants produced on different rootstocks

“…The greater net photosynthesis and carboxylation of tomato plants grafted on jiló, but without improvement in production, may be due to a greater partition of photoassimilates to other plant parts, such as the root system (Tejada‐Alvarado et al, 2022). However, grafting can improve plant photosynthesis in unfavourable environments, as reported for tomato plants under water stress (Urlić et al, 2020).…”

Impact of wild solanaceae rootstocks on morphological and physiological response, yield, and fruit quality of tomato (Solanum lycopersicum L.) grown under deficit irrigation conditions

“…Grafting is a historically validated technology that is still used in agricultural practices due to its effectiveness and usefulness in improving agronomic characteristics [ 56 ]. This technique allows the plant to perform better in morpho-physiological aspects and even overcome stress-related conditions [ 25 , [57] , [58] , [59] , [60] ], as well as potentially improve yield and fruit quality [ 59 , 61 ]. However, the procedures involve technical difficulties due to the compatibility between plants to be grafted, since a low affinity in the rootstock-scion combination can lead to slow growth and, in some cases, lower yields [ 62 ], due to vascular combinations not completing the healing/scioning process [ 57 ].…”

Grafting onto Tomato Rootstocks Improves Outcomes for Dry-farmed Tomato

“…Although grafting onto 'DRO141TX' and 'Fortamino' increased yield and reduced BER, other considerations and tradeoffs should be investigated. Grafting may also affect the dry matter, soluble solids concentration, titratable acidity, and texture, and these may affect consumer preference (Al-Harbi et al 2017;Ingram et al 2022;Turhan et al 2011;Urli c et al 2020). This is especially important because the increased intensity of flavor is cited as a reason to dry-farm tomato (Leap et al 2017).…”