habrochaites has been the most commonly used combination in developing commercial interspecific hybrid rootstocks. Furthermore, these hybrid rootstocks and their derivatives are grafted to F 1 hybrid scions to create a grafted plant with different interacting genomes. pennellii and even others, are tolerant to various abiotic stresses, including drought. The selection and development of the line or heterotic F 1 hybrid has been a successful approach for developing rootstocks to address the issues related to using wild species, such as a rootstock that retains beneficial traits in the tomato. Since it is the entry point for water, the root’s intrinsic structure and functions play a crucial role in maintaining soil-water-plant balance during moisture deficit at the rhizosphere. The roots acquire water and nutrients for optimal growth and the development of plants moreover, they anchor plants in the ground. The early growth stage of the tomato is sensitive to drought as it coincides with the establishment of roots in the rhizosphere. Hence, it is imperative to develop strategies to mitigate the adverse effects of drought on tomato through improvement of the plant’s capacity to utilise the moisture in the growth media based on access to water and sensitivity of growth stages of plants. The water shortage during the drought period has significant implications on the production, leading to a 50% loss in tomatoes. Especially in water scarce arid and semi-arid regions, the impact of drought on sensitive vegetable crops becomes aggravated due to less productive soil. As a crop dependent on an assured water supply, it is often vulnerable to water scarcity arising from drought, which is one of the abiotic stresses threatening global food and nutritional security. Tomato is one of the most sought vegetable crops due to its high nutritive value and multiple uses worldwide. Overall, we demonstrated the efficient use of a phenomics platform and developed a protocol to identify promising rootstock–scion combinations of tomato for optimization of water use. pennellii), and hence efficient water uptake. The distinct response of interspecific rootstock, RF4A, to water stress can be ascribed to the effective root system acquired from a wild parent ( S. These plants could maintain a higher level of PSII efficiency, signifying better photosynthetic efficiency even under water stress. The RF4A rootstock-grafted plants were more conservative in water use with higher plant water status through relatively better stomatal regulation and hence were more efficient in generating greater biomass under water stress conditions. pennellii) derivative RF4A was highly efficient in terms of productive use of water. Among the rootstocks, an interspecific ( Solanum lycopersicum × S. Rootstocks included tomato cultivars and the hybrids, derived from the crosses involving wild relatives, as donor parents. In this study, we used a high throughput phenomics facility to assess the efficiency of tomato, grafted on the rootstocks of different genetic backgrounds, at different levels of moisture in the soil. However, the success in developing the best graft combination of cultivated tomato and rootstock depends on the source of rootstock and selection methods. Grafting offers a great opportunity to replace the root system of the cultivated tomato plants with that of wild species and hence provide a rapid solution to modulate root system architecture in contrast to the time-consuming conventional breeding approach. Since the root is the entry point for water, its intrinsic structure and functions play a crucial role in maintaining the soil–water–plant continuum during moisture deficit at the rhizosphere. Hence, it is imperative to devise strategies to mitigate the adverse effects of drought on tomato through improvement in the plant’s efficiency to utilise the moisture in the growth medium. The magnitude and intensity of drought is predicted to intensify under climate change scenarios, particularly in semi-arid regions, where water is already a scarce resource. The cultivation of nutritionally and economically important crops like tomato are often threatened by dry spells due to drought as these crops largely depend on an assured water supply.
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