Exploring the pivotal impact of salt stress on survival and morphological characteristics of citrus (Citrus spp.) rootstocks
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Keywords:
Citrus rootstock, abiotic stress, salinity, citrus morphology, survivabilityAbstract
In the Bundelkhand region, salinity presents a significant challenge for citrus plant growth. A study was carried out at Banda University of Agriculture and Technology during the 2023–24 academic year to assess seven citrus rootstocks namely, Rangpur lime, Cleopatra mandarin, Rough lemon, Sour orange, NRCC RS-3, NRCC RS-4, and NRCC RS-6 under varying salinity stress levels viz., control (0.07 dS/m), 2.0 dS/m, 4.0 dS/m, and 8.0 dS/m. These levels of salinity negatively impacted all growth parameters of the plants across all rootstocks when compared to the control treatment (0.07 dS/m). Specifically, plant mortality increased, and there were reductions in plant height, stem diameter, number of leaves, number of shoots, leaf area and root length. The minimum mortality percentage at 8dS/m over control was observed in Rangpur lime, followed by Cleopatra mandarin and Sour orange. The reduction percentage in plant height, stem diameter, number of leaves, and number of shoots at 8 dS/m salinity level over the control was also noted in Rangpur lime. While the minimum reduction in leaf area (13.50%) and root length (24.71%) was recorded in Cleopatra mandarin at the salinity level of 8 dS/m over the control. Rangpur lime, Sour orange, and Cleopatra mandarin showed better salinity tolerance, while Rough lemon, NRCC RS-3, and NRCC RS-6 had a moderate response. NRCC RS-4 was less tolerant, showing reduced growth at 8 dS/m compared to the control.
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