Browsing by Author "Shabbir, Rubab"

Now showing 1 - 3 of 3
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    Calcium homeostasis and potential roles to combat environmental stresses in plants
    (Elsevier B.V., 2022) Shabbir, Rubab; Javed, Talha; Hussain, Sadam; Ahmar, Sunny; Naz, Misbah; Zafar, Hina; Pandey, Saurabh; Chauhan, Jyoti; Siddiqui, Manzer H.; Pinghua, Chen
    The calcium (Ca+2) molecules being an important intracellular messenger are involved in various signal transduction mechanisms in plants. Many external stimuli such as drought, cold, heat stress, metalloid stress (copper (Cu), cadmium (Cd), nickel (Ni), and arsenic), flooding, and salinity stress increase the free Ca+2 ions in the cytosol. The H+/Ca+2 antiporters and Ca+2-ATPases actively transport the cytosolic Ca+2 in intracellular organelles or apoplasts. Increase in Ca+2 concentration is sensed by calcium-binding proteins or Ca+2-sensors which lead to activation of CDPKs (Calcium-dependent protein kinases). These CDPKs regulate various genes responsive to stress to show phenotypic responses against stress stimuli. Hormonal signaling and their crosstalk with Ca+2 have been studied extensively but a thorough understanding of Ca+2 in stress tolerance is limited. This review describes the various aspects of Ca+2 involvement in sensing stress stimuli, signal transduction, role against various stress factors (including temperature extreme, salinity, flooding, metalloids, and drought), the role of Ca+2 in the regulation of physiological processes, and Ca+2-ATPase. � 2022 SAAB
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    Combined Abiotic Stresses: Challenges and Potential for Crop Improvement
    (MDPI, 2022) Shabbir, Rubab; Singhal, Rajesh Kumar; Mishra, Udit Nandan; Chauhan, Jyoti; Javed, Talha; Hussain, Sadam; Kumar, Sachin; Anuragi, Hirdayesh; Lal, Dalpat; Chen, Pinghua
    Abiotic stressors are major constraints that affect agricultural plant physio-morphological and biochemical attributes, resulting in a loss of normal functioning and, eventually, a severe decline in crop productivity. The co-occurrence of different abiotic stresses, rather than a specific stress situation, can alter or trigger a wide range of plant responses, such as altered metabolism, stunted growth, and restricted development. Therefore, systematic and rigorous studies are pivotal for understanding the impact of concurrent abiotic stress conditions on crop productivity. In doing so, this review emphasizes the implications and potential mechanisms for controlling/managing combined abiotic stresses, which can then be utilized to identify genotypes with combined stress tolerance. Furthermore, this review focuses on recent biotechnological approaches in deciphering combined stress tolerance in plants. As a result, agronomists, breeders, molecular biologists, and field pathologists will benefit from this literature in assessing the impact of interactions between combined abiotic stresses on crop performance and development of tolerant/resistant cultivars. � 2022 by the authors.
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    Seed priming with Mg(NO3)2 and ZnSO4 salts triggers the germination and growth attributes synergistically in wheat varieties
    (MDPI, 2021) Choudhary, Surendra Kumar; Kumar, Vivek; Singhal, Rajesh Kumar; Bose, Bandana; Chauhan, Jyoti; Alamri, Saud; Siddiqui, Manzer H.; Javed, Talha; Shabbir, Rubab; Rajendran, Karthika; Iqbal, Muhammad Aamir; Elmetwaly, Zahia E.A.; Sorour, Sobhy; Sabagh, Ayman E. L.
    An experiment was conducted in both laboratory (germinative attributes) and field conditions (growth attributes) with completely randomized design (CRD) and randomized block design, respectively, to view the responses of different priming treatments in two wheat varieties: HUW-234 (V1) and BHU-3(V2). In the present study, seeds were primed with water (hydro; T2), Mg (NO3)2 (T3), ZnSO4 (T4), and a combination of both salts (T5). Their carry over effects were observed on the germinative and vegetative phases of growth. All treatments were compared with the performance of nonprimed control seeds (T1). Maximum germination percentage (98.33, 100%) was noted with T3, whereas length of shoot (8.83, 10.23 cm) and root (9.47, 10.73 cm) and their fresh (0.34, 0.45 g) and dry weights (0.05, 0.07 g) were recorded maximum in T5 for both varieties; however, the vigor index I and II showed varietal difference, but primed sets were found always superior with respect to nonprimed control. Study of plant height, leaf number and area, fresh and dry weights of total leaves and stem showed the best performance under combined use of both salts, i.e., Mg (NO3)2 and ZnSO4 as priming agents, followed by ZnSO4, Mg (NO3)2, hydro, and the nonprimed one. The study of biochemical parameters such as protein content and nitrate reductase activity of leaves showed the highest increment in combined priming treatment and increased 63.77, 90.37, 37.44% and 12.81, 5.61, 7.75%, respectively, after 35, 45, and 60 days after sowing. It is likely that chlorophyll, nitrogen, iron, and zinc content also followed a similar pattern and were enhanced in combined priming treatments as compared to nonpriming treatment. Therefore, the result suggests that priming seeds with Mg (NO3)2 and ZnSO4 worked synergistically at varietal level and improved growth attributes at field conditions. � 2021 by the authors. Licensee MDPI, Basel, Switzerland.