APPLICATION OF BIOSYNTHESIZED NANOPARTICLES IN THE ENHANCEMENT OF GROWTH AND YIELD PERFORMANCES OF RICE (ORYZA SATIVA VAR. NERICA) UNDER SALINITY CONDITIONS IN A FERRUGINOUS ULTISO (original) (raw)
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Bulletin of the National Research Centre
Background Rice (Oryza sativa L.) is a common staple food in Nigeria. However, cultivation is impaired by heavy metal contamination, particularly iron (Fe). This study aimed to investigate the impacts of biosynthesized nanoparticles (NPs) in enhancing the growth and yield components of rice sown in ferruginous soil. Viable seeds of O. sativa var. nerica were sown in ferruginous and non-ferruginous soils. After four weeks, the plants were exposed to foliar sprays of biosynthesized NPs from silver nitrate, using extracts of leaves of Carica papaya, Vernonia amygdalina, Moringa oleifera, and Azadirachta indica; and the flowers of Hibiscus sabderiffa, following standard procedure. The originally prepared stock solution was diluted to give 5, 15, and 30% concentrations of each synthesized NP. Results Results showed that soil ferrugenicity impeded the growth and yield of rice. Azadirachta-synthesized NPs was better enhanced in the ferruginous soils, which might be due to Fe interaction an...
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Journal of the Patuakhali Science and Technology University, 2022
Rice is considered a crop sensitive to salinity and increasing soil salinity is a global threat that restricting rice production. After being exposed to salinity stress (10 dSm-1 induced by NaCl) for seven days the seedlings were foliar sprayed with four combinations of abscisic acid (ABA) and silicon (Si) {50 µM ABA; 03 mM CaSiO 4 as Si source, co-application of ABA (50 µM) and Si (03 mM CaSiO 4), and tube-well water as control}. Salinity affected almost all the morpho-physiological parameters like shoot and root length, fresh weight of shoot and relative water content (RWC), K + /Na + in leaves and roots of rice. In response to four combinations of ABA and Si treatment, three treatments namely, ABA, Si, and co-application of ABA and Si had significant salt stress mitigating effects on the growth and physiology of both salt tolerant (BRRI dhan41) and sensitive (BRRI dhan49) rice seedlings. Specifically, while considering the shoot and root length, fresh and dry weight of shoot and root, RWC and K + /Na + , the salt sensitive BRRI dhan49 under salt stress showed similar morpho-physiological indices as compared with those in the case of salt tolerant BRRI dhan41. Percent leaf RWC (an important index of stress responsiveness) in BRRI dhan49 under salt stress after foliar application of ABA and Si was recorded as the highest (88.88%), which is statistically similar with those in the case of both BRRI dhan41 and BRRI dhan49 under non-saline condition. Besides, we observed that co-application of ABA and Si significantly improved K + /Na + in the leaves of salt-sensitive BRRI dhan49 under salinity, which might also play crucial role in mitigating salt stress in BRRI dhan49. Thus, foliar spraying of ABA and Si, especially on the salt sensitive high yielding rice genotypes could be an effective strategy to counterbalance salinity induce negative impacts on rice.
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International Journal of Biosciences (IJB)
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