Ullah Muhammad Saad, Mahmood Athar, Alawadi Hussam F Najeeb, Seleiman Mahmoud F, Khan Bilal Ahmad, Javaid Muhammad Mansoor, Wahid Abdul, Abdullah Fnu, Wasonga Daniel O
Department of Botany, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan.
Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, 38000, Pakistan.
BMC Plant Biol. 2025 Jan 2;25(1):3. doi: 10.1186/s12870-024-06013-4.
This study explored how exogenous silicon (Si) affects growth and salt resistance in maize.
The maize was cultivated in sand-filled pots, incorporating varied silicon and salt stress (NaCl) treatments. Silicon was applied at 0, 2, 4, 6, and 8 mM, and salt stress was induced using 0, 60 and120 mM concentrations. Soil salinity triggers a range of physiochemical abnormalities, often leading to growth arrest and, eventually, the demise of susceptible plants.
The salt stress significantly reduced the total chlorophyll content (12.58-33.14%), antioxidant enzymes, notably SOD (32-46%), POD (10.33-18.48%), and CAT (10.05-13.19%). In contrast, salt stress increased secondary metabolites, including total phenols (49.11-66.35%.), flavonoids (220.99-280.36%), and anthocyanin (50.04-58.6%). Adding silicon under salt stress reduced the absorption of Na by 6.69%, 20.7%, 41.12%, and 34.28%, respectively, compared to their respective controls. Additionally, applying Si at 8 mM significantly enhanced antioxidant enzymes such as SOD (50.57%), POD (15.58%), CAT (10.06%) and chlorophyll ratio (21.32%).
Silicon application positively impacted nearly all growth and physiological features, indicating it helps mitigate against salinity. This was achieved by regulating various salinity indicators, where secondary metabolites, including anthocyanin, ascorbic acid, total phenols, and flavonoids, increased.
本研究探讨了外源硅（Si）如何影响玉米的生长和耐盐性。
将玉米种植在装满沙子的花盆中，采用不同的硅和盐胁迫（NaCl）处理。硅的施用量分别为0、2、4、6和8 mM，盐胁迫采用0、60和120 mM浓度诱导。土壤盐渍化会引发一系列理化异常，常常导致生长停滞，最终使易感植物死亡。
盐胁迫显著降低了总叶绿素含量（12.58 - 33.14%）、抗氧化酶，尤其是超氧化物歧化酶（SOD，32 - 46%）、过氧化物酶（POD，10.33 - 18.48%）和过氧化氢酶（CAT，10.05 - 13.19%）。相比之下，盐胁迫增加了次生代谢产物，包括总酚（49.11 - 66.35%）、黄酮类化合物（220.99 - 280.36%）和花青素（50.04 - 58.6%）。与各自的对照相比，在盐胁迫下添加硅分别使Na的吸收减少了6.69%、20.7%、41.12%和34.28%。此外，施用8 mM的硅显著提高了抗氧化酶如SOD（50.57%）、POD（15.58%）、CAT（10.06%）和叶绿素比例（21.32%）。
施用硅对几乎所有生长和生理特征都有积极影响，表明它有助于缓解盐度胁迫。这是通过调节各种盐度指标实现的，其中包括花青素、抗坏血酸、总酚和黄酮类化合物在内的次生代谢产物增加。
