Lamlom Sobhi F, Abdelghany Ahmed M, Farouk A S, Alwakel E Sh, Makled Khaled M, Bukhari Najat A, Hatamleh Ashraf Atef, Ren Honglei, El-Sorady Gawhara A, Shehab A A
Plant Production Department, Faculty of Agriculture Saba Basha, Alexandria University, Alexandria, 21531, Egypt.
Crop Science Department, Faculty of Agriculture, Damanhour University, Damanhour, Egypt.
BMC Plant Biol. 2025 Jan 2;25(1):5. doi: 10.1186/s12870-024-05879-8.
Drought stress significantly impacts wheat productivity, but plant growth regulators may help mitigate these effects. This study examined the influence of gibberellic acid (GA3) and abscisic acid (ABA) on wheat (Triticum aestivum L., CV: Giza 171) growth and yield under different water regimes. Using a split-plot design, we tested three drought levels as main plots: normal irrigation (80% field capacity), moderate drought (60% field capacity), and severe drought (40% field capacity). Subplots consisted of GA3 and ABA treatments at 100 and 200 ppm concentrations. Results showed that 200 ppm GA3 treatment enhanced multiple growth parameters under normal irrigation, including plant height (25-30% increase), leaf area (30-35% increase), and reproductive traits (40% increase in number of number of spikes, 35% increase in grains per spike). In contrast, ABA treatment at 200 ppm resulted in reduced plant height (35% decrease) and greater leaf area reduction (40% vs. 20% in control) under drought conditions. GA3 at 200 ppm also improved physiological parameters including catalase and superoxide dismutase activities, protein content, and proline accumulation. These findings demonstrate the distinct roles of GA3 and ABA in regulating wheat growth and stress responses, providing valuable insights for drought management in wheat cultivation.
干旱胁迫显著影响小麦产量，但植物生长调节剂可能有助于减轻这些影响。本研究考察了赤霉素（GA3）和脱落酸（ABA）在不同水分条件下对小麦（Triticum aestivum L.，品种：吉萨171）生长和产量的影响。采用裂区设计，我们将三种干旱水平作为主区进行测试：正常灌溉（田间持水量的80%）、中度干旱（田间持水量的60%）和重度干旱（田间持水量的40%）。副区由浓度为100 ppm和200 ppm的GA3和ABA处理组成。结果表明，在正常灌溉条件下，200 ppm GA3处理提高了多个生长参数，包括株高（增加25 - 30%）、叶面积（增加30 - 35%）和生殖性状（穗数增加40%，每穗粒数增加35%）。相比之下，在干旱条件下，200 ppm ABA处理导致株高降低（降低35%），叶面积减少幅度更大（对照为20%，处理为40%）。200 ppm的GA3还改善了生理参数，包括过氧化氢酶和超氧化物歧化酶活性、蛋白质含量和脯氨酸积累。这些发现证明了GA3和ABA在调节小麦生长和胁迫反应中的不同作用，为小麦栽培中的干旱管理提供了有价值的见解。
