Physio-biochemical adaptations of wheat landraces may have great importance in their growth, survival and yield under drought stress. Here, we evaluated the effects of drought stress on some defense systems of wheat cultivar “Sistan” (drought-sensitive) and landrace “Bolani” (drought-tolerant). Under drought stress, Bolani plants showed lower increases in hydrogen peroxide content compared to Sistan ones, which was accompanied with significant decrease in malondialdehyde and electrolyte leakage indices. Increasing the transcript levels and activity of enzymatic and non-enzymatic antioxidants along with phenylpropanoid metabolites improved relative tolerance to drought-induced oxidative stress, particularly in Bolani plants, results which may be confirmed by a significant decrease in the damage indices. In the phenylpropanoid pathway, the biosynthetic pathway of total phenol, flavonoids and anthocyanins was more active than lignin-biosynthetic pathway, which could early respond to drought stress. These results may be confirmed by their negative significant correlations with damage indices as well as a non-significant correlation of lignin with most enzymatic and non-enzymatic antioxidants in plants. Lower decrease of chlorophyll (Chl) and carotenoid contents in Bolani plants compared to Sistan ones indicated the relative stability of photosynthetic pigments under drought stress. Our results suggested that integrating metabolic pathways could coordinately alleviate oxidative stress that can lead to introducing suitable genetic sources for drought tolerance.

小麦地方品种的生理生化适应可能在干旱胁迫下对其生长，存活和产量具有重要意义。在这里，我们评估了干旱胁迫对小麦品种“ Sistan”（对干旱敏感）和地方品种“ Bolani”（对干旱耐受）的防御系统的影响。在干旱胁迫下，Bolani植物的过氧化氢含量增加量低于Sistan植物，同时丙二醛和电解质渗漏指数显着降低。酶促和非酶促抗氧化剂以及苯丙烷类代谢物的转录水平和活性的提高，提高了对干旱诱导的氧化胁迫的相对耐受性，尤其是在Bolani植物中，其结果可通过损害指数的显着降低得到证实。在苯丙烷途径中，总酚，类黄酮和花色苷的生物合成途径比木质素生物合成途径更为活跃，可以早期响应干旱胁迫。这些结果可以通过它们与损害指数的负显着相关以及木质素与植物中大多数酶和非酶抗氧化剂的非显着相关性来证实。与Sistan植物相比，Bolani植物中叶绿素（Chl）和类胡萝卜素含量的降低较低，这表明干旱胁迫下光合色素的相对稳定性。我们的研究结果表明，整合代谢途径可以协调缓解氧化应激，从而可以引入合适的遗传资源来耐受干旱。可以及早应对干旱压力。这些结果可以通过其与破坏指数的负显着相关以及木质素与植物中大多数酶和非酶抗氧化剂的非显着相关性来证实。与Sistan植物相比，Bolani植物中叶绿素（Chl）和类胡萝卜素含量的降低较低，这表明干旱胁迫下光合色素的相对稳定性。我们的研究结果表明，整合代谢途径可以协调缓解氧化应激，从而可以引入合适的遗传资源来耐受干旱。可以及早应对干旱压力。这些结果可以通过它们与损害指数的负显着相关以及木质素与植物中大多数酶和非酶抗氧化剂的非显着相关性来证实。与Sistan植物相比，Bolani植物中叶绿素（Chl）和类胡萝卜素含量的降低较低，这表明干旱胁迫下光合色素的相对稳定性。我们的研究结果表明，整合代谢途径可以协调缓解氧化应激，从而可以引入合适的遗传资源来耐受干旱。与Sistan植物相比，Bolani植物中叶绿素（Chl）和类胡萝卜素含量的降低较低，这表明干旱胁迫下光合色素的相对稳定性。我们的研究结果表明，整合代谢途径可以协调缓解氧化应激，从而可以引入合适的遗传资源来耐受干旱。与Sistan植物相比，Bolani植物中叶绿素（Chl）和类胡萝卜素含量的降低幅度较小，这表明干旱胁迫下光合色素的相对稳定性。我们的研究结果表明，整合代谢途径可以协调缓解氧化应激，从而可以引入合适的遗传资源来耐受干旱。