Ullah Sami, Khan Muhammad Ishaq, Khan Muhammad Nauman, Ali Usman, Ali Baber, Iqbal Rashid, Z Gaafar Abdel-Rhman, AlMunqedhi Bandar M, Razak Sarah Abdul, Kaplan Alevcan, Ercisli Sezai, Soudy Fathia A
Department of Botany, University of Peshawar, Peshawar 25120, Pakistan.
Department of Botany, Bacha Khan University Charsadda, Charsadda 24420, Pakistan.
ACS Omega. 2023 May 29;8(23):20488-20504. doi: 10.1021/acsomega.3c00753. eCollection 2023 Jun 13.
The threat of varying global climates has greatly driven the attention of scientists, as climate change increases the odds of worsening drought in many parts of Pakistan and the world in the decades ahead. Keeping in view the forthcoming climate change, the present study aimed to evaluate the influence of varying levels of induced drought stress on the physiological mechanism of drought resistance in selected maize cultivars. The sandy loam rhizospheric soil with moisture content 0.43-0.5 g g, organic matter (OM) 0.43-0.55 g/kg, N 0.022-0.027 g/kg, P 0.028-0.058 g/kg, and K 0.017-0.042 g/kg was used in the present experiment. The findings showed that a significant drop in the leaf water status, chlorophyll content, and carotenoid content was linked to an increase in sugar, proline, and antioxidant enzyme accumulation at < 0.05 under induced drought stress, along with an increase in protein content as a dominant response for both cultivars. SVI-I & II, RSR, LAI, LAR, TB, CA, CB, CC, peroxidase (POD), and superoxide dismutase (SOD) content under drought stress were studied for variance analysis in terms of interactions between drought and NAA treatment and were found significant at < 0.05 after 15 days. It has been found that the exogenous application of NAA alleviated the inhibitory effect of only short-term water stress, but yield loss due to long-term osmotic stress will not be faced employing growth regulators. Climate-smart agriculture is the only approach to reduce the detrimental impact of global fluctuations, such as drought stress, on crop adaptability before they have a significant influence on world crop production.
全球气候变化的威胁极大地引起了科学家的关注，因为气候变化增加了未来几十年巴基斯坦及世界许多地区干旱加剧的可能性。考虑到即将到来的气候变化，本研究旨在评估不同程度的诱导干旱胁迫对所选玉米品种抗旱生理机制的影响。本试验采用砂壤土根际土壤，其含水量为0.43 - 0.5 g/g，有机质（OM）为0.43 - 0.55 g/kg，氮为0.022 - 0.027 g/kg，磷为0.028 - 0.058 g/kg，钾为0.017 - 0.042 g/kg。研究结果表明，在诱导干旱胁迫下，当<0.05时，叶片水分状况、叶绿素含量和类胡萝卜素含量显著下降，同时糖、脯氨酸和抗氧化酶积累增加，两个品种的蛋白质含量均显著增加，这是主要响应。对干旱胁迫下的SVI - I和II、RSR、LAI、LAR、TB、CA、CB、CC、过氧化物酶（POD）和超氧化物歧化酶（SOD）含量进行了干旱与NAA处理相互作用的方差分析，发现15天后在<0.05水平上具有显著性。研究发现，外源施用NAA仅能缓解短期水分胁迫的抑制作用，但使用生长调节剂不会面临长期渗透胁迫导致的产量损失。气候智能型农业是在全球波动（如干旱胁迫）对世界作物生产产生重大影响之前，减少其对作物适应性不利影响的唯一途径。
