PDF(Pubmed)
Abstract：
The deleterious impact of osmotic stress, induced by water deficit in arid and semi-arid regions, poses a formidable challenge to cotton production. To protect cotton farming in dry areas, it\'s crucial to create strong plans to increase soil water and reduce stress on plants. The carboxymethyl cellulose (CMC), gibberellic acid (GA3) and biochar (BC) are individually found effective in mitigating osmotic stress. However, combine effect of CMC and GA3 with biochar on drought mitigation is still not studied in depth. The present study was carried out using a combination of GA3 and CMC with BC as amendments on cotton plants subjected to osmotic stress levels of 70 (70 OS) and 40 (40 OS). There were five treatment groups, namely: control (0% CMC-BC and 0% GA3-BC), 0.4%CMC-BC, 0.4%GA3-BC, 0.8%CMC-BC, and 0.8%GA3-BC. Each treatment was replicated five times with a completely randomized design (CRD). The results revealed that 0.8 GA3-BC led to increase in cotton shoot fresh weight (99.95%), shoot dry weight (95.70%), root fresh weight (73.13%), and root dry weight (95.74%) compared to the control group under osmotic stress. There was a significant enhancement in cotton chlorophyll a (23.77%), chlorophyll b (70.44%), and total chlorophyll (35.44%), the photosynthetic rate (90.77%), transpiration rate (174.44%), and internal CO2 concentration (57.99%) compared to the control group under the 40 OS stress. Thus 0.8GA3-BC can be potential amendment for reducing osmotic stress in cotton cultivation, enhancing agricultural resilience and productivity.
摘要：
渗透胁迫的有害影响，干旱和半干旱地区的水分亏缺，对棉花生产构成了巨大的挑战。为了保护干旱地区的棉花种植，制定强有力的计划来增加土壤水分和减少对植物的压力是至关重要的。羧甲基纤维素(CMC),发现赤霉素（GA3）和生物炭（BC）分别有效缓解渗透胁迫。然而,CMC和GA3与生物炭的联合缓解干旱的作用仍未深入研究。本研究是使用GA3和CMC与BC的组合作为对遭受渗透胁迫水平为70（70OS）和40（40OS）的棉花植物的改良。有五个治疗组，即：对照（0%CMC-BC和0%GA3-BC），0.4%CMC-BC，0.4%GA3-BC，0.8%CMC-BC，和0.8%GA3-BC。用完全随机设计(CRD)将每种治疗重复五次。结果表明，0.8GA3-BC导致棉花芽鲜重增加（99.95％），芽干重（95.70%），根鲜重（73.13%），与渗透胁迫下的对照组相比，根干重（95.74％）。棉花叶绿素a显著增强(23.77%),叶绿素b（70.44%），和总叶绿素(35.44%)，光合速率(90.77%)，蒸腾速率(174.44%)，和内部CO2浓度(57.99%)相比对照组在40OS胁迫下。因此，0.8GA3-BC可能是减少棉花种植中渗透胁迫的潜在改良剂，提高农业韧性和生产力。
