ABSTRACT

Soil salinity is a global problem, which is predicted to worsen in arid and semi-arid regions due to climate change. The aim of this study was to understand the remediation potential of biochar in alleviating salt stress by studying its effects on the growth and physiological parameters of the tomato (Solanum lycopersicum). A completely randomized design (CRD) was used where three different biochar doses (0%, 5% (v/v), and 10% (v/v)) were applied to the soil under saline (100 M) and non-saline conditions. Our results showed that while salt stress affected the plant growth negatively at all biochar doses, 5% and 10% biochar applications improved the overall plant performance under saline conditions. For the samples with salt stress, plant height and leaf area were increased by 43.1% and 45.3%, respectively, and physiological parameters, such as leaf relative water content and chlorophyll-a content, increased when 5% biochar was used. On the other hand, the highest increase rates in shoot fresh weight (113.7%), shoot dry weight (74.8%), the number of leaves (24.9%), root fresh weight (115.5%), root dry weight (62.5%) were obtained from 10% biochar amendment under saline conditions. Moreover, biochar amendment at both doses significantly decreased the superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities, as well as malondialdehyde (MDA) and proline contents, which resulted in an improved plant growth due to the reduction of the oxidative and osmotic stresses. In conclusion, biochar amendment might be a promising approach to mitigate the adverse effects of salinity stress on tomato seedlings

摘要

土壤盐分是一个全球性问题，预计由于气候变化，干旱和半干旱地区的土壤盐分会恶化。本研究的目的是通过研究生物炭对番茄（Solanum lycopersicum）生长和生理参数的影响，了解生物炭在缓解盐胁迫方面的修复潜力。）。使用完全随机设计 (CRD)，其中将三种不同的生物炭剂量（0%、5% (v/v) 和 10% (v/v)）应用于盐分 (100 M) 和非盐分下的土壤状况。我们的结果表明，虽然盐胁迫在所有生物炭剂量下都对植物生长产生负面影响，但 5% 和 10% 的生物炭应用提高了盐分条件下植物的整体性能。对于盐胁迫的样品，当使用5%的生物炭时，株高和叶面积分别增加了43.1%和45.3%，叶片相对含水量和叶绿素-a含量等生理参数增加。另一方面，地上部鲜重（113.7%）、地上部干重（74.8%）、叶数（24.9%）、根鲜重（115.5%）、根干重（62. 5%) 是在盐水条件下从 10% 生物炭改良剂中获得的。此外，两种剂量的生物炭改良剂都显着降低了超氧化物歧化酶 (SOD)、过氧化氢酶 (CAT) 和过氧化物酶 (POD) 的活性，以及​​丙二醛 (MDA) 和脯氨酸的含量，由于减少了氧化和渗透压力。总之，生物炭修正可能是减轻盐分胁迫对番茄幼苗不利影响的一种有前景的方法