Vitali K F, Ximenez G R, Guerreiro R G O, Silva T M, Romagnolo M B, Pastorini L H
Universidade Estadual de Maringá, Centro de Ciências Biológicas, Programa de Pós-Graduação em Biologia Comparada - PGB, Maringá, PR, Brasil.
Universidade Estadual de Maringá, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura - Nupelia, Programa de Pós-Graduação em Biologia Comparada - PGB, Maringá, PR, Brasil.
Braz J Biol. 2025 Feb 7;84:e289149. doi: 10.1590/1519-6984.289149. eCollection 2025.
Climate change is among the main causes of alterations in natural ecosystems, generating major impacts on native vegetation. Drought is considered one of the main threats to ecosystems under global climate change since it limits growth and the mobilization of carbohydrates, alters the photosynthetic rate, decreases productivity, and can cause higher rates of plant mortality. Studies have been using species of the fungus Trichoderma in the inoculation of plants under conditions of water stress, such as drought, however, its use in native tree plants is still scarce. Considering that Inga laurina (Sw.) Willd (Fabaceae) is a tree species found preferentially in humid or flooded regions and can be used in the recovery of degraded areas, the aim is to analyze the performance of young plants of I. laurina, inoculated and not inoculated with Trichoderma harzianum and kept in conditions of moderate drought and in pot capacity. After 21 days, we evaluated the length of the aerial part and root, the fresh and dry mass of the root, stem, and leaves, the number of leaves and the diameter of the collar, the total soluble carbohydrate content of the leaves and roots and the photosynthetic pigments in the leaves of the plants from each treatment. The results were statistically analyzed using the GraphPrim 8.0 statistical program. Plants kept in moderate drought, whether inoculated or not, showed no significant difference in terms of growth parameters. The chlorophyll a, chlorophyll b, total chlorophyll, and total carotenoid contents were lower in the plants under moderate drought as compared to the non-inoculated control plants, while the chlorophyll a/b ratio was higher in the inoculated plants. The content of total soluble carbohydrates was higher in the leaves of plants kept in moderate drought, with no significant difference observed in the roots of plants kept in the different treatments. When comparing leaves and roots for each treatment, there was a higher total soluble carbohydrate content in the roots, regardless of the treatment. Overall, there was a positive effect of T. harzianum in promoting growth and protecting I. laurina; the inoculated plants performed similarly to the plants in the control condition.
气候变化是自然生态系统发生改变的主要原因之一，对本地植被产生重大影响。干旱被认为是全球气候变化下生态系统面临的主要威胁之一，因为它限制了植物的生长和碳水化合物的转运，改变光合速率，降低生产力，并可能导致更高的植物死亡率。已有研究在水分胁迫条件下，如干旱时，使用木霉菌种接种植物，然而，其在本地树木上的应用仍然很少。鉴于阔叶香豆（豆科）是一种优先生长在湿润或水淹地区的树种，可用于退化地区的恢复，本研究旨在分析接种和未接种哈茨木霉并保持在中度干旱和盆栽条件下的阔叶香豆幼苗的生长表现。21天后，我们评估了地上部分和根系的长度、根、茎和叶的鲜重和干重、叶片数量和茎基部直径、叶和根中的总可溶性碳水化合物含量以及各处理植株叶片中的光合色素。使用GraphPrim 8.0统计程序对结果进行统计分析。处于中度干旱条件下的植株，无论是否接种，其生长参数均无显著差异。与未接种的对照植株相比，中度干旱条件下植株的叶绿素a、叶绿素b、总叶绿素和总类胡萝卜素含量较低，而接种植株的叶绿素a/b比值较高。中度干旱条件下植株叶片中的总可溶性碳水化合物含量较高，不同处理植株的根中未观察到显著差异。比较各处理的叶和根时，无论处理如何，根中的总可溶性碳水化合物含量均较高。总体而言，哈茨木霉对促进阔叶香豆生长和保护其具有积极作用；接种植株的表现与对照条件下的植株相似。
