■钾和磷是植物生长和发育必需的大量营养素。然而,大多数P和K以不溶的形式存在,植物很难直接吸收和利用,从而导致植物在P或K缺乏胁迫下的生长迟缓。曲霉菌具有促进生长的特性和溶解P和K的能力。
■这里,为了研究在缺乏磷或钾的情况下刺槐对百慕大草的生理作用,将刺耳杆菌和百慕大草用作实验材料。
■结果表明,尖刺能促进百慕大草对缺磷或缺钾胁迫的耐受性,降低叶子死亡率,增加粗脂肪和粗蛋白的含量。此外,A.aculeatus显着提高了叶绿素ab和类胡萝卜素的含量。此外,在P或K缺乏胁迫下,接种A.aculeatus的百慕大草显示较高的N,P,和K含量高于未接种的植物。此外,外源性A.aculeatus显着降低H2O2水平以及CAT和POD活性。根据我们的结果,A.aculeatus可以有效地提高百慕大草的饲草质量,减轻P或K缺乏胁迫的负面影响。从而在饲草业中发挥积极的经济作用。
UNASSIGNED: Potassium and phosphorus are essential macronutrients for plant growth and development. However, most P and K exist in insoluble forms, which are difficult for plants to directly absorb and utilize, thereby resulting in growth retardation of plants under P or K deficiency stress. The Aspergillus aculeatus fungus has growth-promoting characteristics and the ability to dissolve P and K.
UNASSIGNED: Here, to investigate the physiological effects of A. aculeatus on bermudagrass under P or K deficiency, A. aculeatus and bermudagrass were used as experimental materials.
UNASSIGNED: The results showed that A. aculeatus could promote tolerance to P or K deficiency stress in bermudagrass, decrease the rate of leaf death, and increase the contents of crude fat as well as crude protein. In addition, A. aculeatus significantly enhanced the chlorophyll a+b and carotenoid contents. Moreover, under P or K deficiency stress, bermudagrass inoculated with A. aculeatus showed higher N, P, and K contents than non-inoculated plants. Furthermore, exogenous A. aculeatus markedly decreased the H2O2 level and CAT and POD activities. Based on our results, A. aculeatus could effectively improve the forage quality of bermudagrass and alleviate the negative effects of P or K deficiency stress, thereby playing a positive economic role in the forage industry.