论文部分内容阅读
用6个棉花品种作为试验材料,通过水培试验比较其对钾的吸收能力,研究其根系形态学、生理学特征和K+吸收动力学参数。结果表明,低钾胁迫下,钾高效品种中棉所64的根干物质质量、根体积、根活跃吸收面积、根活跃比表面积最大,根系活力最强;钾高效品种中棉所35的根干物质质量较大、根长而细,根总吸收面积最大,根总比表面积都最大,根系活力也较强,且K+最大吸收速率Imax最大,最小临界浓度Cmin较小,耐低钾能力强。而钾低效品种中棉所50和中植棉2号的根系形态学等指标都较差,根系活力较弱,且Imax也较小。该研究不仅有助于阐明棉花耐低钾胁迫的机理,而且能评价不同品种对低钾的适应能力。
Six cotton cultivars were used as experimental materials to compare their potassium absorption capacity through hydroponics and to study their root morphology, physiological characteristics and K + absorption kinetic parameters. The results showed that under low potassium stress, the root dry matter mass, root volume, active absorption area, active root surface area and root activity of Zhongmiansuo 64, a potassium efficient cultivar, The results showed that the highest total absorption area, the largest total root specific surface area, the highest root activity, and the largest K max absorption rate Imax, the smallest critical concentration Cmin, and the low potassium tolerance were the highest. However, the root morphological indexes such as Zhongmiansuo 50 and Zhongmianmian 2, which are both low-K fertilizers, were poor in root activity and Imax. The study not only helps to elucidate the mechanism of cotton tolerance to low potassium stress, but also evaluate the adaptability of different varieties to low potassium.