@Article{phyton.2022.020041,
AUTHOR = {Lingyan Hu, Haiyan Chen, Guangqun Zhang, Zihao Yu, Kai Yan, Fangdong Zhan, Yongmei He},
TITLE = {Effects of Auxin at Different Concentrations on the Growth, Root Morphology and Cadmium Uptake of Maize (<i>Zea mays</i> L.)},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {91},
YEAR = {2022},
NUMBER = {9},
PAGES = {1933--1944},
URL = {http://www.techscience.com/phyton/v91n9/47722},
ISSN = {1851-5657},
ABSTRACT = {Indoleacetic acid (IAA) is an important regulator that plays a crucial role in plant growth and responses to abiotic
stresses. In the present study, a sand cultivation experiment was carried out to investigate the effects of IAA at
different concentrations (0, 0.01, 0.1, 0.5, 1, and 2.5 mmol/L) on maize growth, root morphology, mineral elements (Ca, Mg) and Cd uptake under 20 mg/kg Cd stress. The results showed that 0.01 mmol/L is the optimal
IAA concentration for enhancing the Cd tolerance of maize. Compared with the control treatment, 0.01 mmol/L
IAA promoted maize growth, with significant increases in the height, shoot and root biomass by 34.6%, 25.0%
and 16.3%; altered the root morphology, with increases in root length, root tip number, and root tip density
by 8.9%, 31.4% and 20.7%, respectively; and enhanced the mineral element uptake of maize, resulting in signifi-
cant increases in the Ca content in shoots and roots by 640.6% and 1036.4% and in the Mg content in shoots by
205.8%, respectively. In addition, 0.01 mmol/L IAA decreased the Cd content and uptake in the shoots by 51.9%
and 39.6%, respectively. Furthermore, the Cd content and uptake exhibited a significant negative correlation with
Ca content in roots and a significantly positive correlation with root morphology, and the Cd content in shoots
was significantly and negatively correlated with root tip number. Thus, 0.01 mmol/L IAA was effective in enhancing the Cd tolerance and plant growth of maize.},
DOI = {10.32604/phyton.2022.020041}
}