Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (3): 739-746.DOI: 10.3969/j.issn.1000-2561.2021.03.019

• Plant Cultivation, Physiology & Biochemistry • Previous Articles     Next Articles

Different Responses to Low Potassium Stress Between Two Sugarcane Varieties from the Same Hybrid Combination

ZENG Qiaoying, WU Jiayun, FENG Xiaoming, ZHANG Nannan, WU Zilin, QI Yongwen*()   

  1. Guangdong Key Lab of Sugarcane Improvement and Biorefinery / Guangzhou Sugarcane Industry Research Institute, Guangzhou, Guangdong 510316, China
  • Received:2020-03-19 Revised:2020-05-06 Online:2021-03-25 Published:2021-03-25
  • Contact: QI Yongwen

Abstract:

Two sugarcane varieties (YT55 and YT00-236) from the same hybrid combination were used to analyze the different responses to low potassium (K) stress. The growth parameters, K contents, K utilization and uptake effeciency under longterm low K stress, and the K contents, activites of antioxidative enzymes under shortterm low K stress were investigated. The results revealed that significant differences were found for height, diameter, biomass between the two varieties under longterm low K stress. The height, diameter, shoot and root biomass decreased significantly in YT55 under longterm low K stress, while only root biomass showed noticeable reduction in YT00-236. The K contents in shoots and roots of the two varieties decreased under longterm low K stress. The rate decrease of K content in YT55 was higher than that in YT00-236 under longterm low K stress, but the utilization effeciency and uptake effeciency in YT00-235 were higher than those in YT55. The K content in the roots of YT55 began to decrease after 48 h under low K stress, whereas significant reduction was found for K content in the roots of YT00-236 after 24 h under low K stress. The MDA content in the roots of YT55 showed significant increase after 48 h under low K stress, but after 72 h under low K stress in the roots of YT00-236. The activities of SOD and POD decreased under low K stress in roots of YT55, but notably increased after 48 h under low K stress in the roots of YT00-236. These results indicated that significant difference for low K tolerance existed between the varieties from the same hybrid combination. Improvement in K utilization and uptake effeciency and activities of antioxidative enzymes might help to increase the low K tolerance in sugarcane.

Key words: sugarcane, low K stress, K content, activities of antioxidative enzymes

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