Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (5): 1348-1354.DOI: 10.3969/j.issn.1000-2561.2021.05.021

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

Alleviation Effect of Foliar Application with Seaweed Extract on Sugarcane under Drought Stress

CHEN Diwen1,4, ZHOU Wenling1, AO Junhua1,*(), HUANG Zhenrui2,*(), BAO Shixiang3, ZOU Xiaoxiao3, SHEN Hong4   

  1. 1. Institute of Bioengineering, Guangdong Academy of Sciences / Guangdong Modern Agricultural Technology Research and Development Center (Resources, Environment and Agricultural Product Safety), Guangzhou, Guangdong 510316, China
    2. Crops Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong 510640, China
    3. Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    4. College of Resource and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China
  • Received:2020-07-08 Revised:2020-07-21 Online:2021-05-26 Published:2021-05-25
  • Contact: AO Junhua,HUANG Zhenrui

Abstract:

The effect of foliar application with seaweed extract (SE) on the physiological parameters of sugarcane leaves and plant morphological indexes under drought stress were studied to improve the drought resistance of sugarcane. Two sugarcane varieties ‘YT159’ and ‘ROC22’ were used as the test materials. Pot culture was used to foliar application of seaweed extract in different dosages “SE1” and “SE2” under conventional irrigation conditions “C” and drought stress conditions “D”, respectively. Plant morphological indexes including plant height, stem diameter, fresh weight, and leaf physiological parameters including water parameters and antioxidant enzyme activity were measured. The results showed that the physiological parameters in sugarcane leaves and morphological indexes treated with seaweed extract (C+SE1, C+SE2) were not significantly different from those in the C treatment. Under drought stress (D+SE1, D+SE2), the seaweed extract application significantly reduced the leaf dehydration rate, electrical conductivity, proline content, relative water content and fresh plant weight. Besides, drought resistance coefficient was significantly improved, and ‘YT159’ performed better than ‘ROC22’. Therefore, the foliar application with seaweed extract under drought stress could significantly improve the physiological parameters of sugarcane leaves and plant morphological indicators, and increase the fresh plant weight, so as to alleviate the damage of drought stress to sugarcane and improve the drought resistance ability of sugarcane.

Key words: seaweed extract, sugarcane, drought stress, foliar application, physiological characteristic

CLC Number: