Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (8): 2283-2288.DOI: 10.3969/j.issn.1000-2561.2021.08.022

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

Physiological Effects of PEG Stress on Drought Tolerance of Different Date Palm

ZHANG Ning1,2,4, XU Zhongliang1,2,4, FU Haiquan1,4, ABDELAAL W B3, LI Dongxia1,4, WANG Yi1,4, WANG Fuyou1,2,4,*()   

  1. 1. Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan 571300, China
    2. Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off - season Reproduction Regions, Sanya, Hainan 572000, China
    3. Central Laboratory for Date Palm Research and Development of Agriculture Research Center, Giza 11435, Egypt
    4. National Tropical Palm Germplasm Reserve, Wenchang, Hainan 571300, China
  • Received:2020-08-27 Revised:2020-10-09 Online:2021-08-25 Published:2021-09-09
  • Contact: WANG Fuyou

Abstract:

In order to evaluate the drought stress tolerance of three date palm cultivars (‘Sewi’ ‘Helali’ ‘Khadrawy’), different concentrations of PEG were used for stress treatment to discuss the characteristics of growth index and physiological index changes of date palm seeds and seedlings of different varieties under PEG stress. ‘Khadrawy’ had the highest seed germination rate under high PEG stress, followed by ‘Sewi’ cultivars. At the seedling stage, when the three cultivars were subjected to 15% PEG and 25% PEG stress, the fresh plant weight and root length of ‘Khadrawy’ were the highest, the osmotic stress tolerance ability was the strongest, the physiological index content of proline was high, and the content of malondialdehyde (MDA) was low. Therefore, ‘Khadrawy’ had a large growth capacity and the strongest osmotic regulation ability under high concentration PEG stress, ‘Sewi’ was the second, and ‘Helali’ was the third. In conclusion, ‘Khadrawy’ may be more suitable for planting in arid regions, such as Ledong, Dongfang, Sansha and Sanya in Hainan, which are perennial arid and rainless, and salinization regions, while ‘Helali’ may be more suitable for planting in regions with a certain amount of precipitation but less precipitation, such as Changjiang, Lingshui in Hainan and Yuanjiang in Yunnan.

Key words: date palm, PEG, stress, proline, malondialdehyde (MDA)

CLC Number: