Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (28): 72-77.doi: 10.11924/j.issn.1000-6850.casb20191100796

Special Issue: 生物技术

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Effects of High Temperature Stress on Physiological and Biochemical Indexes of Two Species of Paphiopedilum

Chen Xiuping(), He Manmei, Wang Wei, Li Xuwen, Zheng Yongxiao, Zhang Jifang, Dai Seping()   

  1. Guangzhou Institute of Landscape Gardening, Guangzhou 510405
  • Received:2019-11-05 Revised:2020-05-28 Online:2020-10-05 Published:2020-09-23
  • Contact: Dai Seping E-mail:xiuping_c@163.com;daiseping@126.com

Abstract:

The aim was to screen out and evaluate heat resistance indexes of Paphiopedilum. Taking the Paphiopedilum ‘Maudiae’ and the P. pacific ‘Shamrock’ introduced in Guangzhou as the materials, the two species were put into recovery at 25, 32, and 38 degrees for 5, 10, and 15 days. The changes of physiological indexes such as relative leaf greenness (SPAD), catalase (CAT) activity, peroxidase (POD) activity, malondiadehyde (MDA), soluble protein content, soluble sugar, and proline were measured. The heat tolerance of Paphiopedilum sp. under high temperature stress was studied. Through the comprehensive analysis with apparent observation and membership function method, the results showed that under the same cultivation condition, the heat resistance of P. pacific ‘Shamrock’ was higher than that of P. ‘Maudiae’. According to the main component analysis of the heat-tolerance coefficients of 7 individual physiological indexes, the cumulative contribution rate of SPAD, CAT and POD relative conductivity reached 66.92%. This result could provide a theoretical basis for ex situ introduction and application of the two species in landscaping.

Key words: Paphiopedilum, high temperature, physiological index, heat resistance, evaluation

CLC Number: