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2024 Vol.42, Issue 3 Preview Page

Research Article

Seed Characteristics of Passion Fruit (Passiflora edulis f. flavicarpa) Rootstocks with Different Genotypes and Responses of Their Seedlings to Drought Stress
Ye Wang12†
,
Caixia Chen12†
,
Jiayu Li12
,
Xiaoying Zhang12
,
Yao Teng3
,
Zixiong Zhang12
,
Xiuqin Long1*
1Guizhou Botanical Garden, Guizhou Academy of Sciences, Guiyang, Guizhou 550001, China
2Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwest China, Guiyang, Guizhou 550001, China
3Institute of Mountain Resources of Guizhou Province, Guizhou Academy of Sciences, Guiyang, Guizhou 550001, China
*Corresponding Author
†These authors contributed equally to this work.
30 June 2024. pp. 312-325
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Abstract

Unstable characteristics of rootstocks can easily lead to quality degradation and yield declines for passion fruit. Therefore, this study focused on the seed characteristics, growth, chlorophyll fluorescence parameters under drought stress, and antioxidant enzyme activity of passion fruit rootstocks with three genotypes (R1, R2, and R3). A correlation analysis and a membership function method were adopted for a comprehensive evaluation, expecting to screen out passion fruit rootstocks adaptable to drought-prone areas in China. According to the study results, the three passion fruit rootstocks were evidently different in terms of the seed morphology and germination characteristics. Specifically, the seed width and 1000 seeds weight of R1 were significantly superior to those of R2 and R3, but the germination potential and germination rate of R3 were 87.9% and 93.3%, respectively, significantly higher than those of R1 and R2. Meanwhile, R3 exhibited a greater amount of aboveground biomass and a smaller root-shoot ratio, along with a more efficient water metabolic capacity. The chlorophyll fluorescence parameters, i.e., the initial fluorescence (F0), maximum fluorescence (Fm) and variable fluorescence (Fv), of the rootstock seedlings with three genotypes were not found to be significantly different under drought stress, while the Fv/Fm ratio of R2 was significantly higher than that of R1. The minimum values of H2O2 and superoxide dismutase (SOD) appeared at 3 w after drought stress, and the minimum value of peroxidase (POD) and the peak value of catalase (CAT) were observed at week 4. As evidenced by the comprehensive evaluation, R3 is highly drought-resistant with good breeding potential.

Keywords
antioxidant enzyme activities
chlorophyll fluorescence parameters
correlation analysis
germination rate
membership function method
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 42
  • No :3
  • Pages :312-325
  • Received Date : 2023-11-13
  • Revised Date : 2024-01-22
  • Accepted Date : 2024-01-22
  • DOI :https://doi.org/10.7235/HORT.20240027
Journal Informaiton Horticultural Science and Technology Horticultural Science and Technology
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