Achene dormancy characteristics of three rose species and the methods for improving germination | [Pakistan Journal of Botany • 2023]

Author(s):

1. ZHIQIONG ZHOU: Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University,Fuzhou 350007,China; 2Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan, 610041, China

2. DANDAN WEI: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences,Chengdu, Sichuan, 610041,China

3. XIAOMING LI: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences,Chengdu, Sichuan, 610041,China

4. YULAN PENG: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences,Chengdu, Sichuan, 610041,China

5. FUZHONG WU: Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University,Fuzhou 350007,China

Abstract:

Roses are a group of world famous garden plants, and strong dormancy exists in the achenes. We characterized the water absorption of achenes, the inhibition of extracts of pulp and achenes, effects of different pretreatments on breaking dormancy to determine the dormancy type and mechanism. Achenes of three rose species had physiological dormancy (PD) based on the water-permeable seed coat and fully developed embryo. Rosa rubus had intermeditate PD, and Rosa longicuspis and Rosa helenae had deep PD. The best treatment for improving germination was warm plus cold stratification, as indicated by higher germination percentage (GP) and lower moldy achene percentage for R. rubus (74.9±2.1%) and R. longicuspis (25.9±2.1%). For R. helenae, GP (36.3±1.5%) was highest treated by H2SO4 scarification followed by warm stratification at 25°C for eight weeks and cold stratification at 5°C for sixteen weeks. Prolonged period of cold stratification significantly increased germination speed and moldy achene percentage especially when combined with H2SO4 scarification. The physiological dormancy of rose achenes was caused jointly by inhibitory substances in pulp and achenes, mechanical barrier of thick pericarp and physiological dormancy in embryo.

Page(s): 327-336

DOI: 10.30848/PJB2023-1(5)

Published: Journal: Pakistan Journal of Botany, Volume: 55, Issue: 1, Year: 2023

Keywords:

Scarification , Rose , Achene dormancy , Dormancy type , Cold stratification

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