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- Title
Roots Before Branches: Evidence of the Prunus Root Cambial Responses to the Environmental Stimuli.
- Authors
Ljubojević, Mirjana; Narandžić, Tijana
- Abstract
Current fruit production, relays on rootstocks that are size-controlling, productive and precocious. However, facing uneven precipitation distribution and long drought events, rootstocks' breeding goals should shift towards genotypes with roots promptly responding to the water availability. Thus, this study aimed to determine the root anatomical responses to the occurrence of drought episode (39 days) followed by the excessive precipitation event (113.6 mm in four days). Plant material included three cherry species and interspecific hybrid: Prunus cerasus, Prunus fruticosa, Prunus mahaleb and 'Gisela 5' (P. cerasus × Prunus canescens). Detailed anatomical analysis included root samples with the differentiated secondary structure taken from the sampling depth of 10–15 cm. The roots were to varying degrees affected by the precipitation and number of dry days, but all responded with the occurrence of the 'false' outer ring, after the excessive precipitation event. Furthermore, within all three species, a very clear pattern of vessel size production was observed: the inner ˃ the middle < the outer (newly formed) zone vessels, whilst in the interspecific hybrid this pattern could not be determined. Effective crown volumes measured in vegetations preceding (2021) and succeeding the drought episode (2022), indicated that trees grafted on P. cerasus, P. fruticosa and P. mahaleb genotypes fully recovered and achieved normal vegetative growth rates (≈30%), while trees on the 'Gisela 5' ceased their development (less than 10%). Our study indicates that indigenous germplasm can contribute to the substantial selection of genotypes successfully adapting to drought and rain episodes.
- Subjects
SOUR cherry; PRUNUS; CHERRIES; RAINFALL; WATER supply; DROUGHTS; ROOTSTOCKS
- Publication
Journal of Plant Growth Regulation, 2023, Vol 42, Issue 7, p4240
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-022-10887-9