Histological, physio-biochemical, and transcriptomic analyses reveal the potential limiting factors for successful grafting of pecan

doi:10.1007/s11676-023-01681-8

Abstract

Abstract:

Budding is an important grafting technique to asexually propagate pecan (Carya illinoinensis (Wangenh.) K. Koch). To determine factors that might hamper successful budding of the species, a representative easy-to-survive cultivar ‘Pawnee’ and a typical difficult-to-survive cultivar ‘Jinhua’ were used for comprehensive analysis. Morphological observation showed that cells surrounding the secretory cells or sieve tube had collapsed in ‘Jinhua’ but not in ‘Pawnee’ during grafting. ‘Jinhua’ might suffer more hypoxia stress than ‘Pawnee’ as ‘Jinhua’ had higher catalase, superoxide dismutase, polyphenol oxidase, pyruvate decarboxylase (PDC), alcohol dehydrogenase (ADH) activities during grafting and contained greater levels of hydrogen peroxide 12 days after grafting (DAG). Transcriptions of PDC and ADH were also up-regulated significantly in ‘Jinhua’ whereas they were not significantly affected in ‘Pawnee’. Phenylalanine ammonia-lyase activities of ‘Jinhua’ were consistently lower than that of ‘Pawnee’. Initial phenol contents were similar between the two cultivars. Graft-promoting substances, including soluble sugar, soluble protein, and gibberellin (GA) were incompletely recovered in ‘Jinhua’ 12 DAG while fully restored in ‘Pawnee’. Increased levels of trans-zeatin riboside in ‘Jinhua’ were much smaller than in ‘Pawnee’ 3 DAG. The contents of indole-3-acetic acid were similar, and the dynamics of abscisic acid were the same between the two genotypes. Results suggest that hypoxia stress and shortages of sugar, protein, GA, and cytokinin during the healing process might be key factors limiting successful budding of pecan. The degree of scion-rootstock compatibility and the content of phenols might be excluded as constraints for successful budding.

Key words: Pecan, Grafting, Histology, Biochemistry, Transcriptome analysis

Zhenghai Mo, Xufeng Yang, Longjiao Hu, Min Zhai, Jiping Xuan. Histological, physio-biochemical, and transcriptomic analyses reveal the potential limiting factors for successful grafting of pecan[J]. JOURNAL OF FORESTRY RESEARCH, 2024, 35(1): 35-.

Zhenghai Mo, Xufeng Yang, Longjiao Hu, Min Zhai, Jiping Xuan. [J]. 林业研究(英文版), 2024, 35(1): 35-.

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