Superficial scald is a post-harvest chilling storage injury leading to browning of the surface of the susceptible cv Granny Smith apples. Wounding of skins has been reported to play a preventive role on scald development however its underlying molecular factors are unknown. We have artificially wounded the epidermal and sub-epidermal layers of apple skins consistently obtaining the prevention of superficial scald in the surroundings of the wounds during two independent vintages. Time course RNA-Seq analyses of the transcriptional changes in wounded versus unwounded skins revealed that two transcriptional waves occurred. An early wave included genes up-regulated by wounding already after 6 h, highlighting a specific transcriptional rearrangement of genes connected to the biosynthesis and signalling of JA, ethylene and ABA. A later transcriptional wave, occurring after three months of cold storage, included genes up-regulated exclusively in unwounded skins and was prevented from its occurrence in wounded skins. A significant portion of these genes was related to decay of tissues and to the senescence hormones ABA, JA and ethylene. Such changes suggest a wound-inducible reversed hormonal balance during post-harvest storage which may explain the local inhibition of scald in wounded tissues, an aspect that will need further studies for its mechanistic explanation

Cainelli, N.; Forestan, C.; Angeli, D.; Roman Villegas, T.; Costa, F.; Botton, A.; Rasori, A.; Bonghi, C.; Ruperti, B. (2021). Transcriptomic insights on the preventive action of apple (cv Granny Smith) wkin wounding on superficial scald development. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 22 (24): 13425. doi: 10.3390/ijms222413425 handle: http://hdl.handle.net/10449/71316

Transcriptomic insights on the preventive action of apple (cv Granny Smith) wkin wounding on superficial scald development

Angeli, Dario;Roman Villegas, Tomas;
2021-01-01

Abstract

Superficial scald is a post-harvest chilling storage injury leading to browning of the surface of the susceptible cv Granny Smith apples. Wounding of skins has been reported to play a preventive role on scald development however its underlying molecular factors are unknown. We have artificially wounded the epidermal and sub-epidermal layers of apple skins consistently obtaining the prevention of superficial scald in the surroundings of the wounds during two independent vintages. Time course RNA-Seq analyses of the transcriptional changes in wounded versus unwounded skins revealed that two transcriptional waves occurred. An early wave included genes up-regulated by wounding already after 6 h, highlighting a specific transcriptional rearrangement of genes connected to the biosynthesis and signalling of JA, ethylene and ABA. A later transcriptional wave, occurring after three months of cold storage, included genes up-regulated exclusively in unwounded skins and was prevented from its occurrence in wounded skins. A significant portion of these genes was related to decay of tissues and to the senescence hormones ABA, JA and ethylene. Such changes suggest a wound-inducible reversed hormonal balance during post-harvest storage which may explain the local inhibition of scald in wounded tissues, an aspect that will need further studies for its mechanistic explanation
Apple superficial scald
Post-harvest
Cold storage
Abiotic stress
Jasmonic acid
Ethylene
Senescence
RNA-Seq
Transcriptomics
Settore AGR/03 - ARBORICOLTURA GENERALE E COLTIVAZIONI ARBOREE
2021
Cainelli, N.; Forestan, C.; Angeli, D.; Roman Villegas, T.; Costa, F.; Botton, A.; Rasori, A.; Bonghi, C.; Ruperti, B. (2021). Transcriptomic insights on the preventive action of apple (cv Granny Smith) wkin wounding on superficial scald development. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 22 (24): 13425. doi: 10.3390/ijms222413425 handle: http://hdl.handle.net/10449/71316
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