Metabolic Pathways for Observed Impacts of Crop Load on Floral Induction in Apple

International Journal of Molecular Sciences

Simone Rochfort¹  Tim Plozza¹  Priyanka Reddy¹  Vilnis Ezernieks¹  Dario Stefanelli²  Alessio Scalisi³  Ian Goodwin³ 

[1] Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia;Manjimup Horticulture Research Centre, Department of Primary Industries and Regional Development, Manjimup, WA 6258, Australia;Tatura SmartFarm, Agriculture Victoria, Tatura, VIC 3616, Australia;

关键词: chemical signalling;    metabolomics;    apple bud;    biennial bearing;    Malus domestica Borkh;    plant hormones;   

DOI  :  10.3390/ijms23116019

来源: DOAJ

【 摘 要 】

The triggers of biennial bearing are thought to coincide with embryonic development in apple and occurs within the first 70 days after full bloom (DAFB). Strong evidence suggests hormonal signals are perceived by vegetative apple spur buds to induce flowering. The hormonal response is typically referred to as the floral induction (FI) phase in bud meristem development. To determine the metabolic pathways activated in FI, young trees of the biennial bearing cultivar ‘Nicoter’ and the less susceptible cultivar ‘Rosy Glow’ were forced into an alternate cropping cycle over five years and an inverse relationship of crop load and return bloom was established. Buds were collected over a four-week duration within 70 DAFB from trees that had maintained a four-year biennial bearing cycle. Metabolomics profiling was undertaken to determine the differentially expressed pathways and key signalling molecules associated with biennial bearing. Marked metabolic differences were observed in trees with high and low crop load treatments. Significant effects were detected in members of the phenylpropanoid pathway comprising hydroxycinnamates, salicylates, salicylic acid biosynthetic pathway intermediates and flavanols. This study identifies plant hormones associated with FI in apples using functional metabolomics analysis.

【 授权许可】

Unknown