Response of sink manipulation in Lapins sweet cherry (Prunus avium L.) branches to late-deficit irrigation
Date
Authors
JORQUERA FONTENA, EMILIO JOSE
TIGHE NEIRA, RICARDO MARCELO
INOSTROZA BLANCHETEAU, CLAUDIO ANDRES
Jorquera-Fontena, Emilio
Tighe-Neira, Ricardo
Bota, Josefina
Inostroza-Blancheteau, Claudio
Pastenes, Claudio
TIGHE NEIRA, RICARDO MARCELO
INOSTROZA BLANCHETEAU, CLAUDIO ANDRES
Jorquera-Fontena, Emilio
Tighe-Neira, Ricardo
Bota, Josefina
Inostroza-Blancheteau, Claudio
Pastenes, Claudio
Authors
Date
Datos de publicación:
10.1016/j.scienta.2022.111323
Keywords
Fruit Yield And Quality - Leaf Soluble Sugars - Photosynthesis - Source-sink Relationships - Water Deficit - Evapotranspiration - Irrigation - Photosynthesis - Source-sink Dynamics
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Abstract
Photosynthetic traits, leaf soluble sugars and fruit yield and size were evaluated in order to identify the role of early sink manipulation (girdling and fruiting spur thinning applied in winter) in modulating the effect of late-deficit irrigation (recovering 60% of crop evapotranspiration during 36 days pre-harvest) in Lapins sweet cherry branches. Photosynthesis (P<inf>N</inf>), stomatal conductance (g<inf>s</inf>), and fruit weight were affected by both treatments, whereas intercellular CO<inf>2</inf> concentration of leaves (C<inf>i</inf>), mesophyll conductance (g<inf>m</inf>), Rubisco carboxylase activity (V<inf>cmax</inf>), electron transport rate (J<inf>max</inf>), leaf soluble sugars and branch yield were exclusively affected by sink manipulation. The effect of sink manipulation on P<inf>N</inf> was mainly observed in the girdling treatment as it was not altered by thinning. In girdled branches, P<inf>N</inf> dropped by 34%, accompanied by a two-fold increase in leaf soluble sugars, indicating that sink feedback regulation of carbon assimilation occurred. Irrespective of the irrigation, the higher P<inf>N</inf> observed in the controls were not sufficient to achieve the fruit weight and yield of the girdled branches, indicating that fruit carbon demand in control branches was source-limited. The depressed P<inf>N</inf> by girdling was associated with significant reductions in g<inf>s</inf>, g<inf>m</inf>, V<inf>cmax</inf> and J<inf>max</inf>. Since lowered P<inf>N</inf> by deficit irrigation was neither attributable to a g<inf>s</inf>-associated decrease in C<inf>i</inf> nor to changes in any other photosynthetic variable, further research is needed to clarify this point. Results showed that irrigation deficit was sufficient to reduce P<inf>N</inf> in girdled branches, whereas it had no effect in control and thinned branches. Thus, the depressive effect of deficit irrigation on P<inf>N</inf> appeared to be exacerbated by the sink effect. © 2022 Elsevier B.V., All rights reserved.
Description
Keywords
Fruit Yield And Quality , Leaf Soluble Sugars , Photosynthesis , Source-sink Relationships , Water Deficit , Evapotranspiration , Irrigation , Photosynthesis , Source-sink Dynamics
Citation
10.1016/j.scienta.2022.111323