The effect of defruiting at different stages of fruit development on leaf photosynthesis of 'Golden Delicious' apple

Autor:	S. Tustin, L. Corelli Grappadelli, Riccardo Gucci, G. Ravaglia
Rok vydání:	1995
Předmět:	Malus Horticulture biology Physiology Carbon fixation Relative growth rate Fruit development Shoot Plant Science Photosynthesis biology.organism_classification Morning
Zdroj:	Tree Physiology. 15:35-40
ISSN:	1758-4469 0829-318X
Popis:	Net photosynthetic rates (A) of leaves on 11-year-old, field-grown apple trees (Malus domestica Borkh. cv. Golden Delicious) were measured after removal of fruits at four different stages of development. Defruiting decreased A by 21, 42, 27 and 7% when fruits were growing at 311, 293, 229 and 113 mg(DW) day(-1), respectively. Photosynthesis was inhibited more in the afternoon than in the morning, but it was not affected during the first 8 h after fruit removal. Inhibition of A was positively correlated with crop sink strength, but it was not correlated with fruit relative growth rate or crop load. Defruiting decreased A at saturating irradiances (PPFD > 1000 micro mol m(-2) s(-1)), but did not modify the apparent quantum yield of single leaves. These results suggest that the overall effect of defruiting on carbon fixation is negligible in dense canopies, but it may be significant in sparse canopies and in single shoots.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::415408c9296e16f2331348e413100bc0 https://doi.org/10.1093/treephys/15.1.35 Zobrazit plný text záznamu