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Photosynthesis and diffusion conductance of the valencia orange fruit under field conditions
Year:
1980
Source of publication :
Journal of Experimental Botany
Authors :
Moreshet, Samuel
;
.
Volume :
31
Co-Authors:
Moreshet, S., Soil and Irrigation Research Institute, Pretoria, South Africa
Green, G.C., Soil and Irrigation Research Institute, Pretoria, South Africa
Facilitators :
From page:
15
To page:
27
(
Total pages:
13
)
Abstract:
CO 2 uptake and diffusion conductance of Valencia orange fruits (Citrus sinensis L. Osbeck) were measured in the field during the growing season of 1977/78 to ascertain if, as in the leaf, stomata control photosynthesis and transpiration under changing environmental conditions. Measurements were made on 15 year old trees grown in a sandy loam soil and receiving either a dry or a wet treatment. Fruit diffusive conductance was measured with a modified water vapour diffusion conductance meter and gross photosynthesis was measured with a 14CO 2 uptake meter. Photosynthetically active radiation (PAR) was measured with a quantum sensor. Fruits exposed to light assimilated CO 2 at a rate which was 25-50% of that assimilated by leaves. The uptake was dependent on fruit size, PAR, chlorophyll content, and on diffusive conductance of the fruit epidermis. Epidermal conductance showed a diurnal trend which was similar in shape to that of the leaf except in the late afternoon. Cuticular conductance of the fruit was calculated and ranged between 0.22 and 0.30 mm s -1. It was speculated that the CO 2 uptake by the fruit could support the growth of flavedo cell layers when exposed to light. Dry soil caused an increase in the 14CO 2 uptake by fruit possibly caused by the increased potential area of the stomatal opening per unit of fruit surface area. © 1980 Oxford University Press.
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More details
DOI :
10.1093/jxb/31.1.15
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28572
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:40
Scientific Publication
Photosynthesis and diffusion conductance of the valencia orange fruit under field conditions
31
Moreshet, S., Soil and Irrigation Research Institute, Pretoria, South Africa
Green, G.C., Soil and Irrigation Research Institute, Pretoria, South Africa
Photosynthesis and diffusion conductance of the valencia orange fruit under field conditions
CO 2 uptake and diffusion conductance of Valencia orange fruits (Citrus sinensis L. Osbeck) were measured in the field during the growing season of 1977/78 to ascertain if, as in the leaf, stomata control photosynthesis and transpiration under changing environmental conditions. Measurements were made on 15 year old trees grown in a sandy loam soil and receiving either a dry or a wet treatment. Fruit diffusive conductance was measured with a modified water vapour diffusion conductance meter and gross photosynthesis was measured with a 14CO 2 uptake meter. Photosynthetically active radiation (PAR) was measured with a quantum sensor. Fruits exposed to light assimilated CO 2 at a rate which was 25-50% of that assimilated by leaves. The uptake was dependent on fruit size, PAR, chlorophyll content, and on diffusive conductance of the fruit epidermis. Epidermal conductance showed a diurnal trend which was similar in shape to that of the leaf except in the late afternoon. Cuticular conductance of the fruit was calculated and ranged between 0.22 and 0.30 mm s -1. It was speculated that the CO 2 uptake by the fruit could support the growth of flavedo cell layers when exposed to light. Dry soil caused an increase in the 14CO 2 uptake by fruit possibly caused by the increased potential area of the stomatal opening per unit of fruit surface area. © 1980 Oxford University Press.
Scientific Publication
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