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Effects of environmental variables and cropping on leaf conductance of custard apple (Annona cherimola x Annona squamosa) 'African Pride'

Citation

George, AP and Nissen, RJ and Howitt, C, Effects of environmental variables and cropping on leaf conductance of custard apple (Annona cherimola x Annona squamosa) 'African Pride', Scientia Horticulturae, 45, (1-2) pp. 137-147. ISSN 0304-4238 (1990) [Refereed Article]

Copyright Statement

Copyright 1990 Elsevier Science Publishers B.V.

DOI: doi:10.1016/0304-4238(90)90076-Q

Abstract

Diurnal variations in leaf conductance (g) were investigated in bearing and non-bearing custard apple (Annona cherimola x Annona squamosa) trees, cultivar 'African Pride', in subtropical Queensland, Australia (latitude 27S). Most of the variation in log g could be attributed to changes in relative humidity (RH) (R2=0.86, P<0.01). At RH <60%, g was extremely low (<0.4 cm s-1). The marked sensitivity of custard apple stomata to RH suggests that CO2 assimilation could be dramatically reduced at low RH, and this may be one of the explanations for the poor fruit size of this cultivar. Although there were no significant differences in g on non-fruiting terminals of either bearing or non-bearing trees, the g of leaves adjacent to fruit was ∼20% lower than leaves on non-fruiting terminals at similar nodal positions. The productivity of custard apple in the field could be improved by techniques which raise RH, such as the use of windbreaks and overhead intermittent misting.

Item Details

Item Type:Refereed Article
Keywords:custard apple, leaf conductance, relative humidity
Research Division:Agricultural and Veterinary Sciences
Research Group:Horticultural Production
Research Field:Horticultural Crop Growth and Development
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Horticultural Crops not elsewhere classified
Author:Nissen, RJ (Mr Robert Nissen)
ID Code:112198
Year Published:1990
Web of Science® Times Cited:8
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2016-10-30
Last Modified:2017-05-01
Downloads:0

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