Work

Growth, chlorophyll content, photosynthesis and water relations in guava ( Psidium guajava L.) under salinity and different nitrogen supply

Year: 1999

Type: article

Abstract: Summary The influence of NaCl and different levels of nitrogen supply (5, 10 and 15 mM Ca(NO 3 ) 2 ) on growth and physiological parameters of two Sudanese guava cultivars (white and red fruit flesh) were investigated. Under saline conditions shoot growth and leaf chlorophyll content in guava trees were reduced. However, moderate N supply improved these parameters. NaCl salinity reduced net photosynthesis rate (PN) and transpiration (T) of both guava cultivars, but moderate nitrogen supply enhanced PN and T. Stomatal resistance (R s ) was high under NaCl salinity conditions, whereas it was comperatively low for trees moderately supplied with nitrogen. The salinity-induced decrease of PN in red guava is attributed to stomatal closure. In white guava this was rather an effect of non-stomatal factors. The xylem flow rate followed similar patterns for both cultivars and for all treatments except those supplied with NaCl only. The highest flow rates were noticed for both cultivars under moderate nitrogen supply. The red guava is supposed to possess a better salt tolerance compared to white guava.

Source: European Journal of Horticultural Science

DOI: 10.1079/ejhs.1999/7110

Authors: H. M. Ali-Dinar, G. Ebert, P. Lüdders

Institution: Humboldt-Universität zu Berlin

Language: English

Topic: Plant Stress Responses and Tolerance

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: hybrid

Funders: Alexander von Humboldt-Stiftung, University of Cambridge