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Stomatic behaviour and leaf water potential in young plants of Annona squamosa submitted to saline stress

Published online by Cambridge University Press:  15 July 2004

Mansur Custódio Nogueira Rejane Jurema ,
Aloufa Magdi Ahmed Ibrahim  and
Bandeira de Albuquerque Manoel
Mansur Custódio Nogueira Rejane Jurema
Affiliation:
 Depto. de Biologia/UFRPE, Bolsista CNPq, Rua Dom Manuel de Medeiros s/n°, Dois Irmãos, CEP 52171-9000 Recife, PE, Brazil
Aloufa Magdi Ahmed Ibrahim
Affiliation:
Depto Botânica, Ecologia e Zoologia/UFRN, CEP 59075-260 Natal, RN, Brazil
Bandeira de Albuquerque Manoel
Affiliation:
 UFRPE, Bolsista CNPq, Brazil
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Abstract

Introduction. In saline soils, the water absorption process of the plants is negatively affected, due to the permeability of the roots, leading to hydric stress. Plants under saline stress close their stomas earlier than plants not in these conditions; this causes an increase in stomatal resistance due to the decrease in water potential. The aim of the present research was to detect alterations in the stomatic behaviour and leaf water potential in young plants of Annona squamosa submitted to saline stress. Materials and methods. Sixty-day-old seedlings of A. squamosa were acclimated for 15 days in a greenhouse, before being submitted to different saline treatments. Five treatments (T0 = 0 mM; T1 = 25 mM; T2 = 50 mM; T3 = 75 mM and T4 = 100 mM of NaCl in a nutritive solution) were applied with six replications. The evaluations of the stomatic response occurred on the 20th, 30th, 40th, 60th, 80th and 90th days after the beginning of the saline treatments. The transpiration measures, diffusive resistance and leaf temperature were registered in the first mature leaf. The photosynthetically active radiation, relative humidity and air temperature within the greenhouse were simultaneously assessed 60 and 90 days after the beginning of treatments; then the leaf water potential (Rleaf) was also measured. Results. During the time of the experiment the leaf temperature and its difference from the air temperature was not affected by NaCl levels, but only 90 days after the beginning of the treatments the values observed in the control plants were lower than those observed in the 25 mM treatment. The diffusive resistance after 40 days was increased in all NaCl treatments. The transpiration, independent of treatment, was reduced by 44.1% (at 60 days) and 13.4% (at 90 days) with the 100-mM treatment compared with the control treatment. The increment in NaCl induced a decrease in Rleaf in all treatments, but an equal reduction was observed for each treatment after 60 and 90 days. Conclusion. The NaCl levels affected the transpiration and leaf water potential; however, the leaf water potential showed an equal reduction in all treatments on the 60th and 90th days.

Keywords

BrazilAnnona squamosasoil salinityosmotic stresstranspirationstomatawater potentialBrésilAnnona squamosasalinité du solstress osmotiquetranspirationstomatepotentiel hydrique
Type
Research Article
Information
Fruits , Volume 59 , Issue 3 , May 2004 , pp. 209 - 214
Copyright
© CIRAD, EDP Sciences

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