Adaptive responses to salinity: seed germination traits of Sonneratia apetala along salinity gradient in Sundarbans Bangladesh

Nasrin S., . and Mahmood H., . and Siddique M. R. H., . and Masudur M. R., . Adaptive responses to salinity: seed germination traits of Sonneratia apetala along salinity gradient in Sundarbans Bangladesh. pp. 179-186. ISSN 0128-1283

Water and soil salinity of the Sundarbans are increasing due to continuous reduction in fresh water flow from upstream and noticeable change in rainfall pattern. Sonneratia apetala is an important tree species for coastal afforestation in Bangladesh. It was hypothesised that S. apetala may show adaptive responses to salinity gradient in terms of morphological and physiological traits. This study examined the adaptive responses of S. apetala growing in three saline zones (less moderate and high) of the Sundarbans in terms of fruit weight and seed germination traits. The fruits of less saline zone was comparatively heavier (9.09 0.08 g) than moderate and high saline zone. The final germination percentage (FGP) germination initiation time (GIT) and germination index (GI) of S. apetala seeds varied significantly (ANOVA p 0.05) among the saline zones and saline treatments. The FGP and GI showed a significant (p 0.05) negative correlation with salinity levels. While GIT showed a significant (p 0.05) positive correlation with salinity treatments. Seeds of moderate and high saline zones germinated faster and vigorously than the seeds of low saline zone at higher salinity levels.

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Abstract

Water and soil salinity of the Sundarbans are increasing due to continuous reduction in fresh water flow from upstream and noticeable change in rainfall pattern. Sonneratia apetala is an important tree species for coastal afforestation in Bangladesh. It was hypothesised that S. apetala may show adaptive responses to salinity gradient in terms of morphological and physiological traits. This study examined the adaptive responses of S. apetala growing in three saline zones (less moderate and high) of the Sundarbans in terms of fruit weight and seed germination traits. The fruits of less saline zone was comparatively heavier (9.09 0.08 g) than moderate and high saline zone. The final germination percentage (FGP) germination initiation time (GIT) and germination index (GI) of S. apetala seeds varied significantly (ANOVA p 0.05) among the saline zones and saline treatments. The FGP and GI showed a significant (p 0.05) negative correlation with salinity levels. While GIT showed a significant (p 0.05) positive correlation with salinity treatments. Seeds of moderate and high saline zones germinated faster and vigorously than the seeds of low saline zone at higher salinity levels.

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Item Type:	Article
AGROVOC Term:	Mangroves
AGROVOC Term:	Sonneratiaceae
AGROVOC Term:	Seed germination
AGROVOC Term:	Salinity
AGROVOC Term:	Saline water
AGROVOC Term:	Phenology
AGROVOC Term:	Germination rate
AGROVOC Term:	Adaptation
AGROVOC Term:	Environmental factors
AGROVOC Term:	Resistance to salinity
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9058

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